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v28.1.0

Kubernetes API Version: v1.28.2

API Change

  • Fixed a bug where CEL expressions in CRD validation rules would incorrectly compute a high estimated cost for functions that return strings, lists or maps. The incorrect cost was evident when the result of a function was used in subsequent operations. (kubernetes/kubernetes#119807, @jpbetz) [SIG API Machinery, Auth and Cloud Provider]
  • Mark Job onPodConditions as optional in pod failure policy (kubernetes/kubernetes#120208, @mimowo) [SIG API Machinery and Apps]

v28.1.0b1

Kubernetes API Version: v1.28.1

v28.1.0a1

Kubernetes API Version: v1.28.1

API Change

  • A CDIDevice field is included in the Device Plugin's ContainerAllocateResponse. This field maps to the CDIDevice field in the CRI protocol. (kubernetes/kubernetes#118254, @elezar) [SIG Node and Testing]
  • ACTION_REQUIRED When an Indexed Job has a number of completions higher than 10^5 and parallelism higher than 10^4, and a big number of Indexes fail, Kubernetes might not be able to track the termination of the Job. Kubernetes now emits a warning, at Job creation, when the Job manifest exceeds both of these limits. (kubernetes/kubernetes#118420, @alculquicondor) [SIG Apps]
  • Added ServedVersions field to StorageVersion API. (kubernetes/kubernetes#118386, @Richabanker)
  • Added IP mode field to loadbalancer status ingress. (kubernetes/kubernetes#118895, @RyanAoh)
  • Added podReplacementPolicy and terminating field to job api. (kubernetes/kubernetes#119301, @kannon92)
  • Added a new namespaceParamRef field to admissionregistration.k8s.io/v1alpha1.ValidatingAdmissionPolicy. (kubernetes/kubernetes#119215, @alexzielenski) [SIG API Machinery and Testing]
  • Added a warning that TLS 1.3 ciphers are not configurable. (kubernetes/kubernetes#115399, @3u13r) [SIG API Machinery and Node]
  • Added error handling for seccomp localhost configurations that do not properly set a localhostProfile. (kubernetes/kubernetes#117020, @cji)
  • Added fields reason and fieldPath into CRD validation rules to allow users to specify reason and field path when validation failed. (kubernetes/kubernetes#118041, @cici37) [SIG API Machinery]
  • Added namespace access support to the CEL expressions of ValidatingAdmissionPolicy via a namespaceObject variable with expressions. (kubernetes/kubernetes#118267, @cici37) [SIG API Machinery and Testing]
  • Added new CRDValidationRatcheting alpha feature. During a PATCH or UPDATE Validation Ratcheting discards errors thrown by unchanged portions of the resource from most OpenAPI schema validations. (kubernetes/kubernetes#118990, @alexzielenski)
  • Added new annotation batch.kubernetes.io/cronjob-scheduled-timestamp to Job objects scheduled from CronJobs. (kubernetes/kubernetes#118137, @helayoty)
  • Added new config option delayCacheUntilActive to KubeSchedulerConfiguration that can provide a tradeoff between memory efficiency and scheduling speed when their leadership is updated in kube-scheduler (kubernetes/kubernetes#115754, @linxiulei) [SIG API Machinery and Scheduling]
  • Changed how KMS v2 encryption at rest can generate data encryption keys. When you enable the KMSv2KDF feature gate (off by default), KMS v2 uses a key derivation function to generate single use data encryption keys from a secret seed combined with some random data. This eliminates the need for a counter based nonce while avoiding nonce collision concerns associated with AES-GCM's 12 byte nonce. (kubernetes/kubernetes#118828, @enj)
  • Exposed rest.DefaultServerUrlFor function. (kubernetes/kubernetes#118055, @timofurrer)
  • Extended the Job API for alpha version of BackoffLimitPerIndex. (kubernetes/kubernetes#119294, @mimowo)
  • Graduated AdmissionWebhookMatchCondition feature to beta. (kubernetes/kubernetes#119380, @a-hilaly)
  • If using cgroups v2, then the cgroup aware OOM killer will be enabled for container cgroups via memory.oom.group . This causes processes within the cgroup to be treated as a unit and killed simultaneously in the event of an OOM kill on any process in the cgroup. (kubernetes/kubernetes#117793, @tzneal) [SIG Apps, Node and Testing]
  • In the API Priority and Fairness feature, priority levels that are exempt from limitation can now be given a nominal and a lendable concurrency and their dispatching borrows from the concurrency limits of the other priority levels. For details see https://github.com/kubernetes/enhancements/tree/master/keps/sig-api-machinery/1040-priority-and-fairness#dispatching . (kubernetes/kubernetes#118782, @MikeSpreitzer) [SIG API Machinery]
  • Indexed Job pods now have the pod completion index set as a pod label. (kubernetes/kubernetes#118883, @danielvegamyhre) [SIG Apps]
  • Kube-proxy: added --logging-format flag to support structured logging. (kubernetes/kubernetes#117800, @cyclinder)
  • NodeVolumeLimits implement the PreFilter extension point for skipping the Filter phase if the Pod doesn't use volumes with limits. (kubernetes/kubernetes#115398, @tangwz) [SIG Scheduling]
  • PersistentVolumes have a new LastPhaseTransitionTime field which holds a timestamp of when the volume last transitioned its phase. (kubernetes/kubernetes#116469, @RomanBednar)
  • Pods which set hostNetwork: true and declare ports, get the hostPort field set automatically. Previously this would happen in the PodTemplate of a Deployment, DaemonSet or other workload API. Now hostPort will only be set when an actual Pod is being created. If this presents a problem, setting the feature gate "DefaultHostNetworkHostPortsInPodTemplates" to true will revert this behavior. Please file a kubernetes bug if you need to do this. (kubernetes/kubernetes#117696, @thockin) [SIG Apps]
  • Promoted API groups ValidatingAdmissionPolicy and ValidatingAdmissionPolicyBinding to v1beta1. (kubernetes/kubernetes#118644, @alexzielenski) [SIG API Machinery, Apps and Testing]
  • Promoted the feature gate ValidtaingAdmissionPolicy to beta, and it is turned off by default. (kubernetes/kubernetes#119409, @alexzielenski)
  • Registered_metric_total, disabled_metric_total, hidden_metric_total & kubernetes_feature_enabled are promoted to BETA stability. (kubernetes/kubernetes#119264, @logicalhan) [SIG API Machinery, Architecture, Cluster Lifecycle and Instrumentation]
  • Removed resizeStatus enum from pvc.Status and replaced with AllocatedResourceStatus. (kubernetes/kubernetes#116335, @gnufied) [SIG API Machinery, Apps, Auth, Node, Storage and Testing]
  • Removed WindowsHostProcessContainers feature-gate. (kubernetes/kubernetes#117570, @marosset) [SIG API Machinery, Apps, Auth, Node and Windows]
  • Revised the comment about the feature-gate level for PodFailurePolicy from alpha to beta. (kubernetes/kubernetes#117802, @kerthcet) [SIG API Machinery and Apps]
  • StatefulSet pods now have the pod index set as a pod label statefulset.kubernetes.io/pod-index. (kubernetes/kubernetes#119232, @danielvegamyhre) [SIG Apps]
  • Support for proxying a request to a peer kube-apiserver if the local apiserver is not able to serve it due to version skew or in the case the requested api is disabled on the local apiserver (kubernetes/kubernetes#117740, @Richabanker) [SIG API Machinery, Apps, Auth, Cloud Provider, Network, Node and Testing]
  • Supported BackoffLimitPerIndex in Jobs. (kubernetes/kubernetes#118009, @mimowo)
  • The IPTablesOwnershipCleanup feature (KEP-3178) is now GA; kubelet no longer creates the KUBE-MARK-DROP chain (which has been unused for several releases) or the KUBE-MARK-MASQ chain (which is now only created by kube-proxy). (kubernetes/kubernetes#119374, @danwinship)
  • The SelfSubjectReview API is promoted to authentication.k8s.io/v1 and the kubectl auth whoami command is GA. (kubernetes/kubernetes#117713, @nabokihms) [SIG API Machinery, Architecture, Auth, CLI and Testing]
  • The names of ResourceClaims generated from ResourceClaimTemplate are now generated. The base name is still <pod>-<claim name>, but a random suffix will avoid name collisions. (kubernetes/kubernetes#117351, @pohly) [SIG API Machinery, Apps, Auth, Node, Scheduling and Testing]
  • The new feature gate "SidecarContainers" is now available. This feature introduces sidecar containers, a new type of init container that starts before other containers but remains running for the full duration of the pod's lifecycle and will not block pod termination. (kubernetes/kubernetes#116429, @gjkim42) [SIG API Machinery, Apps, Node, Scheduling and Testing]
  • Updated the comment about the feature-gate level for PodFailurePolicy from alpha to beta (kubernetes/kubernetes#118278, @mimowo)
  • client-go: Improved memory use of reflector caches when watching large numbers of objects which do not change frequently. (kubernetes/kubernetes#113362, @sxllwx)
  • component-base/logs is now stricter about not applying configurations multiple times and will return an error when that is attempted. Can be overridden by binaries which need to do that. (kubernetes/kubernetes#117108, @pohly)
  • kube-controller-manager: The LegacyServiceAccountTokenCleanUp feature gate is now available as alpha (off by default). When enabled, the legacy-service-account-token-cleaner controller loop removes service account token secrets that have not been used in the time specified by --legacy-service-account-token-clean-up-period (defaulting to one year), and are referenced from the .secrets list of a ServiceAccount object, and are not referenced from pods. (kubernetes/kubernetes#115554, @yt2985)
  • kube-scheduler component config (KubeSchedulerConfiguration) kubescheduler.config.k8s.io/v1beta2 is removed in v1.28. Migrate kube-scheduler configuration files to kubescheduler.config.k8s.io/v1. (kubernetes/kubernetes#117649, @SataQiu)
  • Aggregated discovery now returns responseKind: {} for resources which are missing group/version/kind information, to ensure compatibility with v0.26.0-v0.26.3 clients. (kubernetes/kubernetes#119835, @liggitt) [SIG API Machinery and Testing]
  • Fix CustomResourceDefinition status.storedVersions validation error messages. (kubernetes/kubernetes#119653, @sttts) [SIG API Machinery]
  • Kube-proxy in Kubernetes >= 1.28 up until v1.28.0-beta.0 ignored the -v command line flag when combined with --config. (kubernetes/kubernetes#119867, @pohly) [SIG Network]
  • PersistentVolumes have a new LastPhaseTransitionTime field which holds a timestamp of when the volume last transitioned its phase. (kubernetes/kubernetes#116469, @RomanBednar) [SIG API Machinery, Apps, Auth, Node, Release, Storage and Testing]
  • Promoted API groups ValidatingAdmissionPolicy and ValidatingAdmissionPolicyBinding to v1beta1. (kubernetes/kubernetes#118644, @alexzielenski) [SIG API Machinery, Apps and Testing]
  • Promoted the feature gate ValidtaingAdmissionPolicy to beta and it is turned off by default. (kubernetes/kubernetes#119409, @alexzielenski) [SIG API Machinery, Apps, Auth, Instrumentation, Node, Release, Storage and Testing]
  • Changed how KMS v2 encryption at rest can generate data encryption keys. When you enable the KMSv2KDF feature gate (off by default), KMS v2 uses a key derivation function to generate single use data encryption keys from a secret seed combined with some random data. This eliminates the need for a counter based nonce while avoiding nonce collision concerns associated with AES-GCM's 12 byte nonce. (kubernetes/kubernetes#118828, @enj) [SIG API Machinery, Auth and Testing]
  • A CDIDevice field is includes in the Device Plugin's ContainerAllocateResponse. This field maps to the CDIDevice field in the CRI protocol. (kubernetes/kubernetes#118254, @elezar) [SIG Node and Testing]
  • Add new annotation batch.kubernetes.io/cronjob-scheduled-timestamp to Job objects scheduled from CronJobs. (kubernetes/kubernetes#118137, @helayoty) [SIG Apps]
  • Add podReplacementPolicy and terminating field to job api (kubernetes/kubernetes#119301, @kannon92) [SIG API Machinery and Apps]
  • Added fields reason and fieldPath into CRD validation rules to allow users to specify reason and field path when validation failed. (kubernetes/kubernetes#118041, @cici37) [SIG API Machinery]
  • Added namespace access support to the CEL expressions of ValidatingAdmissionPolicy via a namespaceObject variable with expressions. (kubernetes/kubernetes#118267, @cici37) [SIG API Machinery and Testing]
  • Adds new CRDValidationRatcheting alpha feature. During a PATCH or UPDATE Validation Ratcheting discards errors thrown by unchanged portions of the resource from most OpenAPI schema validations. (kubernetes/kubernetes#118990, @alexzielenski) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node and Storage]
  • Adds new namespaceParamRef to admissionregistration.k8s.io/v1alpha1.ValidatingAdmissionPolicy (kubernetes/kubernetes#119215, @alexzielenski) [SIG API Machinery and Testing]
  • Extend the Job API for alpha version of BackoffLimitPerIndex (kubernetes/kubernetes#119294, @mimowo) [SIG API Machinery and Apps]
  • Graduate AdmissionWebhookMatchCondition feature to beta (kubernetes/kubernetes#119380, @a-hilaly) [SIG API Machinery]
  • In the API Priority and Fairness feature, priority levels that are exempt from limitation can now be given a nominal and a lendable concurrency and their dispatching borrows from the concurrency limits of the other priority levels. For details see https://github.com/kubernetes/enhancements/tree/master/keps/sig-api-machinery/1040-priority-and-fairness#dispatching . (kubernetes/kubernetes#118782, @MikeSpreitzer) [SIG API Machinery]
  • Indexed Job pods now have the pod completion index set as a pod label. (kubernetes/kubernetes#118883, @danielvegamyhre) [SIG Apps]
  • Kube-proxy: add '--logging-format' flag to support structured logging (kubernetes/kubernetes#117800, @cyclinder) [SIG API Machinery, Architecture, Instrumentation and Network]
  • Registered_metric_total, disabled_metric_total, hidden_metric_total & kubernetes_feature_enabled are promoted to BETA stability. (kubernetes/kubernetes#119264, @logicalhan) [SIG API Machinery, Architecture, Cluster Lifecycle and Instrumentation]
  • Removed resizeStatus enum from pvc.Status and replaced with AllocatedResourceStatus (kubernetes/kubernetes#116335, @gnufied) [SIG API Machinery, Apps, Auth, Node, Storage and Testing]
  • StatefulSet pods now have the pod index set as a pod label statefulset.kubernetes.io/pod-index. (kubernetes/kubernetes#119232, @danielvegamyhre) [SIG Apps]
  • Support BackoffLimitPerIndex in Jobs (kubernetes/kubernetes#118009, @mimowo) [SIG API Machinery, Apps and Testing]
  • Support for proxying a request to a peer kube-apiserver if the local apiserver is not able to serve it due to version skew or in the case the requested api is disabled on the local apiserver (kubernetes/kubernetes#117740, @Richabanker) [SIG API Machinery, Apps, Auth, Cloud Provider, Network, Node and Testing]
  • The IPTablesOwnershipCleanup feature (KEP-3178) is now GA; kubelet no longer creates the KUBE-MARK-DROP chain (which has been unused for several releases) or the KUBE-MARK-MASQ chain (which is now only created by kube-proxy). (kubernetes/kubernetes#119374, @danwinship) [SIG API Machinery, Network and Node]
  • The names of ResourceClaims generated from ResourceClaimTemplate are now generated. The base name is still <pod>-<claim name>, but a random suffix will avoid name collisions. (kubernetes/kubernetes#117351, @pohly) [SIG API Machinery, Apps, Auth, Node, Scheduling and Testing]
  • The new feature gate "SidecarContainers" is now available. This feature introduces sidecar containers, a new type of init container that starts before other containers but remains running for the full duration of the pod's lifecycle and will not block pod termination. (kubernetes/kubernetes#116429, @gjkim42) [SIG API Machinery, Apps, Node, Scheduling and Testing]
  • Add ServedVersions field to StorageVersion API (kubernetes/kubernetes#118386, @Richabanker) [SIG API Machinery and Testing]
  • Component-base/logs is now more strict about not applying configurations multiple times and will return an error when that is attempted. Can be overridden by binaries which need to do that. (kubernetes/kubernetes#117108, @pohly) [SIG API Machinery, Architecture, Cloud Provider, Instrumentation, Scheduling and Testing]
  • ACTION_REQUIRED When an Indexed Job has a number of completions higher than 10^5 and parallelism higher than 10^4, and a big number of Indexes fail, Kubernetes might not be able to track the termination of the Job. Kubernetes now emits a warning, at Job creation, when the Job manifest exceeds both of these limits. (kubernetes/kubernetes#118420, @alculquicondor) [SIG Apps]
  • Expose rest.DefaultServerUrlFor function (kubernetes/kubernetes#118055, @timofurrer) [SIG API Machinery]
  • If using cgroups v2, then the cgroup aware OOM killer will be enabled for container cgroups via memory.oom.group . This causes processes within the cgroup to be treated as a unit and killed simultaneously in the event of an OOM kill on any process in the cgroup. (kubernetes/kubernetes#117793, @tzneal) [SIG Apps, Node and Testing]
  • Update the comment about the feature-gate level for PodFailurePolicy from alpha to beta (kubernetes/kubernetes#118278, @mimowo) [SIG Apps]
  • Added a warning that TLS 1.3 ciphers are not configurable. (kubernetes/kubernetes#115399, @3u13r) [SIG API Machinery and Node]
  • Added error handling for seccomp localhost configurations that do not properly set a localhostProfile (kubernetes/kubernetes#117020, @cji) [SIG API Machinery and Node]
  • Added new config option delayCacheUntilActive to KubeSchedulerConfiguration that can provide a tradeoff between memory efficiency and scheduling speed when their leadership is updated in kube-scheduler (kubernetes/kubernetes#115754, @linxiulei) [SIG API Machinery and Scheduling]
  • Client-go: Improved memory use of reflector caches when watching large numbers of objects which do not change frequently (kubernetes/kubernetes#113362, @sxllwx) [SIG API Machinery]
  • Kube-controller-manager: The LegacyServiceAccountTokenCleanUp feature gate is now available as alpha (off by default). When enabled, the legacy-service-account-token-cleaner controller loop removes service account token secrets that have not been used in the time specified by --legacy-service-account-token-clean-up-period (defaulting to one year), and are referenced from the .secrets list of a ServiceAccount object, and are not referenced from pods. (kubernetes/kubernetes#115554, @yt2985) [SIG API Machinery, Apps, Auth, Release and Testing]
  • Kube-scheduler component config (KubeSchedulerConfiguration) kubescheduler.config.k8s.io/v1beta2 is removed in v1.28. Migrate kube-scheduler configuration files to kubescheduler.config.k8s.io/v1. (kubernetes/kubernetes#117649, @SataQiu) [SIG API Machinery, Scheduling and Testing]
  • NodeVolumeLimits implement the PreFilter extension point for skipping the Filter phase if the Pod doesn't use volumes with limits. (kubernetes/kubernetes#115398, @tangwz) [SIG Scheduling]
  • Pods which set hostNetwork: true and declare ports get the hostPort field set automatically. Previously this would happen in the PodTemplate of a Deployment, DaemonSet or other workload API. Now hostPort will only be set when an actual Pod is being created. If this presents a problem, setting the feature gate "DefaultHostNetworkHostPortsInPodTemplates" to true will revert this behavior. Please file a kubernetes bug if you need to do this. (kubernetes/kubernetes#117696, @thockin) [SIG Apps]
  • Removing WindowsHostProcessContainers feature-gate (kubernetes/kubernetes#117570, @marosset) [SIG API Machinery, Apps, Auth, Node and Windows]
  • Revised the comment about the feature-gate level for PodFailurePolicy from alpha to beta (kubernetes/kubernetes#117802, @kerthcet) [SIG API Machinery and Apps]
  • The SelfSubjectReview API is promoted to authentication.k8s.io/v1 and the kubectl auth whoami command is GA. (kubernetes/kubernetes#117713, @nabokihms) [SIG API Machinery, Architecture, Auth, CLI and Testing]

v27.2.0

Kubernetes API Version: v1.27.3

Documentation

  • Fix request_timeout example and doc. Arg name should be _request_timeout. Single value type should be int or long. (#2071, @hemslo)

v27.2.0b1

Kubernetes API Version: v1.27.2

v27.2.0a1

Kubernetes API Version: v1.27.2

API Change

  • Added error handling for seccomp localhost configurations that do not properly set a localhostProfile (kubernetes/kubernetes#117020, @cji) [SIG API Machinery and Node]

  • Fixed an issue where kubelet does not set case-insensitive headers for http probes. (#117182, @dddddai) (kubernetes/kubernetes#117324, @dddddai) [SIG API Machinery, Apps and Node]

  • Revised the comment about the feature-gate level for PodFailurePolicy from alpha to beta (kubernetes/kubernetes#117815, @kerthcet) [SIG Apps]

  • A fix in the resource.k8s.io/v1alpha1/ResourceClaim API avoids harmless (?) ".status.reservedFor: element 0: associative list without keys has an element that's a map type" errors in the apiserver. Validation now rejects the incorrect reuse of the same UID in different entries. (kubernetes/kubernetes#115354, @pohly)

  • A terminating pod on a node that is not caused by preemption no longer prevents kube-scheduler from preempting pods on that node

  • API: resource.k8s.io/v1alpha1.PodScheduling was renamed to resource.k8s.io/v1alpha2.PodSchedulingContext. (kubernetes/kubernetes#116556, @pohly) [SIG API Machinery, Apps, Auth, CLI, Node, Scheduling and Testing]

  • Added CEL runtime cost calculation into ValidatingAdmissionPolicy, matching the evaluation cost restrictions that already apply to CustomResourceDefinition. If rule evaluation uses more compute than the limit, the API server aborts the evaluation and the admission check that was being performed is aborted; the failurePolicy for the ValidatingAdmissionPolicy determines the outcome. (kubernetes/kubernetes#115747, @cici37)

  • Added auditAnnotations to ValidatingAdmissionPolicy, enabling CEL to be used to add audit annotations to request audit events. Added validationActions to ValidatingAdmissionPolicyBinding, enabling validation failures to be handled by any combination of the warn, audit and deny enforcement actions. (kubernetes/kubernetes#115973, @jpbetz)

  • Added messageExpression field to ValidationRule. (kubernetes/kubernetes#115969, @DangerOnTheRanger)

  • Added messageExpression to ValidatingAdmissionPolicy, to set custom failure message via CEL expression. (kubernetes/kubernetes#116397, @jiahuif) [SIG API Machinery]

  • Added a new IPAddress object kind

    • Added a new ClusterIP allocator. The new allocator removes previous Service CIDR block size limitations for IPv4, and limits IPv6 size to a /64 (kubernetes/kubernetes#115075, @aojea) [SIG API Machinery, Apps, Auth, CLI, Cluster Lifecycle, Network and Testing]

  • Added a new alpha API: ClusterTrustBundle (certificates.k8s.io/v1alpha1). A ClusterTrustBundle may be used to distribute X.509 trust anchors to workloads within the cluster. (kubernetes/kubernetes#113218, @ahmedtd) [SIG API Machinery, Auth and Testing]

  • Added authorization check support to the CEL expressions of ValidatingAdmissionPolicy via a authorizer variable with expressions. The new variable provides a builder that allows expressions such authorizer.group('').resource('pods').check('create').allowed(). (kubernetes/kubernetes#116054, @jpbetz) [SIG API Machinery and Testing]

  • Added matchConditions field to ValidatingAdmissionPolicy and enabled support for CEL based custom match criteria. (kubernetes/kubernetes#116350, @maxsmythe)

  • Added new option to the InterPodAffinity scheduler plugin to ignore existing podspreferred inter-pod affinities if the incoming pod has no preferred inter-pod affinities. This option can be used as an optimization for higher scheduling throughput (at the cost of an occasional pod being scheduled non-optimally/violating existing pods preferred inter-pod affinities). To enable this scheduler option, set theInterPodAffinityscheduler plugin argignorePreferredTermsOfExistingPods: true` (kubernetes/kubernetes#114393, @danielvegamyhre)

  • Added the MatchConditions field to ValidatingWebhookConfiguration and MutatingWebhookConfiguration for the v1beta and v1 apis.

    The AdmissionWebhookMatchConditions featuregate is now in Alpha (kubernetes/kubernetes#116261, @ivelichkovich) [SIG API Machinery and Testing]

  • Added validation to ensure that if service.kubernetes.io/topology-aware-hints and service.kubernetes.io/topology-mode annotations are both set, they are set to the same value.Also Added deprecation warning if service.kubernetes.io/topology-aware-hints annotation is used. (kubernetes/kubernetes#116612, @robscott)

  • Added warnings about workload resources (Pods, ReplicaSets, Deployments, Jobs, CronJobs, or ReplicationControllers) whose names are not valid DNS labels. (kubernetes/kubernetes#114412, @thockin)

  • Adds feature gate NodeLogQuery which provides cluster administrators with a streaming view of logs using kubectl without them having to implement a client side reader or logging into the node. (kubernetes/kubernetes#96120, @LorbusChris)

  • Api: validation of a PodSpec now rejects invalid ResourceClaim and ResourceClaimTemplate names. For a pod, the name generated for the ResourceClaim when using a template also must be valid. (kubernetes/kubernetes#116576, @pohly)

  • Bump default API QPS limits for Kubelet. (kubernetes/kubernetes#116121, @wojtek-t)

  • Enabled the StatefulSetStartOrdinal feature gate in beta (kubernetes/kubernetes#115260, @pwschuurman)

  • Enabled usage of kube-proxy, kube-scheduler and kubelet HTTP APIs for changing the logging verbosity at runtime for JSON output. (kubernetes/kubernetes#114609, @pohly)

  • Encryption of API Server at rest configuration now allows the use of wildcards in the list of resources. For example, . can be used to encrypt all resources, including all current and future custom resources. (kubernetes/kubernetes#115149, @nilekhc)

  • Extended the kubelet's PodResources API to include resources allocated in ResourceClaims via DynamicResourceAllocation. Additionally, added a new Get() method to query a specific pod for its resources. (kubernetes/kubernetes#115847, @moshe010) [SIG Node]

  • Forbid to set matchLabelKeys when labelSelector is not set in topologySpreadConstraints (kubernetes/kubernetes#116535, @denkensk)

  • GCE does not support LoadBalancer Services with ports with different protocols (TCP and UDP) (kubernetes/kubernetes#115966, @aojea) [SIG Apps and Cloud Provider]

  • GRPC probes are now a GA feature. GRPCContainerProbe feature gate was locked to default value and will be removed in v1.29. If you were setting this feature gate explicitly, please remove it now. (kubernetes/kubernetes#116233, @SergeyKanzhelev)

  • Graduated Kubelet Topology Manager to GA. (kubernetes/kubernetes#116093, @swatisehgal)

  • Graduated KubeletTracing to beta, which means that the feature gate is now enabled by default. (kubernetes/kubernetes#115750, @saschagrunert)

  • Graduated seccomp profile defaulting to GA.

    Set the kubelet --seccomp-default flag or seccompDefault kubelet configuration field to true to make pods on that node default to using the RuntimeDefault seccomp profile.

    Enabling seccomp for your workload can have a negative performance impact depending on the kernel and container runtime version in use.

    Guidance for identifying and mitigating those issues is outlined in the Kubernetes seccomp tutorial. (kubernetes/kubernetes#115719, @saschagrunert) [SIG API Machinery, Node, Storage and Testing]

  • Graduated the container resource metrics feature on HPA to beta. (kubernetes/kubernetes#116046, @sanposhiho)

  • Implemented API streaming for the watch-cache

    When sendInitialEvents ListOption is set together with watch=true, it begins the watch stream with synthetic init events followed by a synthetic "Bookmark" after which the server continues streaming events. (kubernetes/kubernetes#110960, @p0lyn0mial)

  • Introduced API for streaming.

    Added SendInitialEvents field to the ListOptions. When the new option is set together with watch=true, it begins the watch stream with synthetic init events followed by a synthetic "Bookmark" after which the server continues streaming events. (kubernetes/kubernetes#115402, @p0lyn0mial)

  • Introduced a breaking change to the resource.k8s.io API in its AllocationResult struct. This change allows a kubelet plugin for the DynamicResourceAllocation feature to service allocations from multiple resource driver controllers. (kubernetes/kubernetes#116332, @klueska)

  • Introduces new alpha functionality to the reflector, allowing user to enable API streaming.

    To activate this feature, users can set the ENABLE_CLIENT_GO_WATCH_LIST_ALPHA environmental variable. It is important to note that the server must support streaming for this feature to function properly. If streaming is not supported by the server, the reflector will revert to the previous method of obtaining data through LIST/WATCH semantics. (kubernetes/kubernetes#110772, @p0lyn0mial) [SIG API Machinery]

  • K8s.io/client-go/tools/record.EventBroadcaster: after Shutdown() is called, the broadcaster now gives up immediately after a failure to write an event to a sink. Previously it tried multiple times for 12 seconds in a goroutine. (kubernetes/kubernetes#115514, @pohly) [SIG API Machinery]

  • K8s.io/component-base/logs: usage of the pflag values in a normal Go flag set led to panics when printing the help message (kubernetes/kubernetes#114680, @pohly) [SIG Instrumentation]

  • Kubeadm: explicitly set priority for static pods with priorityClassName: system-node-critical (kubernetes/kubernetes#114338, @champtar) [SIG Cluster Lifecycle]

  • Kubelet: a "maxParallelImagePulls" field can now be specified in the kubelet configuration file to control how many image pulls the kubelet can perform in parallel. (kubernetes/kubernetes#115220, @ruiwen-zhao) [SIG API Machinery, Node and Scalability]

  • Kubelet: changed MemoryThrottlingFactor default value to 0.9 and formulas to calculate memory.high (kubernetes/kubernetes#115371, @pacoxu)

  • Kubernetes components that perform leader election now only support using Leases for this. (kubernetes/kubernetes#114055, @aimuz)

  • Migrated the DaemonSet controller (within kube-controller-manager) to use contextual logging (kubernetes/kubernetes#113622, @249043822)

  • New service.kubernetes.io/topology-mode annotation has been introduced as a replacement for the service.kubernetes.io/topology-aware-hints annotation.

    • service.kubernetes.io/topology-aware-hints annotation has been deprecated.
    • kube-proxy now accepts any value that is not "disabled" for these annotations, enabling custom implementation-specific and/or future built-in heuristics to be used. (kubernetes/kubernetes#116522, @robscott) [SIG Apps, Network and Testing]

  • Pods owned by a Job now uses the labels batch.kubernetes.io/job-name and batch.kubernetes.io/controller-uid. The legacy labels job-name and controller-uid are still added for compatibility. (kubernetes/kubernetes#114930, @kannon92)

  • Promoted CronJobTimeZone feature to GA (kubernetes/kubernetes#115904, @soltysh)

  • Promoted SelfSubjectReview to Beta (kubernetes/kubernetes#116274, @nabokihms) [SIG API Machinery, Auth, CLI and Testing]

  • Relaxed API validation to allow pod node selector to be mutable for gated pods (additions only, no deletions or mutations). (kubernetes/kubernetes#116161, @danielvegamyhre)

  • Remove kubernetes.io/grpc standard appProtocol (kubernetes/kubernetes#116866, @LiorLieberman) [SIG API Machinery and Apps]

  • Remove deprecated --enable-taint-manager and --pod-eviction-timeout CLI (kubernetes/kubernetes#115840, @atosatto)

  • Removed support for the v1alpha1 kubeletplugin API of DynamicResourceManagement. All plugins must be updated to v1alpha2 in order to function properly. (kubernetes/kubernetes#116558, @klueska)

  • The API server now re-uses data encryption keys while the kms v2 plugin key ID is stable. Data encryption keys are still randomly generated on server start but an atomic counter is used to prevent nonce collisions. (kubernetes/kubernetes#116155, @enj)

  • The PodDisruptionBudget spec.unhealthyPodEvictionPolicy field has graduated to beta and is enabled by default. On servers with the feature enabled, this field may be set to AlwaysAllow to always allow unhealthy pods covered by the PodDisruptionBudget to be evicted. (kubernetes/kubernetes#115363, @ravisantoshgudimetla) [SIG Apps, Auth and Node]

  • The DownwardAPIHugePages kubelet feature graduated to stable / GA. (kubernetes/kubernetes#115721, @saschagrunert) [SIG Apps and Node]

  • The following feature gates for volume expansion GA features have now been removed and must no longer be referenced in --feature-gates flags: ExpandCSIVolumes, ExpandInUsePersistentVolumes, ExpandPersistentVolumes (kubernetes/kubernetes#113942, @mengjiao-liu)

  • The list-type of the alpha resourceClaims field introduced to Pods in 1.26.0 was modified from set to map, resolving an incompatibility with use of this schema in CustomResourceDefinitions and with server-side apply. (kubernetes/kubernetes#114585, @JoelSpeed)

  • Updated API reference for Requests, specifying they must not exceed limits (kubernetes/kubernetes#115434, @ehashman)

  • Updated KMSv2 to beta (kubernetes/kubernetes#115123, @aramase)

  • Updated: Redefine AppProtocol field description and add new standard values (kubernetes/kubernetes#115433, @LiorLieberman) [SIG API Machinery, Apps and Network]

  • /metrics/slis is now available for control plane components allowing you to scrape health check metrics. (kubernetes/kubernetes#114997, @Richabanker)

  • APIServerTracing feature gate is now enabled by default. Tracing in the API Server is still disabled by default, and requires a config file to enable. (kubernetes/kubernetes#116144, @dashpole)

  • NodeResourceFit and NodeResourcesBalancedAllocation implement the PreScore extension point for a more performant calculation. (kubernetes/kubernetes#115655, @tangwz)

  • PodSchedulingReadiness is graduated to beta. (kubernetes/kubernetes#115815, @Huang-Wei)

  • PodSpec.Container.Resources became mutable for CPU and memory resource types.

    • PodSpec.Container.ResizePolicy (new object) gives users control over how their containers are resized.
    • PodStatus.Resize status describes the state of a requested Pod resize.
    • PodStatus.ResourcesAllocated describes node resources allocated to Pod.
    • PodStatus.Resources describes node resources applied to running containers by CRI.
    • UpdateContainerResources CRI API now supports both Linux and Windows. (kubernetes/kubernetes#102884, @vinaykul)

  • SELinuxMountReadWriteOncePod graduated to Beta. (kubernetes/kubernetes#116425, @jsafrane)

  • StatefulSetAutoDeletePVC feature gate promoted to beta. (kubernetes/kubernetes#116501, @mattcary)

  • StatefulSet names must be DNS labels, rather than subdomains. Any StatefulSet which took advantage of subdomain validation (by having dots in the name) can't possibly have worked, because we eventually set pod.spec.hostname from the StatefulSetName, and that is validated as a DNS label. (kubernetes/kubernetes#114172, @thockin)

  • ValidatingAdmissionPolicy now provides a status field that contains results of type checking the validation expression. The type checking is fully informational, and the behavior of the policy is unchanged. (kubernetes/kubernetes#115668, @jiahuif)

  • cacheSize field in EncryptionConfiguration is not supported for KMSv2 provider (kubernetes/kubernetes#113121, @aramase)

  • k8s.io/component-base/logs now also supports adding command line flags to a flag.FlagSet. (kubernetes/kubernetes#114731, @pohly)

  • kubelet: migrated --container-runtime-endpoint and --image-service-endpoint to kubelet config (kubernetes/kubernetes#112136, @pacoxu)

  • resource.k8s.io/v1alpha1 was replaced with resource.k8s.io/v1alpha2. Before upgrading a cluster, all objects in resource.k8s.io/v1alpha1 (ResourceClaim, ResourceClaimTemplate, ResourceClass, PodScheduling) must be deleted. The changes are internal, so YAML files which create pods and resource claims don't need changes except for the newer apiVersion. (kubernetes/kubernetes#116299, @pohly)

  • volumes: resource.claims is now cleared for PVC specs during create or update of a pod spec with inline PVC template or of a PVC because it has no effect. (kubernetes/kubernetes#115928, @pohly)

  • Added a new alpha API: ClusterTrustBundle (certificates.k8s.io/v1alpha1). A ClusterTrustBundle may be used to distribute X.509 trust anchors to workloads within the cluster. (kubernetes/kubernetes#113218, @ahmedtd) [SIG API Machinery, Auth and Testing]

  • Remove kubernetes.io/grpc standard appProtocol (kubernetes/kubernetes#116866, @LiorLieberman) [SIG API Machinery and Apps]

  • API: resource.k8s.io/v1alpha1.PodScheduling was renamed to resource.k8s.io/v1alpha2.PodSchedulingContext. (kubernetes/kubernetes#116556, @pohly) [SIG API Machinery, Apps, Auth, CLI, Node, Scheduling and Testing]

  • APIServerTracing feature gate is now enabled by default. Tracing in the API Server is still disabled by default, and requires a config file to enable. (kubernetes/kubernetes#116144, @dashpole) [SIG API Machinery and Testing]

  • Added CEL runtime cost calculation into ValidatingAdmissionPolicy, matching the evaluation cost restrictions that already apply to CustomResourceDefinition. If rule evaluation uses more compute than the limit, the API server aborts the evaluation and the admission check that was being performed is aborted; the failurePolicy for the ValidatingAdmissionPolicy determines the outcome. (kubernetes/kubernetes#115747, @cici37) [SIG API Machinery]

  • Added messageExpression to ValidatingAdmissionPolicy, to set custom failure message via CEL expression. (kubernetes/kubernetes#116397, @jiahuif) [SIG API Machinery]

  • Added a new IPAddress object kind

    • Added a new ClusterIP allocator. The new allocator removes previous Service CIDR block size limitations for IPv4, and limits IPv6 size to a /64 (kubernetes/kubernetes#115075, @aojea) [SIG API Machinery, Apps, Auth, CLI, Cluster Lifecycle, Network and Testing]

  • Added a new alpha API: ClusterTrustBundle (certificates.k8s.io/v1alpha1). A ClusterTrustBundle may be used to distribute X.509 trust anchors to workloads within the cluster. (kubernetes/kubernetes#113218, @ahmedtd) [SIG API Machinery, Auth and Testing]

  • Added authorization check support to the CEL expressions of ValidatingAdmissionPolicy via a authorizer variable with expressions. The new variable provides a builder that allows expressions such authorizer.group('').resource('pods').check('create').allowed(). (kubernetes/kubernetes#116054, @jpbetz) [SIG API Machinery and Testing]

  • Added matchConditions field to ValidatingAdmissionPolicy, enabled support for CEL based custom match criteria. (kubernetes/kubernetes#116350, @maxsmythe) [SIG API Machinery and Testing]

  • Added messageExpression field to ValidationRule. (#115969, @DangerOnTheRanger) (kubernetes/kubernetes#115969, @DangerOnTheRanger) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Instrumentation, Node and Testing]

  • Added the MatchConditions field to ValidatingWebhookConfiguration and MutatingWebhookConfiguration for the v1beta and v1 apis.

    The AdmissionWebhookMatchConditions featuregate is now in Alpha (kubernetes/kubernetes#116261, @ivelichkovich) [SIG API Machinery and Testing]

  • Added validation to ensure that if service.kubernetes.io/topology-aware-hints and service.kubernetes.io/topology-mode annotations are both set, they are set to the same value.

  • Adds auditAnnotations to ValidatingAdmissionPolicy, enabling CEL to be used to add audit annotations to request audit events. Adds validationActions to ValidatingAdmissionPolicyBinding, enabling validation failures to be handled by any combination of the warn, audit and deny enforcement actions. (kubernetes/kubernetes#115973, @jpbetz) [SIG API Machinery and Testing]

  • Adds feature gate NodeLogQuery which provides cluster administrators with a streaming view of logs using kubectl without them having to implement a client side reader or logging into the node. (kubernetes/kubernetes#96120, @LorbusChris) [SIG API Machinery, Apps, CLI, Node, Testing and Windows]

  • Api: validation of a PodSpec now rejects invalid ResourceClaim and ResourceClaimTemplate names. For a pod, the name generated for the ResourceClaim when using a template also must be valid. (kubernetes/kubernetes#116576, @pohly) [SIG Apps]

  • Bump default API QPS limits for Kubelet. (kubernetes/kubernetes#116121, @wojtek-t) [SIG API Machinery and Node]

  • Enable the "StatefulSetStartOrdinal" feature gate in beta (kubernetes/kubernetes#115260, @pwschuurman) [SIG API Machinery and Apps]

  • Extended the kubelet's PodResources API to include resources allocated in ResourceClaims via DynamicResourceAllocation. Additionally, added a new Get() method to query a specific pod for its resources. (kubernetes/kubernetes#115847, @moshe010) [SIG Node]

  • Forbid to set matchLabelKeys when labelSelector isn’t set in topologySpreadConstraints (kubernetes/kubernetes#116535, @denkensk) [SIG API Machinery, Apps and Scheduling]

  • GCE does not support LoadBalancer Services with ports with different protocols (TCP and UDP) (kubernetes/kubernetes#115966, @aojea) [SIG Apps and Cloud Provider]

  • GRPC probes are now a GA feature. GRPCContainerProbe feature gate was locked to default value and will be removed in v1.29. If you were setting this feature gate explicitly, please remove it now. (kubernetes/kubernetes#116233, @SergeyKanzhelev) [SIG API Machinery, Apps and Node]

  • Graduate Kubelet Topology Manager to GA. (kubernetes/kubernetes#116093, @swatisehgal) [SIG API Machinery, Node and Testing]

  • Graduate KubeletTracing to beta, which means that the feature gate is now enabled by default. (kubernetes/kubernetes#115750, @saschagrunert) [SIG Instrumentation and Node]

  • Graduate the container resource metrics feature on HPA to beta. (kubernetes/kubernetes#116046, @sanposhiho) [SIG Autoscaling]

  • Introduced a breaking change to the resource.k8s.io API in its AllocationResult struct. This change allows a kubelet plugin for the DynamicResourceAllocation feature to service allocations from multiple resource driver controllers. (kubernetes/kubernetes#116332, @klueska) [SIG API Machinery, Apps, CLI, Node, Scheduling and Testing]

  • Introduces new alpha functionality to the reflector, allowing user to enable API streaming.

    To activate this feature, users can set the ENABLE_CLIENT_GO_WATCH_LIST_ALPHA environmental variable. It is important to note that the server must support streaming for this feature to function properly. If streaming is not supported by the server, the reflector will revert to the previous method of obtaining data through LIST/WATCH semantics. (kubernetes/kubernetes#110772, @p0lyn0mial) [SIG API Machinery]

  • Kubelet: change MemoryThrottlingFactor default value to 0.9 and formulas to calculate memory.high (kubernetes/kubernetes#115371, @pacoxu) [SIG API Machinery, Apps and Node]

  • Migrated the DaemonSet controller (within `kube-controller-manager) to use contextual logging (kubernetes/kubernetes#113622, @249043822) [SIG API Machinery, Apps, Instrumentation and Testing]

  • New service.kubernetes.io/topology-mode annotation has been introduced as a replacement for the service.kubernetes.io/topology-aware-hints annotation.

    • service.kubernetes.io/topology-aware-hints annotation has been deprecated.
    • kube-proxy now accepts any value that is not "disabled" for these annotations, enabling custom implementation-specific and/or future built-in heuristics to be used. (kubernetes/kubernetes#116522, @robscott) [SIG Apps, Network and Testing]

  • NodeResourceFit and NodeResourcesBalancedAllocation implement the PreScore extension point for a more performant calculation. (kubernetes/kubernetes#115655, @tangwz) [SIG Scheduling]

  • Pods owned by a Job will now use the labels batch.kubernetes.io/job-name and batch.kubernetes.io/controller-uid. The legacy labels job-name and controller-uid are still added for compatibility. (kubernetes/kubernetes#114930, @kannon92) [SIG Apps]

  • Promote CronJobTimeZone feature to GA (kubernetes/kubernetes#115904, @soltysh) [SIG API Machinery and Apps]

  • Promoted SelfSubjectReview to Beta (kubernetes/kubernetes#116274, @nabokihms) [SIG API Machinery, Auth, CLI and Testing]

  • Relax API validation to allow pod node selector to be mutable for gated pods (additions only, no deletions or mutations). (kubernetes/kubernetes#116161, @danielvegamyhre) [SIG Apps, Scheduling and Testing]

  • Remove deprecated --enable-taint-manager and --pod-eviction-timeout CLI flags (kubernetes/kubernetes#115840, @atosatto) [SIG API Machinery, Apps, Node and Testing]

  • Resource.k8s.io/v1alpha1 was replaced with resource.k8s.io/v1alpha2. Before upgrading a cluster, all objects in resource.k8s.io/v1alpha1 (ResourceClaim, ResourceClaimTemplate, ResourceClass, PodScheduling) must be deleted. The changes will be internal, so YAML files which create pods and resource claims don't need changes except for the newer apiVersion. (kubernetes/kubernetes#116299, @pohly) [SIG API Machinery, Apps, CLI, Node, Scheduling and Testing]

  • SELinuxMountReadWriteOncePod graduated to Beta. (kubernetes/kubernetes#116425, @jsafrane) [SIG Storage and Testing]

  • StatefulSetAutoDeletePVC feature gate promoted to beta. (kubernetes/kubernetes#116501, @mattcary) [SIG Apps, Auth and Testing]

  • The API server now re-uses data encryption keys while the kms v2 plugin's key ID is stable. Data encryption keys are still randomly generated on server start but an atomic counter is used to prevent nonce collisions. (kubernetes/kubernetes#116155, @enj) [SIG API Machinery, Auth and Testing]

  • The API server's encryption at rest configuration now allows the use of wildcards in the list of resources. For example, '.' can be used to encrypt all resources, including all current and future custom resources. (kubernetes/kubernetes#115149, @nilekhc) [SIG API Machinery, Auth and Testing]

  • Update KMSv2 to beta (kubernetes/kubernetes#115123, @aramase) [SIG API Machinery, Auth and Testing]

  • Updated: Redefine AppProtocol field description and add new standard values (kubernetes/kubernetes#115433, @LiorLieberman) [SIG API Machinery, Apps and Network]

  • ValidatingAdmissionPolicy now provides a status field that contains results of type checking the validation expression. The type checking is fully informational, and the behavior of the policy is unchanged. (kubernetes/kubernetes#115668, @jiahuif) [SIG API Machinery, Auth, Cloud Provider and Testing]

  • We have removed support for the v1alpha1 kubeletplugin API of DynamicResourceManagement. All plugins must update to v1alpha2 in order to function properly going forward. (kubernetes/kubernetes#116558, @klueska) [SIG API Machinery, Apps, CLI, Node, Scheduling and Testing]

  • Graduated seccomp profile defaulting to GA.

    Set the kubelet --seccomp-default flag or seccompDefault kubelet configuration field to true to make pods on that node default to using the RuntimeDefault seccomp profile.

    Enabling seccomp for your workload can have a negative performance impact depending on the kernel and container runtime version in use.

    Guidance for identifying and mitigating those issues is outlined in the Kubernetes seccomp tutorial. (kubernetes/kubernetes#115719, @saschagrunert) [SIG API Machinery, Node, Storage and Testing]

  • Implements API for streaming for the watch-cache

    When sendInitialEvents ListOption is set together with watch=true, it begins the watch stream with synthetic init events followed by a synthetic "Bookmark" after which the server continues streaming events. (kubernetes/kubernetes#110960, @p0lyn0mial) [SIG API Machinery]

  • Introduce API for streaming.

    Add SendInitialEvents field to the ListOptions. When the new option is set together with watch=true, it begins the watch stream with synthetic init events followed by a synthetic "Bookmark" after which the server continues streaming events. (kubernetes/kubernetes#115402, @p0lyn0mial) [SIG API Machinery]

  • Kubelet: a "maxParallelImagePulls" field can now be specified in the kubelet configuration file to control how many image pulls the kubelet can perform in parallel. (kubernetes/kubernetes#115220, @ruiwen-zhao) [SIG API Machinery, Node and Scalability]

  • PodSchedulingReadiness is graduated to beta. (kubernetes/kubernetes#115815, @Huang-Wei) [SIG API Machinery, Apps, Scheduling and Testing]

  • In-place resize feature for Kubernetes Pods

    • Changed the Pod API so that the resources defined for containers are mutable for cpu and memory resource types.
    • Added resizePolicy for containers in a pod to allow users control over how their containers are resized.
    • Added allocatedResources field to container status in pod status that describes the node resources allocated to a pod.
    • Added resources field to container status that reports actual resources applied to running containers.
    • Added resize field to pod status that describes the state of a requested pod resize. For details, see KEPs below. (kubernetes/kubernetes#102884, @vinaykul) [SIG API Machinery, Apps, Instrumentation, Node, Scheduling and Testing]

  • The PodDisruptionBudget spec.unhealthyPodEvictionPolicy field has graduated to beta and is enabled by default. On servers with the feature enabled, this field may be set to AlwaysAllow to always allow unhealthy pods covered by the PodDisruptionBudget to be evicted. (kubernetes/kubernetes#115363, @ravisantoshgudimetla) [SIG Apps, Auth and Node]

  • The DownwardAPIHugePages kubelet feature graduated to stable / GA. (kubernetes/kubernetes#115721, @saschagrunert) [SIG Apps and Node]

  • Volumes: resource.claims gets cleared for PVC specs during create or update of a pod spec with inline PVC template or of a PVC because it has no effect. (kubernetes/kubernetes#115928, @pohly) [SIG API Machinery, Apps and Storage]

  • A fix in the resource.k8s.io/v1alpha1/ResourceClaim API avoids harmless (?) ".status.reservedFor: element 0: associative list without keys has an element that's a map type" errors in the apiserver. Validation now rejects the incorrect reuse of the same UID in different entries. (kubernetes/kubernetes#115354, @pohly) [SIG API Machinery]

  • CacheSize field in EncryptionConfiguration is not supported for KMSv2 provider (kubernetes/kubernetes#113121, @aramase) [SIG API Machinery, Auth and Testing]

  • K8s.io/client-go/tools/record.EventBroadcaster: after Shutdown() is called, the broadcaster now gives up immediately after a failure to write an event to a sink. Previously it tried multiple times for 12 seconds in a goroutine. (kubernetes/kubernetes#115514, @pohly) [SIG API Machinery]

  • K8s.io/component-base/logs now also supports adding command line flags to a flag.FlagSet. (kubernetes/kubernetes#114731, @pohly) [SIG Architecture]

  • Update API reference for Requests, specifying they must not exceed limits (kubernetes/kubernetes#115434, @ehashman) [SIG Architecture, Docs and Node]

  • /metrics/slis is made available for control plane components allowing you to scrape health check metrics. (kubernetes/kubernetes#114997, @Richabanker) [SIG API Machinery, Apps, Architecture, Auth, Autoscaling, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Release, Scheduling, Storage and Testing]

  • A terminating pod on a node that is not caused by preemption won't prevent kube-scheduler from preempting pods on that node

  • Added new option to the InterPodAffinity scheduler plugin to ignore existing pods` preferred inter-pod affinities if the incoming pod has no preferred inter-pod affinities. This option can be used as an optimization for higher scheduling throughput (at the cost of an occasional pod being scheduled non-optimally/violating existing pods' preferred inter-pod affinities). To enable this scheduler option, set the InterPodAffinity scheduler plugin arg "ignorePreferredTermsOfExistingPods: true". (kubernetes/kubernetes#114393, @danielvegamyhre) [SIG API Machinery and Scheduling]

  • Added warnings about workload resources (Pods, ReplicaSets, Deployments, Jobs, CronJobs, or ReplicationControllers) whose names are not valid DNS labels. (kubernetes/kubernetes#114412, @thockin) [SIG API Machinery and Apps]

  • K8s.io/component-base/logs: usage of the pflag values in a normal Go flag set led to panics when printing the help message (kubernetes/kubernetes#114680, @pohly) [SIG Instrumentation]

  • Kube-proxy, kube-scheduler and kubelet have HTTP APIs for changing the logging verbosity at runtime. This now also works for JSON output. (kubernetes/kubernetes#114609, @pohly) [SIG API Machinery, Architecture, Cloud Provider, Instrumentation and Testing]

  • Kubeadm: explicitly set priority for static pods with priorityClassName: system-node-critical (kubernetes/kubernetes#114338, @champtar) [SIG Cluster Lifecycle]

  • Kubelet: migrate "--container-runtime-endpoint" and "--image-service-endpoint" to kubelet config (kubernetes/kubernetes#112136, @pacoxu) [SIG API Machinery, Node and Scalability]

  • Kubernetes components that perform leader election now only support using Leases for this. (kubernetes/kubernetes#114055, @aimuz) [SIG API Machinery, Cloud Provider and Scheduling]

  • StatefulSet names must be DNS labels, rather than subdomains. Any StatefulSet which took advantage of subdomain validation (by having dots in the name) can't possibly have worked, because we eventually set pod.spec.hostname from the StatefulSetName, and that is validated as a DNS label. (kubernetes/kubernetes#114172, @thockin) [SIG Apps]

  • The following feature gates for volume expansion GA features have been removed and must no longer be referenced in --feature-gates flags: ExpandCSIVolumes, ExpandInUsePersistentVolumes, ExpandPersistentVolumes (kubernetes/kubernetes#113942, @mengjiao-liu) [SIG API Machinery, Apps and Testing]

  • The list-type of the alpha resourceClaims field introduced to Pods in 1.26.0 was modified from "set" to "map", resolving an incompatibility with use of this schema in CustomResourceDefinitions and with server-side apply. (kubernetes/kubernetes#114585, @JoelSpeed) [SIG API Machinery]

v26.1.0

Kubernetes API Version: v1.26.1

Bug or Regression

  • The timeout unit of the WSClient update method is now always seconds for both poll and select functions. (#1976, @t-yrka)

Feature

  • Adds support for loading CA certificates from a file using the idp-certificate-authority key for the oidc plugin. (#1916, @vgupta3)

v26.1.0b1

Kubernetes API Version: v1.26.1

Bug or Regression

  • The timeout unit of the WSClient update method is now always seconds for both poll and select functions. (#1976, @t-yrka)

Feature

  • Adds support for loading CA certificates from a file using the idp-certificate-authority key for the oidc plugin. (#1916, @vgupta3)

v26.1.0a1

Kubernetes API Version: v1.26.1

API Change

  • The list-type of the alpha resourceClaims field introduced to Pods in 1.26.0 was modified from "set" to "map", resolving an incompatibility with use of this schema in CustomResourceDefinitions and with server-side apply. (kubernetes/kubernetes#114617, @JoelSpeed) [SIG API Machinery]

  • 'A new preEnqueue extension point was added to scheduler's component config v1beta2/v1beta3/v1.' (kubernetes/kubernetes#113275, @Huang-Wei)

  • 'Added a ResourceClaim API (in the resource.k8s.io/v1alpha1 API group and behind the DynamicResourceAllocation feature gate). The new API is now more flexible than the existing Device Plugins feature of Kubernetes because it allows Pods to request (claim) special kinds of resources, which can be available at node level, cluster level, or following any other model you implement.' (kubernetes/kubernetes#111023, @pohly)

  • 'Container preStop and postStart lifecycle handlers using httpGet now honor the specified scheme and headers fields. This enables setting custom headers and changing the scheme to HTTPS, consistent with container startup/readiness/liveness probe capabilities. Lifecycle handlers configured with scheme: HTTPS that encounter errors indicating the endpoint is actually using HTTP fall back to making the request over HTTP for compatibility with previous releases. When this happens, a LifecycleHTTPFallback event is recorded in the namespace of the pod and a kubelet_lifecycle_handler_http_fallbacks_total metric in the kubelet is incremented. Cluster administrators can opt out of the expanded lifecycle handler capabilities by setting --feature-gates=ConsistentHTTPGetHandlers=false in kubelet.' (kubernetes/kubernetes#86139, @jasimmons)

  • 'Graduated JobTrackingWithFinalizers to stable. Jobs created before the feature was enabled are still tracked without finalizers. Jobs tracked with finalizers have the annotation batch.kubernetes.io/job-tracking. If the annotation is present and the user attempts to remove it, the control plane adds it back. The annotation batch.kubernetes.io/job-tracking is now deprecated. The control plane will ignore it and stop adding it for new Jobs in v1.27.' (kubernetes/kubernetes#113510, @alculquicondor)

  • 'Kubelet added the following Pod failure conditions:

  • 'Priority and Fairness has introduced a new feature called borrowing that allows an API priority level to borrow a number of seats from other priority level(s). As a cluster operator, you can enable borrowing for a certain priority level configuration object via the two newly introduced fields lendablePercent, and borrowingLimitPercent located under the .spec.limited field of the designated priority level. This change added the following metrics:

    • apiserver_flowcontrol_nominal_limit_seats: Nominal number of execution seats configured for each priority level
    • apiserver_flowcontrol_lower_limit_seats: Configured lower bound on number of execution seats available to each priority level
    • apiserver_flowcontrol_upper_limit_seats: Configured upper bound on number of execution seats available to each priority level
    • apiserver_flowcontrol_demand_seats: Observations, at the end of every nanosecond, of (the number of seats each priority level could use) / (nominal number of seats for that level)
    • apiserver_flowcontrol_demand_seats_high_watermark: High watermark, over last adjustment period, of demand_seats
    • apiserver_flowcontrol_demand_seats_average: Time-weighted average, over last adjustment period, of demand_seats
    • apiserver_flowcontrol_demand_seats_stdev: Time-weighted standard deviation, over last adjustment period, of demand_seats
    • apiserver_flowcontrol_demand_seats_smoothed: Smoothed seat demands
    • apiserver_flowcontrol_target_seats: Seat allocation targets
    • apiserver_flowcontrol_seat_fair_frac: Fair fraction of server's concurrency to allocate to each priority level that can use it
    • apiserver_flowcontrol_current_limit_seats: current derived number of execution seats available to each priority level The possibility of borrowing means that the old metric apiserver_flowcontrol_request_concurrency_limit can no longer mean both the configured concurrency limit and the enforced concurrency limit. Henceforth it means the configured concurrency limit.' (kubernetes/kubernetes#113485, @MikeSpreitzer)

  • 'NodeInclusionPolicy in podTopologySpread plugin is now enabled by default.' (kubernetes/kubernetes#113500, @kerthcet)

  • 'PodDisruptionBudget now adds an alpha spec.unhealthyPodEvictionPolicy field. When the PDBUnhealthyPodEvictionPolicy feature-gate is enabled in kube-apiserver, setting this field to "AlwaysAllow" allows pods to be evicted if they do not have a ready condition, regardless of whether the PodDisruptionBudget is currently healthy.' (kubernetes/kubernetes#113375, @atiratree)

  • 'metav1.LabelSelectors specified in API objects are now validated to ensure they do not contain invalid label values that will error at time of use. Existing invalid objects can be updated, but new objects are required to contain valid label selectors.' (kubernetes/kubernetes#113699, @liggitt)

  • Add percentageOfNodesToScore as a scheduler profile level parameter to API version v1. When a profile percentageOfNodesToScore is set, it will override global percentageOfNodesToScore. (kubernetes/kubernetes#112521, @yuanchen8911)

  • Add auth API to get self subject attributes (new selfsubjectreviews API is added). The corresponding command for kubctl is provided - kubectl auth whoami. (kubernetes/kubernetes#111333, @nabokihms) [SIG API Machinery, Auth, CLI and Testing]

  • Added kubernetes_feature_enabled metric series to track whether each active feature gate is enabled. (kubernetes/kubernetes#112690, @logicalhan)

  • Added a --topology-manager-policy-options flag to the kubelet to support fine tuning the topology manager policies. The first policy option, prefer-closest-numa-nodes, allows these policies to favor sets of NUMA nodes with shorter distance between nodes when making admission decisions. (kubernetes/kubernetes#112914, @PiotrProkop)

  • Added a feature that allows a StatefulSet to start numbering replicas from an arbitrary non-negative ordinal, using the .spec.ordinals.start field. (kubernetes/kubernetes#112744, @pwschuurman)

  • Added a kube-proxy flag (--iptables-localhost-nodeports, default true) to allow disabling NodePort services on loopback addresses. Note: this only applies to iptables mode and ipv4. (kubernetes/kubernetes#108250, @cyclinder)

  • Added a new namespace alpha field to DataSourceRef field in PersistentVolumeClaim API. (kubernetes/kubernetes#113186, @ttakahashi21)

  • Aggregated discovery will be alpha and can be toggled with the AggregatedDiscoveryEndpoint feature flag. (kubernetes/kubernetes#113171, @Jefftree)

  • Clarified the CFS quota as 100ms in the code comments and set the minimum cpuCFSQuotaPeriod to 1ms to match Linux kernel expectations. (kubernetes/kubernetes#112123, @paskal)

  • Component-base: make the validation logic about LeaderElectionConfiguration consistent between component-base and client-go (kubernetes/kubernetes#111758, @SataQiu) [SIG API Machinery and Scheduling]

  • Deprecated the apiserver_request_slo_duration_seconds metric for v1.27 in favor of apiserver_request_sli_duration_seconds for naming consistency purposes with other SLI-specific metrics and to avoid any confusion between SLOs and SLIs. (kubernetes/kubernetes#112679, @dgrisonnet)

  • Enable the "Retriable and non-retriable pod failures for jobs" feature into beta. (kubernetes/kubernetes#113360, @mimowo)

  • Enabled kube-controller-manager to support '--concurrent-horizontal-pod-autoscaler-syncs' flag to set the number of horizontal pod autoscaler controller workers. (kubernetes/kubernetes#108501, @zroubalik)

  • Fixed spurious field is immutable errors validating updates to Event API objects via the events.k8s.io/v1 API. (kubernetes/kubernetes#112183, @liggitt)

  • Graduated ServiceInternalTrafficPolicy feature to GA. (kubernetes/kubernetes#113496, @avoltz)

  • In 'kube-proxy`: The "userspace" proxy mode (deprecated for over a year) is no longer supported on either Linux or Windows. Users should use "iptables" or "ipvs" on Linux, or "kernelspace" on Windows. (kubernetes/kubernetes#112133, @knabben)

  • Introduce v1beta3 for Priority and Fairness with the following changes to the API spec:

    • rename 'assuredConcurrencyShares' (located under `spec.limited') to 'nominalConcurrencyShares'.
    • apply strategic merge patch annotations to 'Conditions' of flowschemas and prioritylevelconfigurations. (kubernetes/kubernetes#112306, @tkashem)

  • Introduced v1alpha1 API for validating admission policies, enabling extensible admission control via CEL expressions (KEP 3488: CEL for Admission Control). To use, enable the ValidatingAdmissionPolicy feature gate and the admissionregistration.k8s.io/v1alpha1 API via --runtime-config. (kubernetes/kubernetes#113314, @cici37)

  • KMS: added validation for duplicate kms config name when auto reload is enabled. If you enabled automatic reload of encryption configuration with API server flag --encryption-provider-config-automatic-reload, ensure all the KMS provider names (v1 and v2) in the encryption configuration are unique. (kubernetes/kubernetes#113697, @aramase)

  • Kubelet external Credential Provider feature is moved to GA. Credential Provider Plugin and Credential Provider Config APIs updated from v1beta1 to v1 with no API changes. (kubernetes/kubernetes#111616, @ndixita)

  • Legacy klog flags are no longer available. Only -v and -vmodule are still supported. (kubernetes/kubernetes#112120, @pohly) [SIG Architecture, CLI, Instrumentation, Node and Testing]

  • Moved MixedProtocolLBService from beta to GA. (kubernetes/kubernetes#112895, @janosi)

  • New Pod API field .spec.schedulingGates is introduced to enable users to control when to mark a Pod as scheduling ready. (kubernetes/kubernetes#113274, @Huang-Wei)

  • Protobuf serialization of metav1.MicroTime timestamps (used in Lease and Event API objects) has been corrected to truncate to microsecond precision, to match the documented behavior and JSON/YAML serialization. Any existing persisted data is truncated to microsecond when read from etcd. (kubernetes/kubernetes#111936, @haoruan)

  • Removed feature gates ServiceLoadBalancerClass and ServiceLBNodePortControl. These feature gates were enabled (and locked) since v1.24. (kubernetes/kubernetes#112577, @andrewsykim)

  • Reverted regression that prevented client-go latency metrics to be reported with a template URL to avoid label cardinality. (kubernetes/kubernetes#111752, @aanm)

  • The EndpointSliceTerminatingCondition feature gate was graduated to GA. The gate is now locked and will be removed in v1.28. (kubernetes/kubernetes#113351, @andrewsykim)

  • DynamicKubeletConfig feature gate has been removed from the API server. Dynamic kubelet reconfiguration now can't be used even when older nodes are still attempting to rely on it. This is aligned with the Kubernetes version skew policy. (kubernetes/kubernetes#112643, @SergeyKanzhelev)

  • kubectl wait command with jsonpath flag will wait for target path until timeout. (kubernetes/kubernetes#109525, @jonyhy96)

  • Add a ResourceClaim API (in the resource.k8s.io/v1alpha1 API group and behind the DynamicResourceAllocation feature gate). The new API is more flexible than the existing Device Plugins feature of Kubernetes because it allows Pods to request (claim) special kinds of resources, which can be available at node level, cluster level, or following any other model you implement. (kubernetes/kubernetes#111023, @pohly) [SIG API Machinery, Apps, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Node, Release, Scheduling, Storage and Testing]

  • PodDisruptionBudget adds an alpha spec.unhealthyPodEvictionPolicy field. When the PDBUnhealthyPodEvictionPolicy feature-gate is enabled in kube-apiserver, setting this field to "AlwaysAllow" allows pods to be evicted if they do not have a ready condition, regardless of whether the PodDisruptionBudget is currently healthy. (kubernetes/kubernetes#113375, @atiratree) [SIG API Machinery, Apps, Auth and Testing]

  • A new preEnqueue extension point is added to scheduler's component config v1beta2/v1beta3/v1. (kubernetes/kubernetes#113275, @Huang-Wei) [SIG API Machinery, Apps, Instrumentation, Scheduling and Testing]

  • Add a new namespace alpha field to dataSourceRef field in PersistentVolumeClaim API. (kubernetes/kubernetes#113186, @ttakahashi21) [SIG API Machinery, Apps, Storage and Testing]

  • Add a kube-proxy flag (--iptables-localhost-nodeports, default true) to allow disabling NodePort services on loopback addresses. Note: this only applies to iptables mode and ipv4. (kubernetes/kubernetes#108250, @cyclinder) [SIG API Machinery, Cloud Provider, Network, Node, Scalability, Storage and Testing]

  • Added a --topology-manager-policy-options flag to the kubelet to support fine tuning the topology manager policies. The first policy option, prefer-closest-numa-nodes, allows these policies to favor sets of NUMA nodes with shorter distance between nodes when making admission decisions. (kubernetes/kubernetes#112914, @PiotrProkop) [SIG API Machinery and Node]

  • Added a feature that allows a StatefulSet to start numbering replicas from an arbitrary non-negative ordinal, using the .spec.ordinals.start field. (kubernetes/kubernetes#112744, @pwschuurman) [SIG API Machinery and Apps]

  • Deprecate the apiserver_request_slo_duration_seconds metric for v1.27 in favor of apiserver_request_sli_duration_seconds for naming consistency purposes with other SLI-specific metrics and to avoid any confusion between SLOs and SLIs. (kubernetes/kubernetes#112679, @dgrisonnet) [SIG API Machinery and Instrumentation]

  • Enable the "Retriable and non-retriable pod failures for jobs" feature into beta (kubernetes/kubernetes#113360, @mimowo) [SIG Apps, Auth, Node, Scheduling and Testing]

  • Graduate JobTrackingWithFinalizers to stable. Jobs created before the feature was enabled are still tracked without finalizers. Users can choose to migrate jobs to tracking with finalizers by adding the annotation batch.kubernetes.io/job-tracking. If the annotation was already present and the user attempts to remove it, the control plane adds the annotation back. (kubernetes/kubernetes#113510, @alculquicondor) [SIG API Machinery, Apps and Testing]

  • Graduate ServiceInternalTrafficPolicy feature to GA (kubernetes/kubernetes#113496, @avoltz) [SIG Apps and Network]

  • If you enabled automatic reload of encryption configuration with API server flag --encryption-provider-config-automatic-reload, ensure all the KMS provider names (v1 and v2) in the encryption configuration are unique. (kubernetes/kubernetes#113697, @aramase) [SIG API Machinery and Auth]

  • Introduce v1alpha1 API for validating admission policies, enabling extensible admission control via CEL expressions (KEP 3488: CEL for Admission Control). To use, enable the ValidatingAdmissionPolicy feature gate and the admissionregistration.k8s.io/v1alpha1 API via --runtime-config. (kubernetes/kubernetes#113314, @cici37) [SIG API Machinery, Auth, Cloud Provider and Testing]

  • Kubelet adds the following pod failure conditions:

  • Metav1.LabelSelectors specified in API objects are now validated to ensure they do not contain invalid label values that will error at time of use. Existing invalid objects can be updated, but new objects are required to contain valid label selectors. (kubernetes/kubernetes#113699, @liggitt) [SIG API Machinery, Apps, Auth, Network and Storage]

  • Moving MixedProtocolLBService from beta to GA (kubernetes/kubernetes#112895, @janosi) [SIG Apps, Network and Testing]

  • New Pod API field .spec.schedulingGates is introduced to enable users to control when to mark a Pod as scheduling ready. (kubernetes/kubernetes#113274, @Huang-Wei) [SIG Apps, Scheduling and Testing]

  • NodeInclusionPolicy in podTopologySpread plugin is enabled by default. (kubernetes/kubernetes#113500, @kerthcet) [SIG API Machinery, Apps, Scheduling and Testing]

  • Priority and Fairness has introduced a new feature called borrowing that allows an API priority level to borrow a number of seats from other priority level(s). As a cluster operator, you can enable borrowing for a certain priority level configuration object via the two newly introduced fields lendablePercent, and borrowingLimitPercent located under the .spec.limited field of the designated priority level. This PR adds the following metrics.

    • apiserver_flowcontrol_nominal_limit_seats: Nominal number of execution seats configured for each priority level
    • apiserver_flowcontrol_lower_limit_seats: Configured lower bound on number of execution seats available to each priority level
    • apiserver_flowcontrol_upper_limit_seats: Configured upper bound on number of execution seats available to each priority level
    • apiserver_flowcontrol_demand_seats: Observations, at the end of every nanosecond, of (the number of seats each priority level could use) / (nominal number of seats for that level)
    • apiserver_flowcontrol_demand_seats_high_watermark: High watermark, over last adjustment period, of demand_seats
    • apiserver_flowcontrol_demand_seats_average: Time-weighted average, over last adjustment period, of demand_seats
    • apiserver_flowcontrol_demand_seats_stdev: Time-weighted standard deviation, over last adjustment period, of demand_seats
    • apiserver_flowcontrol_demand_seats_smoothed: Smoothed seat demands
    • apiserver_flowcontrol_target_seats: Seat allocation targets
    • apiserver_flowcontrol_seat_fair_frac: Fair fraction of server's concurrency to allocate to each priority level that can use it
    • apiserver_flowcontrol_current_limit_seats: current derived number of execution seats available to each priority level

    The possibility of borrowing means that the old metric apiserver_flowcontrol_request_concurrency_limit can no longer mean both the configured concurrency limit and the enforced concurrency limit. Henceforth it means the configured concurrency limit. (kubernetes/kubernetes#113485, @MikeSpreitzer) [SIG API Machinery and Testing]

  • The EndpointSliceTerminatingCondition feature gate has graduated to GA. The gate is now locked and will be removed in v1.28. (kubernetes/kubernetes#113351, @andrewsykim) [SIG API Machinery, Apps, Network and Testing]

  • Yes, aggregated discovery will be alpha and can be toggled with the AggregatedDiscoveryEndpoint feature flag (kubernetes/kubernetes#113171, @Jefftree) [SIG API Machinery, Apps, Architecture, Auth, Autoscaling, CLI, Cloud Provider, Cluster Lifecycle, Network, Node, Release, Scalability, Scheduling, Storage and Testing]

  • Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

    ([kubernetes/kubernetes#86139](kubernetes/kubernetes#86139), [@jasimmons](https://github.com/jasimmons)) [SIG API Machinery, Apps, Architecture, Auth, Autoscaling, CLI, Contributor Experience, Instrumentation, Network, Node, Release, Scheduling, Storage and Testing]

  • Add percentageOfNodesToScore as a scheduler profile level parameter to API version v1. If a profile percentageOfNodesToScore is set, it will override global percentageOfNodesToScore. (kubernetes/kubernetes#112521, @yuanchen8911) [SIG API Machinery, Scheduling and Testing]

  • Kube-controller-manager supports '--concurrent-horizontal-pod-autoscaler-syncs' flag to set the number of horizontal pod autoscaler controller workers. (kubernetes/kubernetes#108501, @zroubalik) [SIG API Machinery, Apps and Autoscaling]

  • Kube-proxy: The "userspace" proxy mode (deprecated for over a year) is no longer supported on either Linux or Windows. Users should use "iptables" or "ipvs" on Linux, or "kernelspace" on Windows. (kubernetes/kubernetes#112133, @knabben) [SIG API Machinery, Network, Scalability, Testing and Windows]

  • Kubectl wait command with jsonpath flag will wait for target path appear until timeout. (kubernetes/kubernetes#109525, @jonyhy96) [SIG CLI and Testing]

  • Kubelet external Credential Provider feature is moved to GA. Credential Provider Plugin and Credential Provider Config APIs updated from v1beta1 to v1 with no API changes. (kubernetes/kubernetes#111616, @ndixita) [SIG API Machinery, Node, Scheduling and Testing]

  • The DynamicKubeletConfig feature gate has been removed from the API server. Dynamic kubelet reconfiguration now cannot be used even when older nodes are still attempting to rely on it. This is aligned with the Kubernetes version skew policy. (kubernetes/kubernetes#112643, @SergeyKanzhelev) [SIG API Machinery, Apps, Auth, Node and Testing]

  • Add kubernetes_feature_enabled metric series to track whether each active feature gate is enabled. (kubernetes/kubernetes#112690, @logicalhan) [SIG API Machinery, Architecture, Cluster Lifecycle, Instrumentation, Network, Node and Scheduling]

  • Introduce v1beta3 for Priority and Fairness with the following changes to the API spec:

    • rename 'assuredConcurrencyShares' (located under spec.limited') to 'nominalConcurrencyShares'
    • apply strategic merge patch annotations to 'Conditions' of flowschemas and prioritylevelconfigurations (kubernetes/kubernetes#112306, @tkashem) [SIG API Machinery and Testing]

  • Legacy klog flags are no longer available. Only -v and -vmodule are still supported. (kubernetes/kubernetes#112120, @pohly) [SIG Architecture, CLI, Instrumentation, Node and Testing]

  • The feature gates ServiceLoadBalancerClass and ServiceLBNodePortControl have been removed. These feature gates were enabled (and locked) since v1.24. (kubernetes/kubernetes#112577, @andrewsykim) [SIG Apps]

  • Add auth API to get self subject attributes (new selfsubjectreviews API is added). The corresponding command for kubctl is provided - kubectl auth whoami. (kubernetes/kubernetes#111333, @nabokihms) [SIG API Machinery, Auth, CLI and Testing]

  • Clarified the CFS quota as 100ms in the code comments and set the minimum cpuCFSQuotaPeriod to 1ms to match Linux kernel expectations. (kubernetes/kubernetes#112123, @paskal) [SIG API Machinery and Node]

  • Component-base: make the validation logic about LeaderElectionConfiguration consistent between component-base and client-go (kubernetes/kubernetes#111758, @SataQiu) [SIG API Machinery and Scheduling]

  • Fixes spurious field is immutable errors validating updates to Event API objects via the events.k8s.io/v1 API (kubernetes/kubernetes#112183, @liggitt) [SIG Apps]

  • Protobuf serialization of metav1.MicroTime timestamps (used in Lease and Event API objects) has been corrected to truncate to microsecond precision, to match the documented behavior and JSON/YAML serialization. Any existing persisted data is truncated to microsecond when read from etcd. (kubernetes/kubernetes#111936, @haoruan) [SIG API Machinery]

  • Revert regression that prevented client-go latency metrics to be reported with a template URL to avoid label cardinality. (kubernetes/kubernetes#111752, @aanm) [SIG API Machinery]

  • [kubelet] Change default cpuCFSQuotaPeriod value with enabled cpuCFSQuotaPeriod flag from 100ms to 100µs to match the Linux CFS and k8s defaults. cpuCFSQuotaPeriod of 100ms now requires customCPUCFSQuotaPeriod flag to be set to work. (kubernetes/kubernetes#111520, @paskal) [SIG API Machinery and Node]

v25.3.0

Kubernetes API Version: v1.25.3

Feature

  • Adds support for loading CA certificates from a file using the idp-certificate-authority key for the oidc plugin. (#1916, @vgupta3)

v25.3.0b1

Kubernetes API Version: v1.25.3

Feature

  • Adds support for loading CA certificates from a file using the idp-certificate-authority key for the oidc plugin. (#1916, @vgupta3)

v25.2.0b1

Kubernetes API Version: v1.25.3

Feature

  • Adds support for loading CA certificates from a file using the idp-certificate-authority key for the oidc plugin. (#1916, @vgupta3)

v25.2.0a1

Kubernetes API Version: v1.25.2

API Change

  • Revert regression that prevented client-go latency metrics to be reported with a template URL to avoid label cardinality. (kubernetes/kubernetes#112055, @aanm) [SIG API Machinery]
  • Add NodeInclusionPolicy to TopologySpreadConstraints in PodSpec. (kubernetes/kubernetes#108492, @kerthcet)
  • Added KMS v2alpha1 support. (kubernetes/kubernetes#111126, @aramase)
  • Added a deprecated warning for node beta label usage in PV/SC/RC and CSI Storage Capacity. (kubernetes/kubernetes#108554, @pacoxu)
  • Added a new feature gate CheckpointRestore to enable support to checkpoint containers. If enabled it is possible to checkpoint a container using the newly kubelet API (/checkpoint/{podNamespace}/{podName}/{containerName}). (kubernetes/kubernetes#104907, @adrianreber) [SIG Node and Testing]
  • Added alpha support for user namespaces in pods phase 1 (KEP 127, feature gate: UserNamespacesStatelessPodsSupport) (kubernetes/kubernetes#111090, @rata)
  • As of v1.25, the PodSecurity restricted level no longer requires pods that set .spec.os.name="windows" to also set Linux-specific securityContext fields. If a 1.25+ cluster has unsupported out-of-skew nodes prior to v1.23 and wants to ensure namespaces enforcing the restricted policy continue to require Linux-specific securityContext fields on all pods, ensure a version of the restricted prior to v1.25 is selected by labeling the namespace (for example, pod-security.kubernetes.io/enforce-version: v1.24) (kubernetes/kubernetes#105919, @ravisantoshgudimetla)
  • Changed ownership semantics of PersistentVolume's spec.claimRef from atomic to granular. (kubernetes/kubernetes#110495, @alexzielenski)
  • Extended ContainerStatus CRI API to allow runtime response with container resource requests and limits that are in effect.
  • For v1.25, Kubernetes will be using Golang 1.19, In this PR the version is updated to 1.19rc2 as GA is not yet available. (kubernetes/kubernetes#111254, @dims)
  • Introduced NodeIPAM support for multiple ClusterCIDRs (kubernetes/kubernetes#2593) as an alpha feature. Set feature gate MultiCIDRRangeAllocator=true, determines whether the MultiCIDRRangeAllocator controller can be used, while the kube-controller-manager flag below will pick the active controller. Enabled the MultiCIDRRangeAllocator by setting --cidr-allocator-type=MultiCIDRRangeAllocator flag in kube-controller-manager. (kubernetes/kubernetes#109090, @sarveshr7)
  • Introduced PodHasNetwork condition for pods. (kubernetes/kubernetes#111358, @ddebroy)
  • Introduced support for handling pod failures with respect to the configured pod failure policy rules. (kubernetes/kubernetes#111113, @mimowo)
  • Introduction of the DisruptionTarget pod condition type. Its reason field indicates the reason for pod termination:
    • PreemptionByKubeScheduler (Pod preempted by kube-scheduler)
    • DeletionByTaintManager (Pod deleted by taint manager due to NoExecute taint)
    • EvictionByEvictionAPI (Pod evicted by Eviction API)
    • DeletionByPodGC (an orphaned Pod deleted by PodGC) (kubernetes/kubernetes#110959, @mimowo)
  • Kube-Scheduler ComponentConfig is graduated to GA, kubescheduler.config.k8s.io/v1 is available now. Plugin SelectorSpread is removed in v1. (kubernetes/kubernetes#110534, @kerthcet)
  • Local Storage Capacity Isolation feature is GA in 1.25 release. For systems (rootless) that cannot check root file system, please use kubelet config --local-storage-capacity-isolation=false to disable this feature. Once disabled, pod cannot set local ephemeral storage request/limit, and emptyDir sizeLimit niether. (kubernetes/kubernetes#111513, @jingxu97)
  • Make PodSpec.Ports' description clearer on how this information is only informational and how it can be incorrect. (kubernetes/kubernetes#110564, @j4m3s-s) [SIG API Machinery, Network and Node]
  • On compatible systems, a mounter's Unmount implementation is changed to not return an error when the specified target can be detected as not a mount point. On Linux, the behavior of detecting a mount point depends on umount command is validated when the mounter is created. Additionally, mount point checks will be skipped in CleanupMountPoint/CleanupMountWithForce if the mounter's Unmount having the changed behavior of not returning error when target is not a mount point. (kubernetes/kubernetes#109676, @cartermckinnon) [SIG Storage]
  • PersistentVolumeClaim objects are no longer left with storage class set to nil forever, but will be updated retroactively once any StorageClass is set or created as default. (kubernetes/kubernetes#111467, @RomanBednar)
  • Promote StatefulSet minReadySeconds to GA. This means --feature-gates=StatefulSetMinReadySeconds=true are not needed on kube-apiserver and kube-controller-manager binaries and they'll be removed soon following policy at https://kubernetes.io/docs/reference/using-api/deprecation-policy/#deprecation (kubernetes/kubernetes#110896, @ravisantoshgudimetla) [SIG API Machinery, Apps and Testing]
  • Promoted CronJob's TimeZone support to beta. (kubernetes/kubernetes#111435, @soltysh)
  • Promoted DaemonSet MaxSurge to GA. This means --feature-gates=DaemonSetUpdateSurge=true are not needed on kube-apiserver and kube-controller-manager binaries and they'll be removed soon following policy at https://kubernetes.io/docs/reference/using-api/deprecation-policy/#deprecation . (kubernetes/kubernetes#111194, @ravisantoshgudimetla)
  • Scheduler: included supported ScoringStrategyType list in error message for NodeResourcesFit plugin (kubernetes/kubernetes#111206, @SataQiu)
  • The Go API for logging configuration in k8s.io/component-base was moved to k8s.io/component-base/logs/api/v1. The configuration file format and command line flags are the same as before. (kubernetes/kubernetes#105797, @pohly)
  • The Pod spec.podOS field is promoted to GA. The IdentifyPodOS feature gate unconditionally enabled, and will no longer be accepted as a --feature-gates parameter in 1.27. (kubernetes/kubernetes#111229, @ravisantoshgudimetla)
  • The PodTopologySpread is respected after rolling upgrades. (kubernetes/kubernetes#111441, @denkensk)
  • The CSIInlineVolume feature has moved from beta to GA. (kubernetes/kubernetes#111258, @dobsonj)
  • The PodSecurity admission plugin has graduated to GA and is enabled by default. The admission configuration version has been promoted to pod-security.admission.config.k8s.io/v1. (kubernetes/kubernetes#110459, @wangyysde)
  • The endPort field in Network Policy is now promoted to GA Network Policy providers that support endPort field now can use it to specify a range of ports to apply a Network Policy. Previously, each Network Policy could only target a single port. Please be aware that endPort field MUST BE SUPPORTED by the Network Policy provider. In case your provider does not support endPort and this field is specified in a Network Policy, the Network Policy will be created covering only the port field (single port). (kubernetes/kubernetes#110868, @rikatz)
  • The metadata.clusterName field is completely removed. This should not have any user-visible impact. (kubernetes/kubernetes#109602, @lavalamp)
  • The minDomains field in Pod Topology Spread is graduated to beta (kubernetes/kubernetes#110388, @sanposhiho) [SIG API Machinery and Apps]
  • The command line flag enable-taint-manager for kube-controller-manager is deprecated and will be removed in 1.26. The feature that it supports, taint based eviction, is enabled by default and will continue to be implicitly enabled when the flag is removed. (kubernetes/kubernetes#111411, @alculquicondor)
  • This release added support for NodeExpandSecret for CSI driver client which enables the CSI drivers to make use of this secret while performing node expansion operation based on the user request. Previously there was no secret provided as part of the nodeexpansion call, thus CSI drivers did not make use of the same while expanding the volume at the node side. (kubernetes/kubernetes#105963, @zhucan)
  • Ephemeral Containers are now generally available (GA). The EphemeralContainers feature gate is always enabled and should be removed from --feature-gates flag on the kube-apiserver and the kubelet command lines. The EphemeralContainers feature gate is deprecated and scheduled for removal in a future release. (kubernetes/kubernetes#111402, @verb)
  • Introduces support for handling pod failures with respect to the configured pod failure policy rules (kubernetes/kubernetes#111113, @mimowo) [SIG API Machinery, Apps, Auth, Scheduling and Testing]
  • NodeIPAM support for multiple ClusterCIDRs (kubernetes/enhancements#2593) introduced as an alpha feature. Setting feature gate MultiCIDRRangeAllocator=true, determines whether the MultiCIDRRangeAllocator controller can be used, while the kube-controller-manager flag below will pick the active controller. Enable the MultiCIDRRangeAllocator by setting --cidr-allocator-type=MultiCIDRRangeAllocator flag in kube-controller-manager. (kubernetes/kubernetes#109090, @sarveshr7) [SIG API Machinery, Apps, Auth, CLI, Cloud Provider, Instrumentation, Network and Testing]
  • The CSIInlineVolume feature has moved from beta to GA. (kubernetes/kubernetes#111258, @dobsonj) [SIG API Machinery, Apps, Auth, Instrumentation, Storage and Testing]
  • Added alpha support for user namespaces in pods phase 1 (KEP 127, feature gate: UserNamespacesSupport) (kubernetes/kubernetes#111090, @rata) [SIG Apps, Auth, Network, Node, Storage and Testing]
  • Adds KMS v2alpha1 support (kubernetes/kubernetes#111126, @aramase) [SIG API Machinery, Auth, Instrumentation and Testing]
  • As of v1.25, the PodSecurity restricted level no longer requires pods that set .spec.os.name="windows" to also set Linux-specific securityContext fields. If a 1.25+ cluster has unsupported out-of-skew nodes prior to v1.23 and wants to ensure namespaces enforcing the restricted policy continue to require Linux-specific securityContext fields on all pods, ensure a version of the restricted prior to v1.25 is selected by labeling the namespace (for example, pod-security.kubernetes.io/enforce-version: v1.24) (kubernetes/kubernetes#105919, @ravisantoshgudimetla) [SIG API Machinery, Apps, Auth, Testing and Windows]
  • Changes ownership semantics of PersistentVolume's spec.claimRef from atomic to granular. (kubernetes/kubernetes#110495, @alexzielenski) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Instrumentation and Testing]
  • Extends ContainerStatus CRI API to allow runtime response with container resource requests and limits that are in effect.
  • For v1.25, Kubernetes will be using golang 1.19, In this PR we update to 1.19rc2 as GA is not yet available. (kubernetes/kubernetes#111254, @dims) [SIG Apps, Architecture, Auth, Autoscaling, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Release, Scheduling, Storage and Testing]
  • Introduce PodHasNetwork condition for pods (kubernetes/kubernetes#111358, @ddebroy) [SIG Apps, Node and Testing]
  • Introduction of the DisruptionTarget pod condition type. Its reason field indicates the reason for pod termination:
    • PreemptionByKubeScheduler (Pod preempted by kube-scheduler)
    • DeletionByTaintManager (Pod deleted by taint manager due to NoExecute taint)
    • EvictionByEvictionAPI (Pod evicted by Eviction API)
    • DeletionByPodGC (an orphaned Pod deleted by PodGC) (kubernetes/kubernetes#110959, @mimowo) [SIG Apps, Auth, Node, Scheduling and Testing]
  • Kube-Scheduler ComponentConfig is graduated to GA, kubescheduler.config.k8s.io/v1 is available now. Plugin SelectorSpread is removed in v1. (kubernetes/kubernetes#110534, @kerthcet) [SIG API Machinery, Scheduling and Testing]
  • Local Storage Capacity Isolation feature is GA in 1.25 release. For systems (rootless) that cannot check root file system, please use kubelet config --local-storage-capacity-isolation=false to disable this feature. Once disabled, pod cannot set local ephemeral storage request/limit, and emptyDir sizeLimit niether. (kubernetes/kubernetes#111513, @jingxu97) [SIG API Machinery, Node, Scalability and Scheduling]
  • PersistentVolumeClaim objects are no longer left with storage class set to nil forever, but will be updated retroactively once any StorageClass is set or created as default. (kubernetes/kubernetes#111467, @RomanBednar) [SIG Apps, Storage and Testing]
  • Promote CronJob's TimeZone support to beta (kubernetes/kubernetes#111435, @soltysh) [SIG API Machinery, Apps and Testing]
  • Promote DaemonSet MaxSurge to GA. This means --feature-gates=DaemonSetUpdateSurge=true are not needed on kube-apiserver and kube-controller-manager binaries and they'll be removed soon following policy at https://kubernetes.io/docs/reference/using-api/deprecation-policy/#deprecation (kubernetes/kubernetes#111194, @ravisantoshgudimetla) [SIG Apps]
  • Respect PodTopologySpread after rolling upgrades (kubernetes/kubernetes#111441, @denkensk) [SIG API Machinery, Apps, Scheduling and Testing]
  • Scheduler: include supported ScoringStrategyType list in error message for NodeResourcesFit plugin (kubernetes/kubernetes#111206, @SataQiu) [SIG Scheduling]
  • The Pod spec.podOS field is promoted to GA. The IdentifyPodOS feature gate unconditionally enabled, and will no longer be accepted as a --feature-gates parameter in 1.27. (kubernetes/kubernetes#111229, @ravisantoshgudimetla) [SIG API Machinery, Apps and Windows]
  • The command line flag enable-taint-manager for kube-controller-manager is deprecated and will be removed in 1.26. The feature that it supports, taint based eviction, is enabled by default and will continue to be implicitly enabled when the flag is removed. (kubernetes/kubernetes#111411, @alculquicondor) [SIG API Machinery]
  • Ephemeral Containers are now generally available. The EphemeralContainers feature gate is always enabled and should be removed from --feature-gates flag on the kube-apiserver and the kubelet command lines. The EphemeralContainers feature gate is deprecated and scheduled for removal in a future release. (kubernetes/kubernetes#111402, @verb) [SIG API Machinery, Apps, Node, Storage and Testing]
  • Added a new feature gate CheckpointRestore to enable support to checkpoint containers. If enabled it is possible to checkpoint a container using the newly kubelet API (/checkpoint/{podNamespace}/{podName}/{containerName}). (kubernetes/kubernetes#104907, @adrianreber) [SIG Node and Testing]
  • EndPort field in Network Policy is now promoted to GA Network Policy providers that support endPort field now can use it to specify a range of ports to apply a Network Policy. Previously, each Network Policy could only target a single port. Please be aware that endPort field MUST BE SUPPORTED by the Network Policy provider. In case your provider does not support endPort and this field is specified in a Network Policy, the Network Policy will be created covering only the port field (single port). (kubernetes/kubernetes#110868, @rikatz) [SIG API Machinery, Network and Testing]
  • Make PodSpec.Ports' description clearer on how this information is only informational and how it can be incorrect. (kubernetes/kubernetes#110564, @j4m3s-s) [SIG API Machinery, Network and Node]
  • On compatible systems, a mounter's Unmount implementation is changed to not return an error when the specified target can be detected as not a mount point. On Linux, the behavior of detecting a mount point depends on umount command is validated when the mounter is created. Additionally, mount point checks will be skipped in CleanupMountPoint/CleanupMountWithForce if the mounter's Unmount having the changed behavior of not returning error when target is not a mount point. (kubernetes/kubernetes#109676, @cartermckinnon) [SIG Storage]
  • Promote StatefulSet minReadySeconds to GA. This means --feature-gates=StatefulSetMinReadySeconds=true are not needed on kube-apiserver and kube-controller-manager binaries and they'll be removed soon following policy at https://kubernetes.io/docs/reference/using-api/deprecation-policy/#deprecation (kubernetes/kubernetes#110896, @ravisantoshgudimetla) [SIG API Machinery, Apps and Testing]
  • The Pod spec.podOS field is promoted to GA. The IdentifyPodOS feature gate unconditionally enabled, and will no longer be accepted as a --feature-gates parameter in 1.27. (kubernetes/kubernetes#111229, @ravisantoshgudimetla) [SIG API Machinery, Apps and Windows]
  • The minDomains field in Pod Topology Spread is graduated to beta (kubernetes/kubernetes#110388, @sanposhiho) [SIG API Machinery and Apps]
  • The Go API for logging configuration in k8s.io/component-base was moved to k8s.io/component-base/logs/api/v1. The configuration file format and command line flags are the same as before. (kubernetes/kubernetes#105797, @pohly) [SIG API Machinery, Architecture, Cluster Lifecycle, Instrumentation, Node, Scheduling and Testing]
  • The PodSecurity admission plugin has graduated to GA and is enabled by default. The admission configuration version has been promoted to pod-security.admission.config.k8s.io/v1. (kubernetes/kubernetes#110459, @wangyysde) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Node, Storage and Testing]
  • Introduce NodeInclusionPolicies to specify nodeAffinity/nodeTaint strategy when calculating pod topology spread skew. (kubernetes/kubernetes#108492, @kerthcet) [SIG API Machinery, Apps, Scheduling and Testing]
  • The metadata.clusterName field is completely removed. This should not have any user-visible impact. (kubernetes/kubernetes#109602, @lavalamp) [SIG API Machinery, Apps, Auth and Testing]
  • This release add support for NodeExpandSecret for CSI driver client which enables the CSI drivers to make use of this secret while performing node expansion operation based on the user request. Previously there was no secret provided as part of the nodeexpansion call, thus CSI drivers were not make use of the same while expanding the volume at node side. (kubernetes/kubernetes#105963, @zhucan) [SIG API Machinery, Apps and Storage]

v24.2.0

Kubernetes API Version: v1.24.2

Uncategorized

  • The dynamic client now support the _request_timeout parameter to configure connection and request timeouts. (#1732, @philipp-sontag-by)

v24.1.0b1

Kubernetes API Version: v1.24.1

Uncategorized

  • The dynamic client now support the _request_timeout parameter to configure connection and request timeouts. (#1732, @philipp-sontag-by)

v24.1.0a1

Kubernetes API Version: v1.24.1

API Change

  • Add 2 new options for kube-proxy running in winkernel mode. --forward-healthcheck-vip, if specified as true, health check traffic whose destination is service VIP will be forwarded to kube-proxy's healthcheck service. --root-hnsendpoint-name specifies the name of the hns endpoint for the root network namespace. This option enables the pass-through load balancers like Google's GCLB to correctly health check the backend services. Without this change, the health check packets is dropped, and Windows node will be considered to be unhealthy by those load balancers. (kubernetes/kubernetes#99287, @anfernee)
  • Added CEL runtime cost calculation into CustomerResource validation. CustomerResource validation will fail if runtime cost exceeds the budget. (kubernetes/kubernetes#108482, @cici37)
  • Added a new metric webhook_fail_open_count to monitor webhooks that fail to open. (kubernetes/kubernetes#107171, @ltagliamonte-dd)
  • Adds a new Status subresource in Network Policy objects (kubernetes/kubernetes#107963, @rikatz)
  • Adds support for InterfaceNamePrefix and BridgeInterface as arguments to --detect-local-mode option and also introduces a new optional --pod-interface-name-prefix and --pod-bridge-interface flags to kube-proxy. (kubernetes/kubernetes#95400, @tssurya)
  • CEL CRD validation expressions may now reference existing object state using the identifier oldSelf. (kubernetes/kubernetes#108073, @benluddy)
  • CRD deep copies should no longer contain shallow copies of JSONSchemaProps.XValidations. (kubernetes/kubernetes#107956, @benluddy)
  • CRD writes will generate validation errors if a CEL validation rule references the identifier oldSelf on a part of the schema that does not support it. (kubernetes/kubernetes#108013, @benluddy)
  • CSIStorageCapacity.storage.k8s.io: The v1beta1 version of this API is deprecated in favor of v1, and will be removed in v1.27. If a CSI driver supports storage capacity tracking, then it must get deployed with a release of external-provisioner that supports the v1 API. (kubernetes/kubernetes#108445, @pohly)
  • Custom resource requests with fieldValidation=Strict consistently require apiVersion and kind, matching non-strict requests (kubernetes/kubernetes#109019, @liggitt)
  • Feature of DefaultPodTopologySpread is graduated to GA (kubernetes/kubernetes#108278, @kerthcet)
  • Feature of NonPreemptingPriority is graduated to GA (kubernetes/kubernetes#107432, @denkensk)
  • Feature of PodOverhead is graduated to GA (kubernetes/kubernetes#108441, @pacoxu)
  • Fixed OpenAPI serialization of the x-kubernetes-validations field (kubernetes/kubernetes#107970, @liggitt)
  • Fixed failed flushing logs in defer function when kubelet cmd exit 1. (kubernetes/kubernetes#104774, @kerthcet)
  • Fixes a regression in v1beta1 PodDisruptionBudget handling of strategic merge patch-type API requests for the selector field. Prior to 1.21, these requests would merge matchLabels content and replace matchExpressions content. In 1.21, patch requests touching the selector field started replacing the entire selector. This is consistent with server-side apply and the v1 PodDisruptionBudget behavior, but should not have been changed for v1beta1. (kubernetes/kubernetes#108138, @liggitt)
  • Improve kubectl's user help commands readability (kubernetes/kubernetes#104736, @lauchokyip)
  • Indexed Jobs graduated to stable. (kubernetes/kubernetes#107395, @alculquicondor)
  • Introduce a v1alpha1 networking API for ClusterCIDRConfig (kubernetes/kubernetes#108290, @sarveshr7)
  • Introduction of a new "sync_proxy_rules_no_local_endpoints_total" proxy metric. This metric represents the number of services with no internal endpoints. The "traffic_policy" label will contain both "internal" or "external". (kubernetes/kubernetes#108930, @MaxRenaud)
  • JobReadyPods graduates to Beta and it's enabled by default. (kubernetes/kubernetes#107476, @alculquicondor)
  • Kube-apiserver: --audit-log-version and --audit-webhook-version now only support the default value of audit.k8s.io/v1. The v1alpha1 and v1beta1 audit log versions, deprecated since 1.13, have been removed. (kubernetes/kubernetes#108092, @carlory)
  • Kube-apiserver: the metadata.selfLink field can no longer be populated by kube-apiserver; it was deprecated in 1.16 and has not been populated by default since 1.20+. (kubernetes/kubernetes#107527, @wojtek-t)
  • Kubelet external Credential Provider feature is moved to Beta. Credential Provider Plugin and Credential Provider Config API's updated from v1alpha1 to v1beta1 with no API changes. (kubernetes/kubernetes#108847, @adisky)
  • Make STS available replicas optional again. (kubernetes/kubernetes#109241, @ravisantoshgudimetla)
  • MaxUnavailable for StatefulSets, allows faster RollingUpdate by taking down more than 1 pod at a time. The number of pods you want to take down during a RollingUpdate is configurable using maxUnavailable parameter. (kubernetes/kubernetes#82162, @krmayankk)
  • Non-graceful node shutdown handling is enabled for stateful workload failovers (kubernetes/kubernetes#108486, @sonasingh46)
  • Omit enum declarations from the static openapi file captured at https://git.k8s.io/kubernetes/api/openapi-spec. This file is used to generate API clients, and use of enums in those generated clients (rather than strings) can break forward compatibility with additional future values in those fields. See https://issue.k8s.io/109177 for details. (kubernetes/kubernetes#109178, @liggitt)
  • OpenAPI V3 is turned on by default (kubernetes/kubernetes#109031, @Jefftree)
  • Pod affinity namespace selector and cross-namespace quota graduated to GA. The feature gate PodAffinityNamespaceSelector is locked and will be removed in 1.26. (kubernetes/kubernetes#108136, @ahg-g)
  • Promote IdentifyPodOS feature to beta. (kubernetes/kubernetes#107859, @ravisantoshgudimetla)
  • Remove a v1alpha1 networking API for ClusterCIDRConfig (kubernetes/kubernetes#109436, @JamesLaverack)
  • Renamed metrics evictions_number to evictions_total and mark it as stable. The original evictions_number metrics name is marked as "Deprecated" and has been removed in kubernetes 1.23 . (kubernetes/kubernetes#106366, @cyclinder)
  • Skip x-kubernetes-validations rules if having fundamental error against the OpenAPIv3 schema. (kubernetes/kubernetes#108859, @cici37)
  • Support for gRPC probes is now in beta. GRPCContainerProbe feature gate is enabled by default. (kubernetes/kubernetes#108522, @SergeyKanzhelev)
  • Suspend job to GA. The feature gate SuspendJob is locked and will be removed in 1.26. (kubernetes/kubernetes#108129, @ahg-g)
  • The AnyVolumeDataSource feature is now beta, and the feature gate is enabled by default. In order to provide user feedback on PVCs with data sources, deployers must install the VolumePopulators CRD and the data-source-validator controller. (kubernetes/kubernetes#108736, @bswartz)
  • The CertificateSigningRequest spec.expirationSeconds API field has graduated to GA. The CSRDuration feature gate for the field is now unconditionally enabled and will be removed in 1.26. (kubernetes/kubernetes#108782, @cfryanr)
  • The ServerSideFieldValidation feature has graduated to beta and is now enabled by default. Kubectl 1.24 and newer will use server-side validation instead of client-side validation when writing to API servers with the feature enabled. (kubernetes/kubernetes#108889, @kevindelgado)
  • The ServiceLBNodePortControl feature has graduated to GA. The feature gate will be removed in 1.26. (kubernetes/kubernetes#107027, @uablrek)
  • The deprecated kube-controller-manager flag '--deployment-controller-sync-period' has been removed, it is not used by the deployment controller. (kubernetes/kubernetes#107178, @SataQiu)
  • The feature DynamicKubeletConfig has been removed from the kubelet. (kubernetes/kubernetes#106932, @SergeyKanzhelev)
  • The infrastructure for contextual logging is complete (feature gate implemented, JSON backend ready). (kubernetes/kubernetes#108995, @pohly)
  • This adds an optional timeZone field as part of the CronJob spec to support running cron jobs in a specific time zone. (kubernetes/kubernetes#108032, @deejross)
  • Updated the default API priority-and-fairness config to avoid endpoint/configmaps operations from controller-manager to all match leader-election priority level. (kubernetes/kubernetes#106725, @wojtek-t)
  • topologySpreadConstraints includes minDomains field to limit the minimum number of topology domains. (kubernetes/kubernetes#107674, @sanposhiho)
  • Introduce a v1alpha1 networking API for ClusterCIDRConfig (kubernetes/kubernetes#108290, @sarveshr7) [SIG API Machinery, Apps, Auth, CLI, Cloud Provider, Instrumentation, Network and Testing]
  • Introduction of a new "sync_proxy_rules_no_local_endpoints_total" proxy metric. This metric represents the number of services with no internal endpoints. The "traffic_policy" label will contain both "internal" or "external". (kubernetes/kubernetes#108930, @MaxRenaud) [SIG API Machinery, Apps, Architecture, Auth, Autoscaling, CLI, Cloud Provider, Instrumentation, Network, Node, Release, Scheduling, Storage, Testing and Windows]
  • Make STS available replicas optional again, (kubernetes/kubernetes#109241, @ravisantoshgudimetla) [SIG API Machinery and Apps]
  • Omit enum declarations from the static openapi file captured at https://git.k8s.io/kubernetes/api/openapi-spec. This file is used to generate API clients, and use of enums in those generated clients (rather than strings) can break forward compatibility with additional future values in those fields. See https://issue.k8s.io/109177 for details. (kubernetes/kubernetes#109178, @liggitt) [SIG API Machinery and Auth]
  • Remove a v1alpha1 networking API for ClusterCIDRConfig (kubernetes/kubernetes#109436, @JamesLaverack) [SIG API Machinery, Apps, Auth, CLI, Network and Testing]
  • The deprecated kube-controller-manager flag '--deployment-controller-sync-period' has been removed, it is not used by the deployment controller. (kubernetes/kubernetes#107178, @SataQiu) [SIG API Machinery and Apps]
  • Adds a new Status subresource in Network Policy objects (kubernetes/kubernetes#107963, @rikatz) [SIG API Machinery, Apps, Network and Testing]
  • Adds support for "InterfaceNamePrefix" and "BridgeInterface" as arguments to --detect-local-mode option and also introduces a new optional --pod-interface-name-prefix and --pod-bridge-interface flags to kube-proxy. (kubernetes/kubernetes#95400, @tssurya) [SIG API Machinery and Network]
  • CEL CRD validation expressions may now reference existing object state using the identifier oldSelf. (kubernetes/kubernetes#108073, @benluddy) [SIG API Machinery and Testing]
  • CSIStorageCapacity.storage.k8s.io: The v1beta1 version of this API is deprecated in favor of v1, and will be removed in v1.27. If a CSI driver supports storage capacity tracking, then it must get deployed with a release of external-provisioner that supports the v1 API. (kubernetes/kubernetes#108445, @pohly) [SIG API Machinery, Architecture, Auth, Scheduling, Storage and Testing]
  • Custom resource requests with fieldValidation=Strict consistently require apiVersion and kind, matching non-strict requests (kubernetes/kubernetes#109019, @liggitt) [SIG API Machinery]
  • Improve kubectl's user help commands readability (kubernetes/kubernetes#104736, @lauchokyip) [SIG API Machinery, Apps, Architecture, Auth, Autoscaling, CLI, Cloud Provider, Cluster Lifecycle, Contributor Experience, Instrumentation, Network, Node, Release, Scalability, Scheduling, Security, Storage, Testing and Windows]
  • Indexed Jobs graduates to stable (kubernetes/kubernetes#107395, @alculquicondor) [SIG Apps, Architecture and Testing]
  • Introduce a v1alpha1 networking API for ClusterCIDRConfig (kubernetes/kubernetes#108290, @sarveshr7) [SIG API Machinery, Apps, Auth, CLI, Cloud Provider, Instrumentation, Network and Testing]
  • JobReadyPods graduates to Beta and it's enabled by default. (kubernetes/kubernetes#107476, @alculquicondor) [SIG API Machinery, Apps and Testing]
  • Kubelet external Credential Provider feature is moved to Beta. Credential Provider Plugin and Credential Provider Config API's updated from v1alpha1 to v1beta1 with no API changes. (kubernetes/kubernetes#108847, @adisky) [SIG API Machinery and Node]
  • MaxUnavailable for StatefulSets, allows faster RollingUpdate by taking down more than 1 pod at a time. The number of pods you want to take down during a RollingUpdate is configurable using maxUnavailable parameter. (kubernetes/kubernetes#82162, @krmayankk) [SIG API Machinery and Apps]
  • Non graceful node shutdown handling. (kubernetes/kubernetes#108486, @sonasingh46) [SIG Apps, Node and Storage]
  • OpenAPI V3 is turned on by default (kubernetes/kubernetes#109031, @Jefftree) [SIG API Machinery, Apps, Architecture, Auth, Autoscaling, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Scheduling, Storage and Testing]
  • Promote IdentifyPodOS feature to beta. (kubernetes/kubernetes#107859, @ravisantoshgudimetla) [SIG API Machinery, Apps, Node, Testing and Windows]
  • Skip x-kubernetes-validations rules if having fundamental error against OpenAPIv3 schema. (kubernetes/kubernetes#108859, @cici37) [SIG API Machinery and Testing]
  • Support for gRPC probes is now in beta. GRPCContainerProbe feature gate is enabled by default. (kubernetes/kubernetes#108522, @SergeyKanzhelev) [SIG API Machinery, Apps, Node and Testing]
  • The AnyVolumeDataSource feature is now beta, and the feature gate is enabled by default. In order to provide user feedback on PVCs with data sources, deployers must install the VolumePopulators CRD and the data-source-validator controller. (kubernetes/kubernetes#108736, @bswartz) [SIG Apps, Storage and Testing]
  • The ServerSideFieldValidation feature has graduated to beta and is now enabled by default. Kubectl 1.24 and newer will use server-side validation instead of client-side validation when writing to API servers with the feature enabled. (kubernetes/kubernetes#108889, @kevindelgado) [SIG API Machinery, Architecture, CLI and Testing]
  • The infrastructure for contextual logging is complete (feature gate implemented, JSON backend ready). (kubernetes/kubernetes#108995, @pohly) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Scheduling and Testing]
  • This adds an optional timeZone field as part of the CronJob spec to support running cron jobs in a specific time zone. (kubernetes/kubernetes#108032, @deejross) [SIG API Machinery and Apps]
  • Add 2 new options for kube-proxy running in winkernel mode. --forward-healthcheck-vip, if specified as true, health check traffic whose destination is service VIP will be forwarded to kube-proxy's healthcheck service. --root-hnsendpoint-name specifies the name of the hns endpoint for the root network namespace. This option enables the pass-through load balancers like Google's GCLB to correctly health check the backend services. Without this change, the health check packets is dropped, and Windows node will be considered to be unhealthy by those load balancers. (kubernetes/kubernetes#99287, @anfernee) [SIG API Machinery, Cloud Provider, Network, Testing and Windows]
  • Added CEL runtime cost calculation into CustomerResource validation. CustomerResource validation will fail if runtime cost exceeds the budget. (kubernetes/kubernetes#108482, @cici37) [SIG API Machinery]
  • CRD writes will generate validation errors if a CEL validation rule references the identifier "oldSelf" on a part of the schema that does not support it. (kubernetes/kubernetes#108013, @benluddy) [SIG API Machinery]
  • Feature of DefaultPodTopologySpread is graduated to GA (kubernetes/kubernetes#108278, @kerthcet) [SIG Scheduling]
  • Feature of PodOverhead is graduated to GA (kubernetes/kubernetes#108441, @pacoxu) [SIG API Machinery, Apps, Node and Scheduling]
  • Fixes a regression in v1beta1 PodDisruptionBudget handling of "strategic merge patch"-type API requests for the selector field. Prior to 1.21, these requests would merge matchLabels content and replace matchExpressions content. In 1.21, patch requests touching the selector field started replacing the entire selector. This is consistent with server-side apply and the v1 PodDisruptionBudget behavior, but should not have been changed for v1beta1. (kubernetes/kubernetes#108138, @liggitt) [SIG Apps, Auth and Testing]
  • Kube-apiserver: --audit-log-version and --audit-webhook-version now only support the default value of audit.k8s.io/v1. The v1alpha1 and v1beta1 audit log versions, deprecated since 1.13, have been removed. (kubernetes/kubernetes#108092, @carlory) [SIG API Machinery, Auth and Testing]
  • Pod-affinity namespace selector and cross-namespace quota graduated to GA. The feature gate PodAffinityNamespaceSelector is locked and will be removed in 1.26. (kubernetes/kubernetes#108136, @ahg-g) [SIG API Machinery, Apps, Scheduling and Testing]
  • Suspend job to GA. The feature gate SuspendJob is locked and will be removed in 1.26. (kubernetes/kubernetes#108129, @ahg-g) [SIG Apps and Testing]
  • The CertificateSigningRequest spec.expirationSeconds API field has graduated to GA. The CSRDuration feature gate for the field is now unconditionally enabled and will be removed in 1.26. (kubernetes/kubernetes#108782, @cfryanr) [SIG API Machinery, Apps, Auth, Instrumentation and Testing]
  • TopologySpreadConstraints includes minDomains field to limit the minimum number of topology domains. (kubernetes/kubernetes#107674, @sanposhiho) [SIG API Machinery, Apps and Scheduling]
  • CRD deep copies should no longer contain shallow copies of JSONSchemaProps.XValidations. (kubernetes/kubernetes#107956, @benluddy) [SIG API Machinery]
  • Feature of NonPreemptingPriority is graduated to GA (kubernetes/kubernetes#107432, @denkensk) [SIG Apps, Scheduling and Testing]
  • Fix OpenAPI serialization of the x-kubernetes-validations field (kubernetes/kubernetes#107970, @liggitt) [SIG API Machinery]
  • Kube-apiserver: the metadata.selfLink field can no longer be populated by kube-apiserver; it was deprecated in 1.16 and has not been populated by default in 1.20+. (kubernetes/kubernetes#107527, @wojtek-t) [SIG API Machinery, Apps, Auth, Autoscaling, CLI, Cloud Provider, Network, Scheduling, Storage and Testing]
  • Add a new metric webhook_fail_open_count to monitor webhooks that fail open (kubernetes/kubernetes#107171, @ltagliamonte-dd) [SIG API Machinery and Instrumentation]
  • Fix failed flushing logs in defer function when kubelet cmd exit 1. (kubernetes/kubernetes#104774, @kerthcet) [SIG Node and Scheduling]
  • Rename metrics evictions_number to evictions_total and mark it as stable. The original evictions_number metrics name is marked as "Deprecated" and will be removed in kubernetes 1.23 (kubernetes/kubernetes#106366, @cyclinder) [SIG API Machinery, Apps, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Release, Scalability, Scheduling, Storage, Testing and Windows]
  • The ServiceLBNodePortControl feature graduates to GA. The feature gate will be removed in 1.26. (kubernetes/kubernetes#107027, @uablrek) [SIG Network and Testing]
  • The feature DynamicKubeletConfig is removed from the kubelet. (kubernetes/kubernetes#106932, @SergeyKanzhelev) [SIG Apps, Auth, Instrumentation, Node and Testing]
  • Update default API priority-and-fairness config to avoid endpoint/configmaps operations from controller-manager to all match leader-election priority level. (kubernetes/kubernetes#106725, @wojtek-t) [SIG API Machinery]

v23.6.0

Kubernetes API Version: v1.23.6

API Change

  • Omits alpha-level enums from the static openapi file captured in api/openapi-spec (kubernetes/kubernetes#109179, @liggitt) [SIG Apps and Auth]
  • Fixes a regression in v1beta1 PodDisruptionBudget handling of "strategic merge patch"-type API requests for the selector field. Prior to 1.21, these requests would merge matchLabels content and replace matchExpressions content. In 1.21, patch requests touching the selector field started replacing the entire selector. This is consistent with server-side apply and the v1 PodDisruptionBudget behavior, but should not have been changed for v1beta1. (kubernetes/kubernetes#108139, @liggitt) [SIG Auth and Testing]

v23.3.0

Kubernetes API Version: v1.23.4

v23.3.0b1

Kubernetes API Version: v1.23.4

API Change

v23.3.0a1

Kubernetes API Version: v1.23.3

API Change

  • A new field omitManagedFields has been added to both audit.Policy and audit.PolicyRule so cluster operators can opt in to omit managed fields of the request and response bodies from being written to the API audit log. (kubernetes/kubernetes#94986, @tkashem) [SIG API Machinery, Auth, Cloud Provider and Testing]

  • A small regression in Service updates was fixed. The circumstances are so unlikely that probably nobody would ever hit it. (kubernetes/kubernetes#104601, @thockin)

  • Added a feature gate StatefulSetAutoDeletePVC, which allows PVCs automatically created for StatefulSet pods to be automatically deleted. (kubernetes/kubernetes#99728, @mattcary)

  • Client-go impersonation config can specify a UID to pass impersonated uid information through in requests. (kubernetes/kubernetes#104483, @margocrawf)

  • Create HPA v2 from v2beta2 with some fields changed. (kubernetes/kubernetes#102534, @wangyysde) [SIG API Machinery, Apps, Auth, Autoscaling and Testing]

  • Ephemeral containers graduated to beta and are now available by default. (kubernetes/kubernetes#105405, @verb)

  • Fix kube-proxy regression on UDP services because the logic to detect stale connections was not considering if the endpoint was ready. (kubernetes/kubernetes#106163, @aojea) [SIG API Machinery, Apps, Architecture, Auth, Autoscaling, CLI, Cloud Provider, Contributor Experience, Instrumentation, Network, Node, Release, Scalability, Scheduling, Storage, Testing and Windows]

  • If a conflict occurs when creating an object with generateName, the server now returns an "AlreadyExists" error with a retry option. (kubernetes/kubernetes#104699, @vincepri)

  • Implement support for recovering from volume expansion failures (kubernetes/kubernetes#106154, @gnufied) [SIG API Machinery, Apps and Storage]

  • In kubelet, log verbosity and flush frequency can also be configured via the configuration file and not just via command line flags. In other commands (kube-apiserver, kube-controller-manager), the flags are listed in the "Logs flags" group and not under "Global" or "Misc". The type for -vmodule was made a bit more descriptive (pattern=N,... instead of moduleSpec). (kubernetes/kubernetes#106090, @pohly) [SIG API Machinery, Architecture, CLI, Cluster Lifecycle, Instrumentation, Node and Scheduling]

  • Introduce OS field in the PodSpec (kubernetes/kubernetes#104693, @ravisantoshgudimetla)

  • Introduce v1beta3 API for scheduler. This version

    • increases the weight of user specifiable priorities. The weights of following priority plugins are increased

      • TaintTolerations to 3 - as leveraging node tainting to group nodes in the cluster is becoming a widely-adopted practice
      • NodeAffinity to 2
      • InterPodAffinity to 2

    • Won't have HealthzBindAddress, MetricsBindAddress fields (kubernetes/kubernetes#104251, @ravisantoshgudimetla)

  • Introduce v1beta2 for Priority and Fairness with no changes in API spec. (kubernetes/kubernetes#104399, @tkashem)

  • JSON log output is configurable and now supports writing info messages to stdout and error messages to stderr. Info messages can be buffered in memory. The default is to write both to stdout without buffering, as before. (kubernetes/kubernetes#104873, @pohly)

  • JobTrackingWithFinalizers graduates to beta. Feature is enabled by default. (kubernetes/kubernetes#105687, @alculquicondor)

  • Kube-apiserver: Fixes handling of CRD schemas containing literal null values in enums. (kubernetes/kubernetes#104969, @liggitt)

  • Kube-apiserver: The rbac.authorization.k8s.io/v1alpha1 API version is removed; use the rbac.authorization.k8s.io/v1 API, available since v1.8. The scheduling.k8s.io/v1alpha1 API version is removed; use the scheduling.k8s.io/v1 API, available since v1.14. (kubernetes/kubernetes#104248, @liggitt)

  • Kube-scheduler: support for configuration file version v1beta1 is removed. Update configuration files to v1beta2(xref: kubernetes/enhancements#2901) or v1beta3 before upgrading to 1.23. (kubernetes/kubernetes#104782, @kerthcet)

  • KubeSchedulerConfiguration provides a new field MultiPoint which will register a plugin for all valid extension points (kubernetes/kubernetes#105611, @damemi) [SIG Scheduling and Testing]

  • Kubelet should reject pods whose OS doesn't match the node's OS label. (kubernetes/kubernetes#105292, @ravisantoshgudimetla) [SIG Apps and Node]

  • Kubelet: turn the KubeletConfiguration v1beta1 ResolverConfig field from a string to *string. (kubernetes/kubernetes#104624, @Haleygo)

  • Kubernetes is now built using go 1.17. (kubernetes/kubernetes#103692, @justaugustus)

  • Performs strict server side schema validation requests via the fieldValidation=[Strict,Warn,Ignore]. (kubernetes/kubernetes#105916, @kevindelgado)

  • Promote IPv6DualStack feature to stable. Controller Manager flags for the node IPAM controller have slightly changed:

    1. When configuring a dual-stack cluster, the user must specify both --node-cidr-mask-size-ipv4 and --node-cidr-mask-size-ipv6 to set the per-node IP mask sizes, instead of the previous --node-cidr-mask-size flag.
    2. The --node-cidr-mask-size flag is mutually exclusive with --node-cidr-mask-size-ipv4 and --node-cidr-mask-size-ipv6.
    3. Single-stack clusters do not need to change, but may choose to use the more specific flags. Users can use either the older --node-cidr-mask-size flag or one of the newer --node-cidr-mask-size-ipv4 or --node-cidr-mask-size-ipv6 flags to configure the per-node IP mask size, provided that the flag's IP family matches the cluster's IP family (--cluster-cidr). (kubernetes/kubernetes#104691, @khenidak)

  • Remove NodeLease feature gate that was graduated and locked to stable in 1.17 release. (kubernetes/kubernetes#105222, @cyclinder)

  • Removed deprecated --seccomp-profile-root/seccompProfileRoot config. (kubernetes/kubernetes#103941, @saschagrunert)

  • Since golang 1.17 both net.ParseIP and net.ParseCIDR rejects leading zeros in the dot-decimal notation of IPv4 addresses, Kubernetes will keep allowing leading zeros on IPv4 address to not break the compatibility. IMPORTANT: Kubernetes interprets leading zeros on IPv4 addresses as decimal, users must not rely on parser alignment to not being impacted by the associated security advisory: CVE-2021-29923 golang standard library "net" - Improper Input Validation of octal literals in golang 1.16.2 and below standard library "net" results in indeterminate SSRF & RFI vulnerabilities. Reference: https://nvd.nist.gov/vuln/detail/CVE-2021-29923 (kubernetes/kubernetes#104368, @aojea)

  • StatefulSet minReadySeconds is promoted to beta. (kubernetes/kubernetes#104045, @ravisantoshgudimetla)

  • Support pod priority based node graceful shutdown. (kubernetes/kubernetes#102915, @wzshiming)

  • The "Generic Ephemeral Volume" feature graduates to GA. It is now enabled unconditionally. (kubernetes/kubernetes#105609, @pohly)

  • The Kubelet's --register-with-taints option is now available via the Kubelet config file field registerWithTaints (kubernetes/kubernetes#105437, @cmssczy) [SIG Node and Scalability]

  • The CSIDriver.Spec.StorageCapacity can now be modified. (kubernetes/kubernetes#101789, @pohly)

  • The CSIVolumeFSGroupPolicy feature has moved from beta to GA. (kubernetes/kubernetes#105940, @dobsonj)

  • The IngressClass.Spec.Parameters.Namespace field is now GA. (kubernetes/kubernetes#104636, @hbagdi)

  • The Service.spec.ipFamilyPolicy field is now required in order to create or update a Service as dual-stack. This is a breaking change from the beta behavior. Previously the server would try to infer the value of that field from either ipFamilies or clusterIPs, but that caused ambiguity on updates. Users who want a dual-stack Service MUST specify ipFamilyPolicy as either "PreferDualStack" or "RequireDualStack". (kubernetes/kubernetes#96684, @thockin)

  • The TTLAfterFinished feature gate is now GA and enabled by default. (kubernetes/kubernetes#105219, @sahilvv)

  • The kube-controller-manager supports --concurrent-ephemeralvolume-syncs flag to set the number of ephemeral volume controller workers. (kubernetes/kubernetes#102981, @SataQiu)

  • The legacy scheduler policy config is removed in v1.23, the associated flags policy-config-file, policy-configmap, policy-configmap-namespace and use-legacy-policy-config are also removed. Migrate to Component Config instead, see https://kubernetes.io/docs/reference/scheduling/config/ for details. (kubernetes/kubernetes#105424, @kerthcet)

  • Track the number of Pods with a Ready condition in Job status. The feature is alpha and needs the feature gate JobReadyPods to be enabled. (kubernetes/kubernetes#104915, @alculquicondor)

  • Users of LogFormatRegistry in component-base must update their code to use the logr v1.0.0 API. The JSON log output now uses the format from go-logr/zapr (no v field for error messages, additional information for invalid calls) and has some fixes (correct source code location for warnings about invalid log calls). (kubernetes/kubernetes#104103, @pohly)

  • Validation rules for Custom Resource Definitions can be written in the CEL expression language using the x-kubernetes-validations extension in OpenAPIv3 schemas (alpha). This is gated by the alpha "CustomResourceValidationExpressions" feature gate. (kubernetes/kubernetes#106051, @jpbetz) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Node, Storage and Testing]

  • Add gRPC probe to Pod.Spec.Container.{Liveness,Readiness,Startup}Probe (#106463, @SergeyKanzhelev) [SIG API Machinery, Apps, CLI, Node and Testing]

  • Adds a feature gate StatefulSetAutoDeletePVC, which allows PVCs automatically created for StatefulSet pods to be automatically deleted. (#99728, @mattcary) [SIG API Machinery, Apps, Auth and Testing]

  • Performs strict server side schema validation requests via the fieldValidation=[Strict,Warn,Ignore] query parameter. (#105916, @kevindelgado) [SIG API Machinery, Apps, Auth, Cloud Provider and Testing]

  • Support pod priority based node graceful shutdown (#102915, @wzshiming) [SIG Node and Testing]

  • A new field omitManagedFields has been added to both audit.Policy and audit.PolicyRule so cluster operators can opt in to omit managed fields of the request and response bodies from being written to the API audit log. (#94986, @tkashem) [SIG API Machinery, Auth, Cloud Provider and Testing]

  • Create HPA v2 from v2beta2 with some fields changed. (#102534, @wangyysde) [SIG API Machinery, Apps, Auth, Autoscaling and Testing]

  • Fix kube-proxy regression on UDP services because the logic to detect stale connections was not considering if the endpoint was ready. (#106163, @aojea) [SIG API Machinery, Apps, Architecture, Auth, Autoscaling, CLI, Cloud Provider, Contributor Experience, Instrumentation, Network, Node, Release, Scalability, Scheduling, Storage, Testing and Windows]

  • Implement support for recovering from volume expansion failures (#106154, @gnufied) [SIG API Machinery, Apps and Storage]

  • In kubelet, log verbosity and flush frequency can also be configured via the configuration file and not just via command line flags. In other commands (kube-apiserver, kube-controller-manager), the flags are listed in the "Logs flags" group and not under "Global" or "Misc". The type for -vmodule was made a bit more descriptive (pattern=N,... instead of moduleSpec). (#106090, @pohly) [SIG API Machinery, Architecture, CLI, Cluster Lifecycle, Instrumentation, Node and Scheduling]

  • IngressClass.Spec.Parameters.Namespace field is now GA. (#104636, @hbagdi) [SIG Network and Testing]

  • KubeSchedulerConfiguration provides a new field MultiPoint which will register a plugin for all valid extension points (#105611, @damemi) [SIG Scheduling and Testing]

  • Kubelet should reject pods whose OS doesn't match the node's OS label. (#105292, @ravisantoshgudimetla) [SIG Apps and Node]

  • The CSIVolumeFSGroupPolicy feature has moved from beta to GA. (#105940, @dobsonj) [SIG Storage]

  • The Kubelet's --register-with-taints option is now available via the Kubelet config file field registerWithTaints (#105437, @cmssczy) [SIG Node and Scalability]

  • Validation rules for Custom Resource Definitions can be written in the CEL expression language using the x-kubernetes-validations extension in OpenAPIv3 schemas (alpha). This is gated by the alpha "CustomResourceValidationExpressions" feature gate. (#106051, @jpbetz) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Node, Storage and Testing]

  • Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

    (#104782, @kerthcet) [SIG Scheduling and Testing]

  • Ephemeral containers have reached beta maturity and are now available by default. (#105405, @verb) [SIG API Machinery, Apps, Node and Testing]

  • Introduce OS field in the Pod Spec (#104693, @ravisantoshgudimetla) [SIG API Machinery and Apps]

  • Introduce v1beta3 api for scheduler. This version

    • increases the weight of user specifiable priorities. The weights of following priority plugins are increased

      • TaintTolerations to 3 - as leveraging node tainting to group nodes in the cluster is becoming a widely-adopted practice
      • NodeAffinity to 2
      • InterPodAffinity to 2

    • Won't have HealthzBindAddress, MetricsBindAddress fields (#104251, @ravisantoshgudimetla) [SIG Scheduling and Testing]

  • JSON log output is configurable and now supports writing info messages to stdout and error messages to stderr. Info messages can be buffered in memory. The default is to write both to stdout without buffering, as before. (#104873, @pohly) [SIG API Machinery, Architecture, CLI, Cluster Lifecycle, Instrumentation, Node and Scheduling]

  • JobTrackingWithFinalizers graduates to beta. Feature is enabled by default. (#105687, @alculquicondor) [SIG Apps and Testing]

  • Remove NodeLease feature gate that was graduated and locked to stable in 1.17 release. (#105222, @cyclinder) [SIG Apps, Node and Testing]

  • TTLAfterFinished is now GA and enabled by default (#105219, @sahilvv) [SIG API Machinery, Apps, Auth and Testing]

  • The "Generic Ephemeral Volume" feature graduates to GA. It is now enabled unconditionally. (#105609, @pohly) [SIG API Machinery, Apps, Auth, Node, Scheduling, Storage and Testing]

  • The legacy scheduler policy config is removed in v1.23, the associated flags policy-config-file, policy-configmap, policy-configmap-namespace and use-legacy-policy-config are also removed. Migrate to Component Config instead, see https://kubernetes.io/docs/reference/scheduling/config/ for details. (#105424, @kerthcet) [SIG Scheduling and Testing]

  • Track the number of Pods with a Ready condition in Job status. The feature is alpha and needs the feature gate JobReadyPods to be enabled. (#104915, @alculquicondor) [SIG API Machinery, Apps, CLI and Testing]

  • Client-go impersonation config can specify a UID to pass impersonated uid information through in requests. (kubernetes/kubernetes#104483, @margocrawf) [SIG API Machinery, Auth and Testing]

  • IPv6DualStack feature moved to stable. Controller Manager flags for the node IPAM controller have slightly changed:

    1. When configuring a dual-stack cluster, the user must specify both --node-cidr-mask-size-ipv4 and --node-cidr-mask-size-ipv6 to set the per-node IP mask sizes, instead of the previous --node-cidr-mask-size flag.
    2. The --node-cidr-mask-size flag is mutually exclusive with --node-cidr-mask-size-ipv4 and --node-cidr-mask-size-ipv6.
    3. Single-stack clusters do not need to change, but may choose to use the more specific flags. Users can use either the older --node-cidr-mask-size flag or one of the newer --node-cidr-mask-size-ipv4 or --node-cidr-mask-size-ipv6 flags to configure the per-node IP mask size, provided that the flag's IP family matches the cluster's IP family (--cluster-cidr). (kubernetes/kubernetes#104691, @khenidak) [SIG API Machinery, Apps, Auth, Cloud Provider, Cluster Lifecycle, Network, Node and Testing]

  • Kubelet: turn the KubeletConfiguration v1beta1 ResolverConfig field from a string to *string. (kubernetes/kubernetes#104624, @Haleygo) [SIG Cluster Lifecycle and Node]

  • A small regression in Service updates was fixed. The circumstances are so unlikely that probably nobody would ever hit it. (kubernetes/kubernetes#104601, @thockin) [SIG Network]

  • Introduce v1beta2 for Priority and Fairness with no changes in API spec (kubernetes/kubernetes#104399, @tkashem) [SIG API Machinery and Testing]

  • Kube-apiserver: Fixes handling of CRD schemas containing literal null values in enums. (kubernetes/kubernetes#104969, @liggitt) [SIG API Machinery, Apps and Network]

  • Kubelet: turn the KubeletConfiguration v1beta1 ResolverConfig field from a string to *string. (kubernetes/kubernetes#104624, @Haleygo) [SIG Cluster Lifecycle and Node]

  • Kubernetes is now built using go1.17 (kubernetes/kubernetes#103692, @justaugustus) [SIG API Machinery, Apps, Architecture, Auth, Autoscaling, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Release, Scheduling, Storage and Testing]

  • Removed deprecated --seccomp-profile-root/seccompProfileRoot config (kubernetes/kubernetes#103941, @saschagrunert) [SIG Node]

  • Since golang 1.17 both net.ParseIP and net.ParseCIDR rejects leading zeros in the dot-decimal notation of IPv4 addresses. Kubernetes will keep allowing leading zeros on IPv4 address to not break the compatibility. IMPORTANT: Kubernetes interprets leading zeros on IPv4 addresses as decimal, users must not rely on parser alignment to not being impacted by the associated security advisory: CVE-2021-29923 golang standard library "net" - Improper Input Validation of octal literals in golang 1.16.2 and below standard library "net" results in indeterminate SSRF & RFI vulnerabilities. Reference: https://nvd.nist.gov/vuln/detail/CVE-2021-29923 (kubernetes/kubernetes#104368, @aojea) [SIG API Machinery, Apps, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Release, Scalability, Scheduling, Storage and Testing]

  • StatefulSet minReadySeconds is promoted to beta (kubernetes/kubernetes#104045, @ravisantoshgudimetla) [SIG Apps and Testing]

  • The Service.spec.ipFamilyPolicy field is now required in order to create or update a Service as dual-stack. This is a breaking change from the beta behavior. Previously the server would try to infer the value of that field from either ipFamilies or clusterIPs, but that caused ambiguity on updates. Users who want a dual-stack Service MUST specify ipFamilyPolicy as either "PreferDualStack" or "RequireDualStack". (kubernetes/kubernetes#96684, @thockin) [SIG API Machinery, Apps, Network and Testing]

  • Users of LogFormatRegistry in component-base must update their code to use the logr v1.0.0 API. The JSON log output now uses the format from go-logr/zapr (no v field for error messages, additional information for invalid calls) and has some fixes (correct source code location for warnings about invalid log calls). (kubernetes/kubernetes#104103, @pohly) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation and Storage]

  • When creating an object with generateName, if a conflict occurs the server now returns an AlreadyExists error with a retry option. (kubernetes/kubernetes#104699, @vincepri) [SIG API Machinery]

  • CSIDriver.Spec.StorageCapacity can now be modified. (kubernetes/kubernetes#101789, @pohly) [SIG Storage]

  • Kube-apiserver: The rbac.authorization.k8s.io/v1alpha1 API version is removed; use the rbac.authorization.k8s.io/v1 API, available since v1.8. The scheduling.k8s.io/v1alpha1 API version is removed; use the scheduling.k8s.io/v1 API, available since v1.14. (kubernetes/kubernetes#104248, @liggitt) [SIG API Machinery, Auth, Network and Testing]

  • Kube-controller-manager supports '--concurrent-ephemeralvolume-syncs' flag to set the number of ephemeral volume controller workers. (kubernetes/kubernetes#102981, @SataQiu) [SIG API Machinery and Apps]

v22.6.0

Kubernetes API Version: v1.22.6

Bug or Regression

  • Notable feature additions for async creation of Custom resources using dynamic Client (#1697, @venukarnati92)

Feature

  • Add utils.create_from_directory for creating all yaml files in a directory (#1683, @dingyiyi0226)

v22.6.0b1

Kubernetes API Version: v1.22.6

Feature

  • Add utils.create_from_directory for creating all yaml files in a directory (#1683, @dingyiyi0226)

v22.6.0a1

Kubernetes API Version: v1.22.6

API Change

  • Kube-apiserver: Fixes handling of CRD schemas containing literal null values in enums (#104988, @liggitt) [SIG API Machinery, Apps and Network]

  • A new score extension for NodeResourcesFit plugin that merges the functionality of NodeResourcesLeastAllocated, NodeResourcesMostAllocated, RequestedToCapacityRatio plugins, which are marked as deprecated as of v1beta2. In v1beta1, the three plugins can still be used in v1beta1 but not at the same time with the score extension of NodeResourcesFit. (kubernetes/kubernetes#101822, @yuzhiquan)

  • A value of Auto is now a valid for the service.kubernetes.io/topology-aware-hints annotation. (kubernetes/kubernetes#100728, @robscott)

  • Add DataSourceRef alpha field to PVC spec, which allows contents other than PVCs and VolumeSnapshots to be data sources. (kubernetes/kubernetes#103276, @bswartz)

  • Add PersistentVolumeClaimDeletePoilcy to StatefulSet API. (kubernetes/kubernetes#99378, @mattcary)

  • Add a new Priority and Fairness rule that exempts all probes (/readyz, /healthz, /livez) to prevent restarting of healthy kube-apiserver instance by kubelet. (kubernetes/kubernetes#100678, @tkashem)

  • Add alpha support for HostProcess containers on Windows (kubernetes/kubernetes#99576, @marosset) [SIG API Machinery, Apps, Node, Testing and Windows]

  • Add distributed tracing to the kube-apiserver. It is can be enabled with the feature gate APIServerTracing (kubernetes/kubernetes#94942, @dashpole)

  • Add three metrics to the job controller to monitor if a job works in healthy condition. IndexedJob has been promoted to Beta. (kubernetes/kubernetes#101292, @AliceZhang2016)

  • Added field .status.uncountedTerminatedPods to the Job resource. This field is used by the job controller to keep track of finished pods before adding them to the Job status counters. Pods created by the job controller get the finalizer batch.kubernetes.io/job-tracking Jobs that are tracked using this mechanism get the annotation batch.kubernetes.io/job-tracking. This is a temporary measure. Two releases after this feature graduates to beta, the annotation won't be added to Jobs anymore. (kubernetes/kubernetes#98817, @alculquicondor)

  • Added new kubelet alpha feature SeccompDefault. This feature enables falling back to the RuntimeDefault (former runtime/default) seccomp profile if nothing else is specified in the pod/container SecurityContext or the pod annotation level. To use the feature, enable the feature gate as well as set the kubelet configuration option SeccompDefault (--seccomp-default) to true. (kubernetes/kubernetes#101943, @saschagrunert) [SIG Node]

  • Adds the ReadWriteOncePod access mode for PersistentVolumes and PersistentVolumeClaims. Restricts volume access to a single pod on a single node. (kubernetes/kubernetes#102028, @chrishenzie)

  • Alpha swap support can now be enabled on Kubernetes nodes with the NodeSwapEnabled feature flag. See KEP-2400 for details. (kubernetes/kubernetes#102823, @ehashman)

  • Because of the implementation logic of time.Format in golang, the displayed time zone is not consistent. (kubernetes/kubernetes#102366, @cndoit18)

  • Corrected the documentation for escaping dollar signs in a container's env, command and args property. (kubernetes/kubernetes#101916, @MartinKanters) [SIG Apps]

  • Enable MaxSurge for DaemonSet by default. (kubernetes/kubernetes#101742, @ravisantoshgudimetla)

  • Enforce the ReadWriteOncePod PVC access mode during scheduling (kubernetes/kubernetes#103082, @chrishenzie)

  • Ephemeral containers are now allowed to configure a securityContext that differs from that of the Pod. Cluster administrators should ensure that security policy controllers support EphemeralContainers before enabling this feature in clusters. (kubernetes/kubernetes#99023, @verb)

  • Exec plugin authors can override default handling of standard input via new interactiveMode kubeconfig field. (kubernetes/kubernetes#99310, @ankeesler)

  • If someone had the ProbeTerminationGracePeriod alpha feature enabled in 1.21, they should update/delete any workloads/pods with probe terminationGracePeriods < 1 before upgrading (kubernetes/kubernetes#103245, @wzshiming)

  • Improved parsing of label selectors (kubernetes/kubernetes#102188, @alculquicondor) [SIG API Machinery]

  • Introduce minReadySeconds api to the StatefulSets. (kubernetes/kubernetes#100842, @ravisantoshgudimetla)

  • Introducing Memory quality of service support with cgroups v2 (Alpha). The MemoryQoS feature is now in Alpha. This allows kubelet running with cgroups v2 to set memory QoS at container, pod and QoS level to protect and guarantee better memory quality. This feature can be enabled through feature gate Memory QoS. (kubernetes/kubernetes#102970, @borgerli)

  • Kube API server accepts Impersonate-Uid header to impersonate a user with a specific UID, in the same way that you can currently use Impersonate-User, Impersonate-Group and Impersonate-Extra. (kubernetes/kubernetes#99961, @margocrawf)

  • Kube-apiserver: --service-account-issuer can be specified multiple times now, to enable non-disruptive change of issuer. (kubernetes/kubernetes#101155, @zshihang) [SIG API Machinery, Auth, Node and Testing]

  • Kube-controller-manager: the --horizontal-pod-autoscaler-use-rest-clients flag and Heapster support in the horizontal pod autoscaler, deprecated since 1.12, is removed. (kubernetes/kubernetes#90368, @serathius)

  • Kube-scheduler: a plugin enabled in a v1beta2 configuration file takes precedence over the default configuration for that plugin. This simplifies enabling default plugins with custom configuration without needing to explicitly disable those default plugins. (kubernetes/kubernetes#99582, @chendave)

  • New node-high priority-level has been added to Suggested API Priority and (kubernetes/kubernetes#101151, @mborsz)

  • NodeSwapEnabled feature flag was renamed to NodeSwap

    The flag was only available in the 1.22.0-beta.1 release, and the new flag should be used going forward. (kubernetes/kubernetes#103553, @ehashman) [SIG Node]

  • Omit comparison with boolean constant (kubernetes/kubernetes#101523, @chuntaochen) [SIG CLI and Cloud Provider]

  • Removed the feature flag for probe-level termination grace period from Kubelet. If a user wants to disable this feature on already created pods, they will have to delete and recreate the pods. (kubernetes/kubernetes#103168, @raisaat) [SIG Apps and Node]

  • Revert addition of Add PersistentVolumeClaimDeletePoilcy to StatefulSetAPI. (kubernetes/kubernetes#103747, @mattcary)

  • Scheduler could be configured to consider new resources beside CPU and memory, GPU for example, for the score plugin of NodeResourcesBalancedAllocation. (kubernetes/kubernetes#101946, @chendave) [SIG Scheduling]

  • Server Side Apply now treats all Selector fields as atomic (meaning the entire selector is managed by a single writer and updated together), since they contain interrelated and inseparable fields that do not merge in intuitive ways. (kubernetes/kubernetes#97989, @Danil-Grigorev) [SIG API Machinery]

  • Suspend Job feature graduated to beta. Added the action label to Job controller sync metrics job_sync_total and job_sync_duration_seconds. (kubernetes/kubernetes#102022, @adtac)

  • The API documentation for the DaemonSet's spec.updateStrategy.rollingUpdate.maxUnavailable field was corrected to state that the value is rounded up. (kubernetes/kubernetes#101296, @Miciah)

  • The CSIServiceAccountToken graduates to Ga and is unconditionally enabled. (kubernetes/kubernetes#103001, @zshihang)

  • The CertificateSigningRequest.certificates.k8s.io API supports an optional expirationSeconds field to allow the client to request a particular duration for the issued certificate. The default signer implementations provided by the Kubernetes controller manager will honor this field as long as it does not exceed the --cluster-signing-duration flag. (kubernetes/kubernetes#99494, @enj)

  • The EndpointSlicen Mirroring controller no longer mirrors the last-applied-configuration annotation created by kubectl to update EndpointSlices. (kubernetes/kubernetes#102731, @sharmarajdaksh)

  • The NetworkPolicyEndPort is graduated to beta and is enabled by default. (kubernetes/kubernetes#102834, @rikatz)

  • The PodDeletionCost feature has been promoted to beta, and enabled by default. (kubernetes/kubernetes#101080, @ahg-g)

  • The Server Side Apply treats certain structs as atomic. Meaning the entire selector field is managed by a single writer and updated together. (kubernetes/kubernetes#100684, @Jefftree)

  • The ServiceAppProtocol feature gate has been removed. It reached GA in Kubernetes (kubernetes/kubernetes#103190, @robscott)

  • The TerminationGracePeriodSeconds on pod specs and container probes should not be negative. Negative values of TerminationGracePeriodSeconds will be treated as the value 1s on the delete path. Immutable field validation will be relaxed in order to update negative values. In a future release, negative values will not be permitted. (kubernetes/kubernetes#98866, @wzshiming)

  • The kube-scheduler component config v1beta2 API available Three scheduler plugins deprecated (NodeLabel, ServiceAffinity, NodePreferAvoidPods). (kubernetes/kubernetes#99597, @adtac)

  • The pod/eviction subresource now accepts policy/v1 eviction requests in addition to policy/v1beta1 eviction requests (kubernetes/kubernetes#100724, @liggitt)

  • The podAffinity, NamespaceSelector and the associated CrossNamespaceAffinity quota scope features graduate to Beta and they are now enabled by default. (kubernetes/kubernetes#101496, @ahg-g)

  • The pods/ephemeralcontainers API now returns and expects a Pod object instead of EphemeralContainers. This is incompatible with the previous alpha-level API. (kubernetes/kubernetes#101034, @verb) [SIG Apps, Auth, CLI and Testing]

  • The v1.Node and .status.images[].names are now optional. (kubernetes/kubernetes#102159, @roycaihw)

  • The deprecated flag --algorithm-provider has been removed from kube-scheduler. Use instead ComponentConfig to configure the set of enabled plugins. (kubernetes/kubernetes#102239, @Haleygo)

  • The options --ssh-user and --ssh-key are removed. They only functioned on GCE, and only in-tree. Use the apiserver network proxy instead. (kubernetes/kubernetes#102297, @deads2k)

  • Track Job completion through status and Pod finalizers, removing dependency on Pod tombstones. (kubernetes/kubernetes#98238, @alculquicondor) [SIG API Machinery, Apps, Auth and Testing]

  • Track ownership of scale subresource for all scalable resources i.e. Deployment, ReplicaSet, StatefulSet, ReplicationController, and Custom Resources. (kubernetes/kubernetes#98377, @nodo) [SIG API Machinery and Testing]

  • Revert addition of Add PersistentVolumeClaimDeletePoilcy to StatefulSet API. (kubernetes/kubernetes#103747, @mattcary) [SIG API Machinery and Apps]

  • Added field .status.uncountedTerminatedPods to the Job resource. This field is used by the job controller to keep track of finished pods before adding them to the Job status counters.

    Pods created by the job controller get the finalizer batch.kubernetes.io/job-tracking

    Jobs that are tracked using this mechanism get the annotation batch.kubernetes.io/job-tracking. This is a temporary measure. Two releases after this feature graduates to beta, the annotation won't be added to Jobs anymore. (kubernetes/kubernetes#98817, @alculquicondor) [SIG API Machinery, Apps, Auth and CLI]

  • Ephemeral containers are now allowed to configure a securityContext that differs from that of the Pod.

    Cluster administrators should ensure that security policy controllers support EphemeralContainers before enabling this feature in clusters. (kubernetes/kubernetes#99023, @verb) [SIG API Machinery, Apps, Auth and Node]

  • If someone had the ProbeTerminationGracePeriod alpha feature enabled in 1.21, they should update/delete any workloads/pods with probe terminationGracePeriods < 1 before upgrading (kubernetes/kubernetes#103245, @wzshiming) [SIG Apps and Node]

  • Introducing Memory QoS support with cgroups v2 (Alpha) The MemoryQoS feature is now in Alpha. This allows kubelet running with cgroups v2 to set memory QoS at container, pod and QoS level to protect and guarantee better memory quality. This feature can be enabled through feature gate MemoryQoS. (kubernetes/kubernetes#102970, @borgerli) [SIG Node and Storage]

  • NodeSwapEnabled feature flag was renamed to NodeSwap

    The flag was only available in the 1.22.0-beta.1 release, and the new flag should be used going forward. (kubernetes/kubernetes#103553, @ehashman) [SIG Node]

  • Removed the feature flag for probe-level termination grace period from Kubelet. If a user wants to disable this feature on already created pods, they will have to delete and recreate the pods. (kubernetes/kubernetes#103168, @raisaat) [SIG Apps and Node]

  • Track Job completion through status and Pod finalizers, removing dependency on Pod tombstones. (kubernetes/kubernetes#98238, @alculquicondor) [SIG API Machinery, Apps, Auth and Testing]

  • When using kubectl replace (or the equivalent API call) on a Service, the caller no longer needs to do a read-modify-write cycle to fetch the allocated values for .spec.clusterIP and .spec.ports[].nodePort. Instead the API server will automatically carry these forward from the original object when the new object does not specify them. (kubernetes/kubernetes#103532, @thockin) [SIG Apps and Network]

  • A new score extension for NodeResourcesFit plugin that merges the functionality of NodeResourcesLeastAllocated,NodeResourcesMostAllocated,RequestedToCapacityRatio plugins, which are marked as deprecated as of v1beta2. In v1beta1, the three plugins can still be used in v1beta1 but not at the same time with the score extension of NodeResourcesFit

  • Add DataSourceRef alpha field to PVC spec, which allows contents other than PVCs and VolumeSnapshots to be data sources. (kubernetes/kubernetes#103276, @bswartz) [SIG API Machinery, Apps and Storage]

  • Add PersistentVolumeClaimDeletePoilcy to StatefulSet API. (kubernetes/kubernetes#99378, @mattcary) [SIG API Machinery and Apps]

  • Add distributed tracing to the kube-apiserver. It is can be enabled with the feature gate: APIServerTracing=true (kubernetes/kubernetes#94942, @dashpole) [SIG API Machinery, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Node, Storage and Testing]

  • Added new kubelet alpha feature SeccompDefault. This feature enables falling back to the RuntimeDefault (former runtime/default) seccomp profile if nothing else is specified in the pod/container SecurityContext or the pod annotation level. To use the feature, enable the feature gate as well as set the kubelet configuration option SeccompDefault (--seccomp-default) to true. (kubernetes/kubernetes#101943, @saschagrunert) [SIG Node]

  • Adds the ReadWriteOncePod access mode for PersistentVolumes and PersistentVolumeClaims. Restricts volume access to a single pod on a single node. (kubernetes/kubernetes#102028, @chrishenzie) [SIG Apps, CLI, Node, Scheduling and Storage]

  • Alpha swap support can now be enabled on Kubernetes nodes with the NodeSwapEnabled feature flag. See for details. (kubernetes/kubernetes#102823, @ehashman) [SIG Node]

  • CSIServiceAccountToken is GA. (kubernetes/kubernetes#103001, @zshihang) [SIG Auth and Storage]

  • Enforce the ReadWriteOncePod PVC access mode during scheduling (kubernetes/kubernetes#103082, @chrishenzie) [SIG Apps, CLI, Node, Scheduling and Storage]

  • Improved parsing of label selectors (kubernetes/kubernetes#102188, @alculquicondor) [SIG API Machinery]

  • Kube API server accepts Impersonate-Uid header to impersonate a user with a specific UID, in the same way that you can currently use Impersonate-User, Impersonate-Group and Impersonate-Extra (kubernetes/kubernetes#99961, @margocrawf) [SIG API Machinery, Auth and Testing]

  • Kube-scheduler: a plugin enabled in a v1beta2 configuration file takes precedence over the default configuration for that plugin; this simplifies enabling default plugins with custom configuration without needing to explicitly disable those default plugins. (kubernetes/kubernetes#99582, @chendave) [SIG Scheduling]

  • Scheduler could be configured to consider new resources beside CPU and memory, GPU for example, for the score plugin of NodeResourcesBalancedAllocation. (kubernetes/kubernetes#101946, @chendave) [SIG Scheduling]

  • Suspend Job feature graduated to beta Added the "action" label to Job controller sync metrics job_sync_total and job_sync_duration_seconds (kubernetes/kubernetes#102022, @adtac) [SIG Apps, Instrumentation and Testing]

  • TerminationGracePeriodSeconds on pod specs and container probes should not be negative. Negative values of TerminationGracePeriodSeconds will be treated as the value 1s on the delete path. Immutable field validation will be relaxed in order to update negative values. In a future release, negative values will not be permitted. (kubernetes/kubernetes#98866, @wzshiming) [SIG API Machinery, Apps and Node]

  • The API documentation for the DaemonSet's spec.updateStrategy.rollingUpdate.maxUnavailable field was corrected to state that the value is rounded up. (kubernetes/kubernetes#101296, @Miciah) [SIG Apps and CLI]

  • The CertificateSigningRequest.certificates.k8s.io API supports an optional expirationSeconds field to allow the client to request a particular duration for the issued certificate. The default signer implementations provided by the Kubernetes controller manager will honor this field as long as it does not exceed the --cluster-signing-duration flag. (kubernetes/kubernetes#99494, @enj) [SIG API Machinery, Apps, Auth, CLI, Instrumentation, Node, Security and Testing]

  • The ServiceAppProtocol feature gate has been removed. It reached GA in Kubernetes 1.20. (kubernetes/kubernetes#103190, @robscott) [SIG Network]

  • Because of the implementation logic of time.Format in golang, the displayed time zone is not consistent (kubernetes/kubernetes#102366, @cndoit18) [SIG Apps, Auth, Autoscaling, CLI, Cluster Lifecycle, Instrumentation, Network, Node and Testing]

  • Endpoint slices mirroring controller no longer mirrors the last-applied-configuration annotation created by kubectl to updated endpoint slices (kubernetes/kubernetes#102731, @sharmarajdaksh) [SIG API Machinery, Apps, Cloud Provider, Network, Release, Scheduling, Storage and Testing]

  • Exec plugin authors can override default handling of standard input via new interactiveMode kubeconfig field (kubernetes/kubernetes#99310, @ankeesler) [SIG API Machinery, Auth, CLI and Testing]

  • Kube-scheduler component config v1beta2 API available Three scheduler plugins deprecated (NodeLabel, ServiceAffinity, NodePreferAvoidPods) (kubernetes/kubernetes#99597, @adtac) [SIG Scheduling]

  • Network Policy EndPort is graduated to beta and is enabled by default (kubernetes/kubernetes#102834, @rikatz) [SIG Network]

  • --ssh-user and --ssh-key options are removed. They only functioned on GCE, and only in-tree. Use the apiserver network proxy instead. (kubernetes/kubernetes#102297, @deads2k) [SIG API Machinery, Cloud Provider and Testing]

  • Enable MaxSurge for DS by default (kubernetes/kubernetes#101742, @ravisantoshgudimetla) [SIG Apps and Testing]

  • Introduce minReadySeconds api to the StatefulSets. (kubernetes/kubernetes#100842, @ravisantoshgudimetla) [SIG API Machinery, Apps and Testing]

  • Kube-controller-manger: the --horizontal-pod-autoscaler-use-rest-clients flag and Heapster support in the horizontal pod autoscaler, deprecated since 1.12, is removed. (kubernetes/kubernetes#90368, @serathius) [SIG API Machinery, Apps, Autoscaling, Cloud Provider and Instrumentation]

  • The deprecated flag --algorithm-provider has been removed from kube-scheduler. Use instead ComponentConfig to configure the set of enabled plugins (kubernetes/kubernetes#102239, @Haleygo) [SIG Cloud Provider and Scheduling]

  • Add alpha support for HostProcess containers on Windows (kubernetes/kubernetes#99576, @marosset) [SIG API Machinery, Apps, Node, Testing and Windows]

  • Add three metrics to job controller to monitor if Job works in a healthy condition. IndexedJob promoted to Beta (kubernetes/kubernetes#101292, @AliceZhang2016) [SIG Apps, Instrumentation and Testing]

  • Corrected the documentation for escaping dollar signs in a container's env, command and args property. (kubernetes/kubernetes#101916, @MartinKanters) [SIG Apps]

  • Omit comparison with boolean constant (kubernetes/kubernetes#101523, @GreenApple10) [SIG CLI and Cloud Provider]

  • Pod Affinity NamespaceSelector and the associated CrossNamespaceAffinity quota scope graduated to beta (kubernetes/kubernetes#101496, @ahg-g) [SIG API Machinery, Apps and Testing]

  • V1.Node .status.images[].names is now optional (kubernetes/kubernetes#102159, @roycaihw) [SIG Apps and Node]

  • "Auto" is now a valid value for the service.kubernetes.io/topology-aware-hints annotation. (kubernetes/kubernetes#100728, @robscott) [SIG Apps, Instrumentation and Network]

  • Kube-apiserver: --service-account-issuer can be specified multiple times now, to enable non-disruptive change of issuer. (kubernetes/kubernetes#101155, @zshihang) [SIG API Machinery, Auth, Node and Testing]

  • New "node-high" priority-level has been added to Suggested API Priority and Fairness configuration. (kubernetes/kubernetes#101151, @mborsz) [SIG API Machinery]

  • PodDeletionCost promoted to Beta (kubernetes/kubernetes#101080, @ahg-g) [SIG Apps]

  • SSA treats certain structs as atomic (kubernetes/kubernetes#100684, @Jefftree) [SIG API Machinery, Auth, Node and Storage]

  • Server Side Apply now treats all Selector fields as atomic (meaning the entire selector is managed by a single writer and updated together), since they contain interrelated and inseparable fields that do not merge in intuitive ways. (kubernetes/kubernetes#97989, @Danil-Grigorev) [SIG API Machinery]

  • The pods/ephemeralcontainers API now returns and expects a Pod object instead of EphemeralContainers. This is incompatible with the previous alpha-level API. (kubernetes/kubernetes#101034, @verb) [SIG Apps, Auth, CLI and Testing]

  • The pod/eviction subresource now accepts policy/v1 Eviction requests in addition to policy/v1beta1 Eviction requests (kubernetes/kubernetes#100724, @liggitt) [SIG API Machinery, Apps, Architecture, Auth, CLI, Storage and Testing]

  • Track ownership of scale subresource for all scalable resources i.e. Deployment, ReplicaSet, StatefulSet, ReplicationController, and Custom Resources. (kubernetes/kubernetes#98377, @nodo) [SIG API Machinery and Testing]

  • We have added a new Priority & Fairness rule that exempts all probes (/readyz, /healthz, /livez) to prevent restarting of "healthy" kube-apiserver instance(s) by kubelet. (kubernetes/kubernetes#100678, @tkashem) [SIG API Machinery]

v21.7.0

Kubernetes API Version: v1.21.7

Bug or Regression

  • Fixed kubernetes-client#741, an issue which prevented Kubernetes cluster api-tokens from exec-plugin auth providers from being refreshed after expiry. (#250, @emenendez)
  • Use select.poll() for exec on linux/darwin to improve scalability of WSClient (#268, @jsun-splunk)

v21.7.0b1

Kubernetes API Version: v1.21.7

v21.7.0a1

Kubernetes API Version: v1.21.7

API Change

  • Kube-apiserver: Fixes handling of CRD schemas containing literal null values in enums (#104989, @liggitt) [SIG API Machinery, Apps and Network]
  • "Auto" is now a valid value for the service.kubernetes.io/topology-aware-hints annotation. (kubernetes/kubernetes#100728, @robscott) [SIG Apps, Instrumentation and Network]
  • We have added a new Priority & Fairness rule that exempts all probes (/readyz, /healthz, /livez) to prevent restarting of "healthy" kube-apiserver instance(s) by kubelet. (kubernetes/kubernetes#101111, @tkashem) [SIG API Machinery]
    1. PodAffinityTerm includes a namespaceSelector field to allow selecting eligible namespaces based on their labels.
    2. A new CrossNamespacePodAffinity quota scope API that allows restricting which namespaces allowed to use PodAffinityTerm with corss-namespace reference via namespaceSelector or namespaces fields. (kubernetes/kubernetes#98582, @ahg-g) [SIG API Machinery, Apps, Auth and Testing]
  • Add Probe-level terminationGracePeriodSeconds field (kubernetes/kubernetes#99375, @ehashman) [SIG API Machinery, Apps, Node and Testing]
  • Added .spec.completionMode field to Job, with accepted values NonIndexed (default) and Indexed. This is an alpha field and is only honored by servers with the IndexedJob feature gate enabled. (kubernetes/kubernetes#98441, @alculquicondor) [SIG Apps and CLI]
  • Adds support for endPort field in NetworkPolicy (kubernetes/kubernetes#97058, @rikatz) [SIG Apps and Network]
  • CSIServiceAccountToken graduates to Beta and enabled by default. (kubernetes/kubernetes#99298, @zshihang)
  • Cluster admins can now turn off /debug/pprof and /debug/flags/v endpoint in kubelet by setting enableProfilingHandler and enableDebugFlagsHandler to false in the Kubelet configuration file. Options enableProfilingHandler and enableDebugFlagsHandler can be set to true only when enableDebuggingHandlers is also set to true. (kubernetes/kubernetes#98458, @SaranBalaji90)
  • DaemonSets accept a MaxSurge integer or percent on their rolling update strategy that will launch the updated pod on nodes and wait for those pods to go ready before marking the old out-of-date pods as deleted. This allows workloads to avoid downtime during upgrades when deployed using DaemonSets. This feature is alpha and is behind the DaemonSetUpdateSurge feature gate. (kubernetes/kubernetes#96441, @smarterclayton) [SIG Apps and Testing]
  • Enable SPDY pings to keep connections alive, so that kubectl exec and kubectl portforward won't be interrupted. (kubernetes/kubernetes#97083, @knight42) [SIG API Machinery and CLI]
  • FieldManager no longer owns fields that get reset before the object is persisted (e.g. "status wiping"). (kubernetes/kubernetes#99661, @kevindelgado) [SIG API Machinery, Auth and Testing]
  • Fixes server-side apply for APIService resources. (kubernetes/kubernetes#98576, @kevindelgado)
  • Generic ephemeral volumes are beta. (kubernetes/kubernetes#99643, @pohly) [SIG API Machinery, Apps, Auth, CLI, Node, Storage and Testing]
  • Hugepages request values are limited to integer multiples of the page size. (kubernetes/kubernetes#98515, @lala123912) [SIG Apps]
  • Implement the GetAvailableResources in the podresources API. (kubernetes/kubernetes#95734, @fromanirh) [SIG Instrumentation, Node and Testing]
  • IngressClass resource can now reference a resource in a specific namespace for implementation-specific configuration (previously only Cluster-level resources were allowed). This feature can be enabled using the IngressClassNamespacedParams feature gate. (kubernetes/kubernetes#99275, @hbagdi)
  • Jobs API has a new .spec.suspend field that can be used to suspend and resume Jobs. This is an alpha field which is only honored by servers with the SuspendJob feature gate enabled. (kubernetes/kubernetes#98727, @adtac)
  • Kubelet Graceful Node Shutdown feature graduates to Beta and enabled by default. (kubernetes/kubernetes#99735, @bobbypage)
  • Kubernetes is now built using go1.15.7 (kubernetes/kubernetes#98363, @cpanato) [SIG Cloud Provider, Instrumentation, Node, Release and Testing]
  • Namespace API objects now have a kubernetes.io/metadata.name label matching their metadata.name field to allow selecting any namespace by its name using a label selector. (kubernetes/kubernetes#96968, @jayunit100) [SIG API Machinery, Apps, Cloud Provider, Storage and Testing]
  • One new field "InternalTrafficPolicy" in Service is added. It specifies if the cluster internal traffic should be routed to all endpoints or node-local endpoints only. "Cluster" routes internal traffic to a Service to all endpoints. "Local" routes traffic to node-local endpoints only, and traffic is dropped if no node-local endpoints are ready. The default value is "Cluster". (kubernetes/kubernetes#96600, @maplain) [SIG API Machinery, Apps and Network]
  • PodDisruptionBudget API objects can now contain conditions in status. (kubernetes/kubernetes#98127, @mortent) [SIG API Machinery, Apps, Auth, CLI, Cloud Provider, Cluster Lifecycle and Instrumentation]
  • PodSecurityPolicy only stores "generic" as allowed volume type if the GenericEphemeralVolume feature gate is enabled (kubernetes/kubernetes#98918, @pohly) [SIG Auth and Security]
  • Promote CronJobs to batch/v1 (kubernetes/kubernetes#99423, @soltysh) [SIG API Machinery, Apps, CLI and Testing]
  • Promote Immutable Secrets/ConfigMaps feature to Stable. This allows to set immutable field in Secret or ConfigMap object to mark their contents as immutable. (kubernetes/kubernetes#97615, @wojtek-t) [SIG Apps, Architecture, Node and Testing]
  • Remove support for building Kubernetes with bazel. (kubernetes/kubernetes#99561, @BenTheElder) [SIG API Machinery, Apps, Architecture, Auth, Autoscaling, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Release, Scalability, Scheduling, Storage, Testing and Windows]
  • Scheduler extender filter interface now can report unresolvable failed nodes in the new field FailedAndUnresolvableNodes of ExtenderFilterResult struct. Nodes in this map will be skipped in the preemption phase. (kubernetes/kubernetes#92866, @cofyc) [SIG Scheduling]
  • Services can specify loadBalancerClass to use a custom load balancer (kubernetes/kubernetes#98277, @XudongLiuHarold)
  • Storage capacity tracking (= the CSIStorageCapacity feature) graduates to Beta and enabled by default, storage.k8s.io/v1alpha1/VolumeAttachment and storage.k8s.io/v1alpha1/CSIStorageCapacity objects are deprecated (kubernetes/kubernetes#99641, @pohly)
  • Support for Indexed Job: a Job that is considered completed when Pods associated to indexes from 0 to (.spec.completions-1) have succeeded. (kubernetes/kubernetes#98812, @alculquicondor) [SIG Apps and CLI]
  • The BoundServiceAccountTokenVolume feature has been promoted to beta, and enabled by default.
    • This changes the tokens provided to containers at /var/run/secrets/kubernetes.io/serviceaccount/token to be time-limited, auto-refreshed, and invalidated when the containing pod is deleted.
    • Clients should reload the token from disk periodically (once per minute is recommended) to ensure they continue to use a valid token. k8s.io/client-go version v11.0.0+ and v0.15.0+ reload tokens automatically.
    • By default, injected tokens are given an extended lifetime so they remain valid even after a new refreshed token is provided. The metric serviceaccount_stale_tokens_total can be used to monitor for workloads that are depending on the extended lifetime and are continuing to use tokens even after a refreshed token is provided to the container. If that metric indicates no existing workloads are depending on extended lifetimes, injected token lifetime can be shortened to 1 hour by starting kube-apiserver with --service-account-extend-token-expiration=false. (kubernetes/kubernetes#95667, @zshihang) [SIG API Machinery, Auth, Cluster Lifecycle and Testing]
  • The EndpointSlice Controllers are now GA. The EndpointSliceController will not populate the deprecatedTopology field and will only provide topology information through the zone and nodeName fields. (kubernetes/kubernetes#99870, @swetharepakula)
  • The Endpoints controller will now set the endpoints.kubernetes.io/over-capacity annotation to "warning" when an Endpoints resource contains more than 1000 addresses. In a future release, the controller will truncate Endpoints that exceed this limit. The EndpointSlice API can be used to support significantly larger number of addresses. (kubernetes/kubernetes#99975, @robscott) [SIG Apps and Network]
  • The PodDisruptionBudget API has been promoted to policy/v1 with no schema changes. The only functional change is that an empty selector ({}) written to a policy/v1 PodDisruptionBudget now selects all pods in the namespace. The behavior of the policy/v1beta1 API remains unchanged. The policy/v1beta1 PodDisruptionBudget API is deprecated and will no longer be served in 1.25+. (kubernetes/kubernetes#99290, @mortent) [SIG API Machinery, Apps, Auth, Autoscaling, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Scheduling and Testing]
  • The EndpointSlice API is now GA. The EndpointSlice topology field has been removed from the GA API and will be replaced by a new per Endpoint Zone field. If the topology field was previously used, it will be converted into an annotation in the v1 Resource. The discovery.k8s.io/v1alpha1 API is removed. (kubernetes/kubernetes#99662, @swetharepakula)
  • The controller.kubernetes.io/pod-deletion-cost annotation can be set to offer a hint on the cost of deleting a Pod compared to other pods belonging to the same ReplicaSet. Pods with lower deletion cost are deleted first. This is an alpha feature. (kubernetes/kubernetes#99163, @ahg-g)
  • The kube-apiserver now resets managedFields that got corrupted by a mutating admission controller. (kubernetes/kubernetes#98074, @kwiesmueller)
  • Topology Aware Hints are now available in alpha and can be enabled with the TopologyAwareHints feature gate. (kubernetes/kubernetes#99522, @robscott) [SIG API Machinery, Apps, Auth, Instrumentation, Network and Testing]
  • Users might specify the kubectl.kubernetes.io/default-exec-container annotation in a Pod to preselect container for kubectl commands. (kubernetes/kubernetes#97099, @pacoxu) [SIG CLI]
  • Add Probe-level terminationGracePeriodSeconds field (kubernetes/kubernetes#99375, @ehashman) [SIG API Machinery, Apps, Node and Testing]
  • CSIServiceAccountToken is Beta now (kubernetes/kubernetes#99298, @zshihang) [SIG Auth, Storage and Testing]
  • Discovery.k8s.io/v1beta1 EndpointSlices are deprecated in favor of discovery.k8s.io/v1, and will no longer be served in Kubernetes v1.25. (kubernetes/kubernetes#100472, @liggitt) [SIG Network]
  • FieldManager no longer owns fields that get reset before the object is persisted (e.g. "status wiping"). (kubernetes/kubernetes#99661, @kevindelgado) [SIG API Machinery, Auth and Testing]
  • Generic ephemeral volumes are beta. (kubernetes/kubernetes#99643, @pohly) [SIG API Machinery, Apps, Auth, CLI, Node, Storage and Testing]
  • Implement the GetAvailableResources in the podresources API. (kubernetes/kubernetes#95734, @fromanirh) [SIG Instrumentation, Node and Testing]
  • The Endpoints controller will now set the endpoints.kubernetes.io/over-capacity annotation to "warning" when an Endpoints resource contains more than 1000 addresses. In a future release, the controller will truncate Endpoints that exceed this limit. The EndpointSlice API can be used to support significantly larger number of addresses. (kubernetes/kubernetes#99975, @robscott) [SIG Apps and Network]
  • The PodDisruptionBudget API has been promoted to policy/v1 with no schema changes. The only functional change is that an empty selector ({}) written to a policy/v1 PodDisruptionBudget now selects all pods in the namespace. The behavior of the policy/v1beta1 API remains unchanged. The policy/v1beta1 PodDisruptionBudget API is deprecated and will no longer be served in 1.25+. (kubernetes/kubernetes#99290, @mortent) [SIG API Machinery, Apps, Auth, Autoscaling, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Scheduling and Testing]
  • Topology Aware Hints are now available in alpha and can be enabled with the TopologyAwareHints feature gate. (kubernetes/kubernetes#99522, @robscott) [SIG API Machinery, Apps, Auth, Instrumentation, Network and Testing]
    1. PodAffinityTerm includes a namespaceSelector field to allow selecting eligible namespaces based on their labels.
    2. A new CrossNamespacePodAffinity quota scope API that allows restricting which namespaces allowed to use PodAffinityTerm with corss-namespace reference via namespaceSelector or namespaces fields. (kubernetes/kubernetes#98582, @ahg-g) [SIG API Machinery, Apps, Auth and Testing]
  • Add a default metadata name labels for selecting any namespace by its name. (kubernetes/kubernetes#96968, @jayunit100) [SIG API Machinery, Apps, Cloud Provider, Storage and Testing]
  • Added .spec.completionMode field to Job, with accepted values NonIndexed (default) and Indexed (kubernetes/kubernetes#98441, @alculquicondor) [SIG Apps and CLI]
  • Clarified NetworkPolicy policyTypes documentation (kubernetes/kubernetes#97216, @joejulian) [SIG Network]
  • DaemonSets accept a MaxSurge integer or percent on their rolling update strategy that will launch the updated pod on nodes and wait for those pods to go ready before marking the old out-of-date pods as deleted. This allows workloads to avoid downtime during upgrades when deployed using DaemonSets. This feature is alpha and is behind the DaemonSetUpdateSurge feature gate. (kubernetes/kubernetes#96441, @smarterclayton) [SIG Apps and Testing]
  • EndpointSlice API is now GA. The EndpointSlice topology field has been removed from the GA API and will be replaced by a new per Endpoint Zone field. If the topology field was previously used, it will be converted into an annotation in the v1 Resource. The discovery.k8s.io/v1alpha1 API is removed. (kubernetes/kubernetes#99662, @swetharepakula) [SIG API Machinery, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network and Testing]
  • EndpointSlice Controllers are now GA. The EndpointSlice Controller will not populate the deprecatedTopology field and will only provide topology information through the zone and nodeName fields. (kubernetes/kubernetes#99870, @swetharepakula) [SIG API Machinery, Apps, Auth, Network and Testing]
  • IngressClass resource can now reference a resource in a specific namespace for implementation-specific configuration(previously only Cluster-level resources were allowed). This feature can be enabled using the IngressClassNamespacedParams feature gate. (kubernetes/kubernetes#99275, @hbagdi) [SIG API Machinery, CLI and Network]
  • Introduce conditions for PodDisruptionBudget (kubernetes/kubernetes#98127, @mortent) [SIG API Machinery, Apps, Auth, CLI, Cloud Provider, Cluster Lifecycle and Instrumentation]
  • Jobs API has a new .spec.suspend field that can be used to suspend and resume Jobs (kubernetes/kubernetes#98727, @adtac) [SIG API Machinery, Apps, Node, Scheduling and Testing]
  • Kubelet Graceful Node Shutdown feature is now beta. (kubernetes/kubernetes#99735, @bobbypage) [SIG Node]
  • Limit the quest value of hugepage to integer multiple of page size. (kubernetes/kubernetes#98515, @lala123912) [SIG Apps]
  • One new field "InternalTrafficPolicy" in Service is added. It specifies if the cluster internal traffic should be routed to all endpoints or node-local endpoints only. "Cluster" routes internal traffic to a Service to all endpoints. "Local" routes traffic to node-local endpoints only, and traffic is dropped if no node-local endpoints are ready. The default value is "Cluster". (kubernetes/kubernetes#96600, @maplain) [SIG API Machinery, Apps and Network]
  • PodSecurityPolicy only stores "generic" as allowed volume type if the GenericEphemeralVolume feature gate is enabled (kubernetes/kubernetes#98918, @pohly) [SIG Auth and Security]
  • Promote CronJobs to batch/v1 (kubernetes/kubernetes#99423, @soltysh) [SIG API Machinery, Apps, CLI and Testing]
  • Remove support for building Kubernetes with bazel. (kubernetes/kubernetes#99561, @BenTheElder) [SIG API Machinery, Apps, Architecture, Auth, Autoscaling, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Release, Scalability, Scheduling, Storage, Testing and Windows]
  • Setting loadBalancerClass in load balancer type of service is available with this PR. Users who want to use a custom load balancer can specify loadBalancerClass to achieve it. (kubernetes/kubernetes#98277, @XudongLiuHarold) [SIG API Machinery, Apps, Cloud Provider and Network]
  • Storage capacity tracking (= the CSIStorageCapacity feature) is beta, storage.k8s.io/v1alpha1/VolumeAttachment and storage.k8s.io/v1alpha1/CSIStorageCapacity objects are deprecated (kubernetes/kubernetes#99641, @pohly) [SIG API Machinery, Apps, Auth, Scheduling, Storage and Testing]
  • Support for Indexed Job: a Job that is considered completed when Pods associated to indexes from 0 to (.spec.completions-1) have succeeded. (kubernetes/kubernetes#98812, @alculquicondor) [SIG Apps and CLI]
  • The apiserver now resets managedFields that got corrupted by a mutating admission controller. (kubernetes/kubernetes#98074, @kwiesmueller) [SIG API Machinery and Testing]
  • controller.kubernetes.io/pod-deletion-cost annotation can be set to offer a hint on the cost of deleting a pod compared to other pods belonging to the same ReplicaSet. Pods with lower deletion cost are deleted first. This is an alpha feature. (kubernetes/kubernetes#99163, @ahg-g) [SIG Apps]
  • Cluster admins can now turn off /debug/pprof and /debug/flags/v endpoint in kubelet by setting enableProfilingHandler and enableDebugFlagsHandler to false in their kubelet configuration file. enableProfilingHandler and enableDebugFlagsHandler can be set to true only when enableDebuggingHandlers is also set to true. (kubernetes/kubernetes#98458, @SaranBalaji90) [SIG Node]
  • The BoundServiceAccountTokenVolume feature has been promoted to beta, and enabled by default.
    • This changes the tokens provided to containers at /var/run/secrets/kubernetes.io/serviceaccount/token to be time-limited, auto-refreshed, and invalidated when the containing pod is deleted.
    • Clients should reload the token from disk periodically (once per minute is recommended) to ensure they continue to use a valid token. k8s.io/client-go version v11.0.0+ and v0.15.0+ reload tokens automatically.
    • By default, injected tokens are given an extended lifetime so they remain valid even after a new refreshed token is provided. The metric serviceaccount_stale_tokens_total can be used to monitor for workloads that are depending on the extended lifetime and are continuing to use tokens even after a refreshed token is provided to the container. If that metric indicates no existing workloads are depending on extended lifetimes, injected token lifetime can be shortened to 1 hour by starting kube-apiserver with --service-account-extend-token-expiration=false. (kubernetes/kubernetes#95667, @zshihang) [SIG API Machinery, Auth, Cluster Lifecycle and Testing]
  • Adds support for portRange / EndPort in Network Policy (kubernetes/kubernetes#97058, @rikatz) [SIG Apps and Network]
  • Fixes using server-side apply with APIService resources (kubernetes/kubernetes#98576, @kevindelgado) [SIG API Machinery, Apps and Testing]
  • Kubernetes is now built using go1.15.7 (kubernetes/kubernetes#98363, @cpanato) [SIG Cloud Provider, Instrumentation, Node, Release and Testing]
  • Scheduler extender filter interface now can report unresolvable failed nodes in the new field FailedAndUnresolvableNodes of ExtenderFilterResult struct. Nodes in this map will be skipped in the preemption phase. (kubernetes/kubernetes#92866, @cofyc) [SIG Scheduling]
  • Enable SPDY pings to keep connections alive, so that kubectl exec and kubectl port-forward won't be interrupted. (kubernetes/kubernetes#97083, @knight42) [SIG API Machinery and CLI]
  • Change the APIVersion proto name of BoundObjectRef from aPIVersion to apiVersion. (kubernetes/kubernetes#97379, @kebe7jun) [SIG Auth]
  • Promote Immutable Secrets/ConfigMaps feature to Stable. This allows to set Immutable field in Secrets or ConfigMap object to mark their contents as immutable. (kubernetes/kubernetes#97615, @wojtek-t) [SIG Apps, Architecture, Node and Testing]

v20.13.0

Kubernetes API Version: v1.20.13

v20.12.0b1

Kubernetes API Version: v1.20.12

API Change

  • Kube-apiserver: Fixes handling of CRD schemas containing literal null values in enums (#104990, @liggitt) [SIG API Machinery, Apps and Network]

v20.11.0a1

Kubernetes API Version: v1.20.11

API Change

  • We have added a new Priority & Fairness rule that exempts all probes (/readyz, /healthz, /livez) to prevent restarting of "healthy" kube-apiserver instance(s) by kubelet. (kubernetes/kubernetes#101112, @tkashem) [SIG API Machinery]

  • Fixes using server-side apply with APIService resources (kubernetes/kubernetes#100714, @kevindelgado) [SIG API Machinery, Apps and Testing]

  • Regenerate protobuf code to fix CVE-2021-3121 (kubernetes/kubernetes#100501, @joelsmith) [SIG API Machinery, Apps, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Node and Storage]

  • Kubernetes is now built using go1.15.8 (kubernetes/kubernetes#98962, @cpanato) [SIG Cloud Provider, Instrumentation, Release and Testing]

  • TokenRequest and TokenRequestProjection features have been promoted to GA. This feature allows generating service account tokens that are not visible in Secret objects and are tied to the lifetime of a Pod object. See https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/#service-account-token-volume-projection for details on configuring and using this feature. The TokenRequest and TokenRequestProjection feature gates will be removed in v1.21.

    • kubeadm's kube-apiserver Pod manifest now includes the following flags by default "--service-account-key-file", "--service-account-signing-key-file", "--service-account-issuer". (kubernetes/kubernetes#93258, @zshihang) [SIG API Machinery, Auth, Cluster Lifecycle, Storage and Testing]

  • A new nofuzz go build tag now disables gofuzz support. Release binaries enable this. (kubernetes/kubernetes#92491, @BenTheElder) [SIG API Machinery]

  • Add WindowsContainerResources and Annotations to CRI-API UpdateContainerResourcesRequest (kubernetes/kubernetes#95741, @katiewasnothere) [SIG Node]

  • Add a serving and terminating condition to the EndpointSlice API. serving tracks the readiness of endpoints regardless of their terminating state. This is distinct from ready since ready is only true when pods are not terminating. terminating is true when an endpoint is terminating. For pods this is any endpoint with a deletion timestamp. (kubernetes/kubernetes#92968, @andrewsykim) [SIG Apps and Network]

  • Add dual-stack Services (alpha). This is a BREAKING CHANGE to an alpha API. It changes the dual-stack API wrt Service from a single ipFamily field to 3 fields: ipFamilyPolicy (SingleStack, PreferDualStack, RequireDualStack), ipFamilies (a list of families assigned), and clusterIPs (inclusive of clusterIP). Most users do not need to set anything at all, defaulting will handle it for them. Services are single-stack unless the user asks for dual-stack. This is all gated by the "IPv6DualStack" feature gate. (kubernetes/kubernetes#91824, @khenidak) [SIG API Machinery, Apps, CLI, Network, Node, Scheduling and Testing]

  • Add support for hugepages to downward API (kubernetes/kubernetes#86102, @derekwaynecarr) [SIG API Machinery, Apps, CLI, Network, Node, Scheduling and Testing]

  • Adds kubelet alpha feature, GracefulNodeShutdown which makes kubelet aware of node system shutdowns and result in graceful termination of pods during a system shutdown. (kubernetes/kubernetes#96129, @bobbypage) [SIG Node]

  • AppProtocol is now GA for Endpoints and Services. The ServiceAppProtocol feature gate will be deprecated in 1.21. (kubernetes/kubernetes#96327, @robscott) [SIG Apps and Network]

  • Automatic allocation of NodePorts for services with type LoadBalancer can now be disabled by setting the (new) parameter Service.spec.allocateLoadBalancerNodePorts=false. The default is to allocate NodePorts for services with type LoadBalancer which is the existing behavior. (kubernetes/kubernetes#92744, @uablrek) [SIG Apps and Network]

  • Certain fields on Service objects will be automatically cleared when changing the service's type to a mode that does not need those fields. For example, changing from type=LoadBalancer to type=ClusterIP will clear the NodePort assignments, rather than forcing the user to clear them. (kubernetes/kubernetes#95196, @thockin) [SIG API Machinery, Apps, Network and Testing]

  • Document that ServiceTopology feature is required to use service.spec.topologyKeys. (kubernetes/kubernetes#96528, @andrewsykim) [SIG Apps]

  • EndpointSlice has a new NodeName field guarded by the EndpointSliceNodeName feature gate.

    • EndpointSlice topology field will be deprecated in an upcoming release.
    • EndpointSlice "IP" address type is formally removed after being deprecated in Kubernetes 1.17.
    • The discovery.k8s.io/v1alpha1 API is deprecated and will be removed in Kubernetes 1.21. (kubernetes/kubernetes#96440, @robscott) [SIG API Machinery, Apps and Network]

  • External facing API podresources is now available under k8s.io/kubelet/pkg/apis/ (kubernetes/kubernetes#92632, @RenaudWasTaken) [SIG Node and Testing]

  • Fewer candidates are enumerated for preemption to improve performance in large clusters. (kubernetes/kubernetes#94814, @adtac)

  • Fix conversions for custom metrics. (kubernetes/kubernetes#94481, @wojtek-t) [SIG API Machinery and Instrumentation]

  • GPU metrics provided by kubelet are now disabled by default. (kubernetes/kubernetes#95184, @RenaudWasTaken)

  • If BoundServiceAccountTokenVolume is enabled, cluster admins can use metric serviceaccount_stale_tokens_total to monitor workloads that are depending on the extended tokens. If there are no such workloads, turn off extended tokens by starting kube-apiserver with flag --service-account-extend-token-expiration=false (kubernetes/kubernetes#96273, @zshihang) [SIG API Machinery and Auth]

  • Introduce alpha support for exec-based container registry credential provider plugins in the kubelet. (kubernetes/kubernetes#94196, @andrewsykim) [SIG Node and Release]

  • Introduces a metric source for HPAs which allows scaling based on container resource usage. (kubernetes/kubernetes#90691, @arjunrn) [SIG API Machinery, Apps, Autoscaling and CLI]

  • Kube-apiserver now deletes expired kube-apiserver Lease objects:

    • The feature is under feature gate APIServerIdentity.
    • A flag is added to kube-apiserver: identity-lease-garbage-collection-check-period-seconds (kubernetes/kubernetes#95895, @roycaihw) [SIG API Machinery, Apps, Auth and Testing]

  • Kube-controller-manager: volume plugins can be restricted from contacting local and loopback addresses by setting --volume-host-allow-local-loopback=false, or from contacting specific CIDR ranges by setting --volume-host-cidr-denylist (for example, --volume-host-cidr-denylist=127.0.0.1/28,feed::/16) (kubernetes/kubernetes#91785, @mattcary) [SIG API Machinery, Apps, Auth, CLI, Network, Node, Storage and Testing]

  • Migrate scheduler, controller-manager and cloud-controller-manager to use LeaseLock (kubernetes/kubernetes#94603, @wojtek-t) [SIG API Machinery, Apps, Cloud Provider and Scheduling]

  • Modify DNS-1123 error messages to indicate that RFC 1123 is not followed exactly (kubernetes/kubernetes#94182, @mattfenwick) [SIG API Machinery, Apps, Auth, Network and Node]

  • Move configurable fsgroup change policy for pods to beta (kubernetes/kubernetes#96376, @gnufied) [SIG Apps and Storage]

  • New flag is introduced, i.e. --topology-manager-scope=container|pod. The default value is the "container" scope. (kubernetes/kubernetes#92967, @cezaryzukowski) [SIG Instrumentation, Node and Testing]

  • New parameter defaultingType for PodTopologySpread plugin allows to use k8s defined or user provided default constraints (kubernetes/kubernetes#95048, @alculquicondor) [SIG Scheduling]

  • NodeAffinity plugin can be configured with AddedAffinity. (kubernetes/kubernetes#96202, @alculquicondor) [SIG Node, Scheduling and Testing]

  • Promote RuntimeClass feature to GA. Promote node.k8s.io API groups from v1beta1 to v1. (kubernetes/kubernetes#95718, @SergeyKanzhelev) [SIG Apps, Auth, Node, Scheduling and Testing]

  • Reminder: The labels "failure-domain.beta.kubernetes.io/zone" and "failure-domain.beta.kubernetes.io/region" are deprecated in favor of "topology.kubernetes.io/zone" and "topology.kubernetes.io/region" respectively. All users of the "failure-domain.beta..." labels should switch to the "topology..." equivalents. (kubernetes/kubernetes#96033, @thockin) [SIG API Machinery, Apps, CLI, Cloud Provider, Network, Node, Scheduling, Storage and Testing]

  • Server Side Apply now treats LabelSelector fields as atomic (meaning the entire selector is managed by a single writer and updated together), since they contain interrelated and inseparable fields that do not merge in intuitive ways. (kubernetes/kubernetes#93901, @jpbetz) [SIG API Machinery, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Storage and Testing]

  • Services will now have a clusterIPs field to go with clusterIP. clusterIPs[0] is a synonym for clusterIP and will be synchronized on create and update operations. (kubernetes/kubernetes#95894, @thockin) [SIG Network]

  • The ServiceAccountIssuerDiscovery feature gate is now Beta and enabled by default. (kubernetes/kubernetes#91921, @mtaufen) [SIG Auth]

  • The status of v1beta1 CRDs without "preserveUnknownFields:false" now shows a violation, "spec.preserveUnknownFields: Invalid value: true: must be false". (kubernetes/kubernetes#93078, @vareti)

  • The usage of mixed protocol values in the same LoadBalancer Service is possible if the new feature gate MixedProtocolLBService is enabled. The feature gate is disabled by default. The user has to enable it for the API Server. (kubernetes/kubernetes#94028, @janosi) [SIG API Machinery and Apps]

  • This PR will introduce a feature gate CSIServiceAccountToken with two additional fields in CSIDriverSpec. (kubernetes/kubernetes#93130, @zshihang) [SIG API Machinery, Apps, Auth, CLI, Network, Node, Storage and Testing]

  • Users can try the CronJob controller v2 using the feature gate. This will be the default controller in future releases. (kubernetes/kubernetes#93370, @alaypatel07) [SIG API Machinery, Apps, Auth and Testing]

  • VolumeSnapshotDataSource moves to GA in 1.20 release (kubernetes/kubernetes#95282, @xing-yang) [SIG Apps]

  • WinOverlay feature graduated to beta (kubernetes/kubernetes#94807, @ksubrmnn) [SIG Windows]

  • API priority and fairness graduated to beta 1.19 servers with APF turned on should not be run in a multi-server cluster with 1.20+ servers. (kubernetes/kubernetes#96527, @adtac) [SIG API Machinery and Testing]

  • Add LoadBalancerIPMode feature gate (kubernetes/kubernetes#92312, @Sh4d1) [SIG Apps, CLI, Cloud Provider and Network]

  • Add WindowsContainerResources and Annotations to CRI-API UpdateContainerResourcesRequest (kubernetes/kubernetes#95741, @katiewasnothere) [SIG Node]

  • Add a 'serving' and terminating condition to the EndpointSlice API.

    serving tracks the readiness of endpoints regardless of their terminating state. This is distinct from ready since ready is only true when pods are not terminating. terminating is true when an endpoint is terminating. For pods this is any endpoint with a deletion timestamp. (kubernetes/kubernetes#92968, @andrewsykim) [SIG Apps and Network]

  • Add support for hugepages to downward API (kubernetes/kubernetes#86102, @derekwaynecarr) [SIG API Machinery, Apps, CLI, Network, Node, Scheduling and Testing]

  • Adds kubelet alpha feature, GracefulNodeShutdown which makes kubelet aware of node system shutdowns and result in graceful termination of pods during a system shutdown. (kubernetes/kubernetes#96129, @bobbypage) [SIG Node]

  • AppProtocol is now GA for Endpoints and Services. The ServiceAppProtocol feature gate will be deprecated in 1.21. (kubernetes/kubernetes#96327, @robscott) [SIG Apps and Network]

  • Automatic allocation of NodePorts for services with type LoadBalancer can now be disabled by setting the (new) parameter Service.spec.allocateLoadBalancerNodePorts=false. The default is to allocate NodePorts for services with type LoadBalancer which is the existing behavior. (kubernetes/kubernetes#92744, @uablrek) [SIG Apps and Network]

  • Document that ServiceTopology feature is required to use service.spec.topologyKeys. (kubernetes/kubernetes#96528, @andrewsykim) [SIG Apps]

  • EndpointSlice has a new NodeName field guarded by the EndpointSliceNodeName feature gate.

    • EndpointSlice topology field will be deprecated in an upcoming release.
    • EndpointSlice "IP" address type is formally removed after being deprecated in Kubernetes 1.17.
    • The discovery.k8s.io/v1alpha1 API is deprecated and will be removed in Kubernetes 1.21. (kubernetes/kubernetes#96440, @robscott) [SIG API Machinery, Apps and Network]

  • Fewer candidates are enumerated for preemption to improve performance in large clusters (kubernetes/kubernetes#94814, @adtac) [SIG Scheduling]

  • If BoundServiceAccountTokenVolume is enabled, cluster admins can use metric serviceaccount_stale_tokens_total to monitor workloads that are depending on the extended tokens. If there are no such workloads, turn off extended tokens by starting kube-apiserver with flag --service-account-extend-token-expiration=false (kubernetes/kubernetes#96273, @zshihang) [SIG API Machinery and Auth]

  • Introduce alpha support for exec-based container registry credential provider plugins in the kubelet. (kubernetes/kubernetes#94196, @andrewsykim) [SIG Node and Release]

  • Kube-apiserver now deletes expired kube-apiserver Lease objects:

    • The feature is under feature gate APIServerIdentity.
    • A flag is added to kube-apiserver: identity-lease-garbage-collection-check-period-seconds (kubernetes/kubernetes#95895, @roycaihw) [SIG API Machinery, Apps, Auth and Testing]

  • Move configurable fsgroup change policy for pods to beta (kubernetes/kubernetes#96376, @gnufied) [SIG Apps and Storage]

  • New flag is introduced, i.e. --topology-manager-scope=container|pod. The default value is the "container" scope. (kubernetes/kubernetes#92967, @cezaryzukowski) [SIG Instrumentation, Node and Testing]

  • NodeAffinity plugin can be configured with AddedAffinity. (kubernetes/kubernetes#96202, @alculquicondor) [SIG Node, Scheduling and Testing]

  • Promote RuntimeClass feature to GA. Promote node.k8s.io API groups from v1beta1 to v1. (kubernetes/kubernetes#95718, @SergeyKanzhelev) [SIG Apps, Auth, Node, Scheduling and Testing]

  • Reminder: The labels "failure-domain.beta.kubernetes.io/zone" and "failure-domain.beta.kubernetes.io/region" are deprecated in favor of "topology.kubernetes.io/zone" and "topology.kubernetes.io/region" respectively. All users of the "failure-domain.beta..." labels should switch to the "topology..." equivalents. (kubernetes/kubernetes#96033, @thockin) [SIG API Machinery, Apps, CLI, Cloud Provider, Network, Node, Scheduling, Storage and Testing]

  • The usage of mixed protocol values in the same LoadBalancer Service is possible if the new feature gate MixedProtocolLBSVC is enabled. "action required" The feature gate is disabled by default. The user has to enable it for the API Server. (kubernetes/kubernetes#94028, @janosi) [SIG API Machinery and Apps]

  • This PR will introduce a feature gate CSIServiceAccountToken with two additional fields in CSIDriverSpec. (kubernetes/kubernetes#93130, @zshihang) [SIG API Machinery, Apps, Auth, CLI, Network, Node, Storage and Testing]

  • Users can try the CronJob controller v2 using the feature gate. This will be the default controller in future releases. (kubernetes/kubernetes#93370, @alaypatel07) [SIG API Machinery, Apps, Auth and Testing]

  • VolumeSnapshotDataSource moves to GA in 1.20 release (kubernetes/kubernetes#95282, @xing-yang) [SIG Apps]

  • Certain fields on Service objects will be automatically cleared when changing the service's type to a mode that does not need those fields. For example, changing from type=LoadBalancer to type=ClusterIP will clear the NodePort assignments, rather than forcing the user to clear them. (kubernetes/kubernetes#95196, @thockin) [SIG API Machinery, Apps, Network and Testing]

  • Services will now have a clusterIPs field to go with clusterIP. clusterIPs[0] is a synonym for clusterIP and will be synchronized on create and update operations. (kubernetes/kubernetes#95894, @thockin) [SIG Network]

  • Add dual-stack Services (alpha). This is a BREAKING CHANGE to an alpha API. It changes the dual-stack API wrt Service from a single ipFamily field to 3 fields: ipFamilyPolicy (SingleStack, PreferDualStack, RequireDualStack), ipFamilies (a list of families assigned), and clusterIPs (inclusive of clusterIP). Most users do not need to set anything at all, defaulting will handle it for them. Services are single-stack unless the user asks for dual-stack. This is all gated by the "IPv6DualStack" feature gate. (kubernetes/kubernetes#91824, @khenidak) [SIG API Machinery, Apps, CLI, Network, Node, Scheduling and Testing]

  • Introduces a metric source for HPAs which allows scaling based on container resource usage. (kubernetes/kubernetes#90691, @arjunrn) [SIG API Machinery, Apps, Autoscaling and CLI]

  • New parameter defaultingType for PodTopologySpread plugin allows to use k8s defined or user-provided default constraints (kubernetes/kubernetes#95048, @alculquicondor) [SIG Scheduling]

  • GPU metrics provided by kubelet are now disabled by default (kubernetes/kubernetes#95184, @RenaudWasTaken) [SIG Node]

  • New parameter defaultingType for PodTopologySpread plugin allows to use k8s defined or user provided default constraints (kubernetes/kubernetes#95048, @alculquicondor) [SIG Scheduling]

  • Server Side Apply now treats LabelSelector fields as atomic (meaning the entire selector is managed by a single writer and updated together), since they contain interrelated and inseparable fields that do not merge in intuitive ways. (kubernetes/kubernetes#93901, @jpbetz) [SIG API Machinery, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Storage and Testing]

  • Status of v1beta1 CRDs without "preserveUnknownFields:false" will show violation "spec.preserveUnknownFields: Invalid value: true: must be false" (kubernetes/kubernetes#93078, @vareti) [SIG API Machinery]

  • A new nofuzz go build tag now disables gofuzz support. Release binaries enable this. (kubernetes/kubernetes#92491, @BenTheElder) [SIG API Machinery]

  • A new alpha-level field, SupportsFsGroup, has been introduced for CSIDrivers to allow them to specify whether they support volume ownership and permission modifications. The CSIVolumeSupportFSGroup feature gate must be enabled to allow this field to be used. (kubernetes/kubernetes#92001, @huffmanca) [SIG API Machinery, CLI and Storage]

  • Added pod version skew strategy for seccomp profile to synchronize the deprecated annotations with the new API Server fields. Please see the corresponding section in the KEP for more detailed explanations. (kubernetes/kubernetes#91408, @saschagrunert) [SIG Apps, Auth, CLI and Node]

  • Adds the ability to disable Accelerator/GPU metrics collected by Kubelet (kubernetes/kubernetes#91930, @RenaudWasTaken) [SIG Node]

  • Custom Endpoints are now mirrored to EndpointSlices by a new EndpointSliceMirroring controller. (kubernetes/kubernetes#91637, @robscott) [SIG API Machinery, Apps, Auth, Cloud Provider, Instrumentation, Network and Testing]

  • External facing API podresources is now available under k8s.io/kubelet/pkg/apis/ (kubernetes/kubernetes#92632, @RenaudWasTaken) [SIG Node and Testing]

  • Fix conversions for custom metrics. (kubernetes/kubernetes#94481, @wojtek-t) [SIG API Machinery and Instrumentation]

  • Generic ephemeral volumes, a new alpha feature under the GenericEphemeralVolume feature gate, provide a more flexible alternative to EmptyDir volumes: as with EmptyDir, volumes are created and deleted for each pod automatically by Kubernetes. But because the normal provisioning process is used (PersistentVolumeClaim), storage can be provided by third-party storage vendors and all of the usual volume features work. Volumes don't need to be empty; for example, restoring from snapshot is supported. (kubernetes/kubernetes#92784, @pohly) [SIG API Machinery, Apps, Auth, CLI, Instrumentation, Node, Scheduling, Storage and Testing]

  • Kube-controller-manager: volume plugins can be restricted from contacting local and loopback addresses by setting --volume-host-allow-local-loopback=false, or from contacting specific CIDR ranges by setting --volume-host-cidr-denylist (for example, --volume-host-cidr-denylist=127.0.0.1/28,feed::/16) (kubernetes/kubernetes#91785, @mattcary) [SIG API Machinery, Apps, Auth, CLI, Network, Node, Storage and Testing]

  • Kubernetes is now built with golang 1.15.0-rc.1.

    • The deprecated, legacy behavior of treating the CommonName field on X.509 serving certificates as a host name when no Subject Alternative Names are present is now disabled by default. It can be temporarily re-enabled by adding the value x509ignoreCN=0 to the GODEBUG environment variable. (kubernetes/kubernetes#93264, @justaugustus) [SIG API Machinery, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Release, Scalability, Storage and Testing]

  • Migrate scheduler, controller-manager and cloud-controller-manager to use LeaseLock (kubernetes/kubernetes#94603, @wojtek-t) [SIG API Machinery, Apps, Cloud Provider and Scheduling]

  • Modify DNS-1123 error messages to indicate that RFC 1123 is not followed exactly (kubernetes/kubernetes#94182, @mattfenwick) [SIG API Machinery, Apps, Auth, Network and Node]

  • The ServiceAccountIssuerDiscovery feature gate is now Beta and enabled by default. (kubernetes/kubernetes#91921, @mtaufen) [SIG Auth]

  • The kube-controller-manager managed signers can now have distinct signing certificates and keys. See the help about --cluster-signing-[signer-name]-{cert,key}-file. --cluster-signing-{cert,key}-file is still the default. (kubernetes/kubernetes#90822, @deads2k) [SIG API Machinery, Apps and Auth]

  • When creating a networking.k8s.io/v1 Ingress API object, spec.tls[*].secretName values are required to pass validation rules for Secret API object names. (kubernetes/kubernetes#93929, @liggitt) [SIG Network]

  • WinOverlay feature graduated to beta (kubernetes/kubernetes#94807, @ksubrmnn) [SIG Windows]

v19.15.0

Kubernetes API Version: v1.19.15

Feature

  • The new parameter 'no_proxy' has been added to configuration for the REST and websocket client. (kubernetes-client/python#1579, @itaru2622)//github.com/itaru2622))//github.com/itaru2622))//github.com/itaru2622))//github.com/itaru2622))//github.com/itaru2622))//github.com/itaru2622))//github.com/itaru2622))

v19.15.0b1

Kubernetes API Version: v1.19.15

  • No changes. The same as v19.15.0a1.

v19.15.0a1

Kubernetes API Version: v1.19.15

Bug Fix

Feature

API Change

  • We have added a new Priority & Fairness rule that exempts all probes (/readyz, /healthz, /livez) to prevent restarting of "healthy" kube-apiserver instance(s) by kubelet. (kubernetes/kubernetes#101113, @tkashem) [SIG API Machinery]
  • Fixes using server-side apply with APIService resources (kubernetes/kubernetes#100713, @kevindelgado) [SIG API Machinery, Apps, Scheduling and Testing]
  • Regenerate protobuf code to fix CVE-2021-3121 (kubernetes/kubernetes#100515, @joelsmith) [SIG API Machinery, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Node and Storage]
  • Kubernetes is now built using go1.15.8 (kubernetes/kubernetes#99093, @cpanato) [SIG Cloud Provider, Instrumentation, Release and Testing]
  • Fix conversions for custom metrics. (kubernetes/kubernetes#94654, @wojtek-t) [SIG Instrumentation]
  • A new alpha-level field, SupportsFsGroup, has been introduced for CSIDrivers to allow them to specify whether they support volume ownership and permission modifications. The CSIVolumeSupportFSGroup feature gate must be enabled to allow this field to be used. (kubernetes/kubernetes#92001, @huffmanca) [SIG API Machinery, CLI and Storage]
  • Added pod version skew strategy for seccomp profile to synchronize the deprecated annotations with the new API Server fields. Please see the corresponding section in the KEP for more detailed explanations. (kubernetes/kubernetes#91408, @saschagrunert) [SIG Apps, Auth, CLI and Node]
  • Adds the ability to disable Accelerator/GPU metrics collected by Kubelet (kubernetes/kubernetes#91930, @RenaudWasTaken) [SIG Node]
  • Admission webhooks can now return warning messages that are surfaced to API clients, using the .response.warnings field in the admission review response. (kubernetes/kubernetes#92667, @liggitt) [SIG API Machinery and Testing]
  • CertificateSigningRequest API conditions were updated:
    • a status field was added; this field defaults to True, and may only be set to True for Approved, Denied, and Failed conditions
    • a lastTransitionTime field was added
    • a Failed condition type was added to allow signers to indicate permanent failure; this condition can be added via the certificatesigningrequests/status subresource.
    • Approved and Denied conditions are mutually exclusive
    • Approved, Denied, and Failed conditions can no longer be removed from a CSR (kubernetes/kubernetes#90191, @liggitt) [SIG API Machinery, Apps, Auth, CLI and Node]
  • Cluster admins can now turn off /logs endpoint in kubelet by setting enableSystemLogHandler to false in their kubelet configuration file. enableSystemLogHandler can be set to true only when enableDebuggingHandlers is also set to true. (kubernetes/kubernetes#87273, @SaranBalaji90) [SIG Node]
  • Custom Endpoints are now mirrored to EndpointSlices by a new EndpointSliceMirroring controller. (kubernetes/kubernetes#91637, @robscott) [SIG API Machinery, Apps, Auth, Cloud Provider, Instrumentation, Network and Testing]
  • CustomResourceDefinitions added support for marking versions as deprecated by setting spec.versions[*].deprecated to true, and for optionally overriding the default deprecation warning with a spec.versions[*].deprecationWarning field. (kubernetes/kubernetes#92329, @liggitt) [SIG API Machinery]
  • EnvVarSource api doc bug fixes (kubernetes/kubernetes#91194, @wawa0210) [SIG Apps]
  • Fix bug in reflector that couldn't recover from "Too large resource version" errors (kubernetes/kubernetes#92537, @wojtek-t) [SIG API Machinery]
  • Fixed: log timestamps now include trailing zeros to maintain a fixed width (kubernetes/kubernetes#91207, @iamchuckss) [SIG Apps and Node]
  • Generic ephemeral volumes, a new alpha feature under the GenericEphemeralVolume feature gate, provide a more flexible alternative to EmptyDir volumes: as with EmptyDir, volumes are created and deleted for each pod automatically by Kubernetes. But because the normal provisioning process is used (PersistentVolumeClaim), storage can be provided by third-party storage vendors and all of the usual volume features work. Volumes don't need to be empt; for example, restoring from snapshot is supported. (kubernetes/kubernetes#92784, @pohly) [SIG API Machinery, Apps, Auth, CLI, Instrumentation, Node, Scheduling, Storage and Testing]
  • Go1.14.4 is now the minimum version required for building Kubernetes (kubernetes/kubernetes#92438, @liggitt) [SIG API Machinery, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Release, Storage and Testing]
  • Hide managedFields from kubectl edit command (kubernetes/kubernetes#91946, @soltysh) [SIG CLI]
  • K8s.io/apimachinery - scheme.Convert() now uses only explicitly registered conversions - default reflection based conversion is no longer available. +k8s:conversion-gen tags can be used with the k8s.io/code-generator component to generate conversions. (kubernetes/kubernetes#90018, @wojtek-t) [SIG API Machinery, Apps and Testing]
  • Kube-proxy: add --bind-address-hard-fail flag to treat failure to bind to a port as fatal (kubernetes/kubernetes#89350, @SataQiu) [SIG Cluster Lifecycle and Network]
  • Kubebuilder validation tags are set on metav1.Condition for CRD generation (kubernetes/kubernetes#92660, @damemi) [SIG API Machinery]
  • Kubelet's --runonce option is now also available in Kubelet's config file as runOnce. (kubernetes/kubernetes#89128, @vincent178) [SIG Node]
  • Kubelet: add '--logging-format' flag to support structured logging (kubernetes/kubernetes#91532, @afrouzMashaykhi) [SIG API Machinery, Cluster Lifecycle, Instrumentation and Node]
  • Kubernetes is now built with golang 1.15.0-rc.1.
    • The deprecated, legacy behavior of treating the CommonName field on X.509 serving certificates as a host name when no Subject Alternative Names are present is now disabled by default. It can be temporarily re-enabled by adding the value x509ignoreCN=0 to the GODEBUG environment variable. (kubernetes/kubernetes#93264, @justaugustus) [SIG API Machinery, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Release, Scalability, Storage and Testing]
  • Promote Immutable Secrets/ConfigMaps feature to Beta and enable the feature by default. This allows to set Immutable field in Secrets or ConfigMap object to mark their contents as immutable. (kubernetes/kubernetes#89594, @wojtek-t) [SIG Apps and Testing]
  • Remove BindTimeoutSeconds from schedule configuration KubeSchedulerConfiguration (kubernetes/kubernetes#91580, @cofyc) [SIG Scheduling and Testing]
  • Remove kubescheduler.config.k8s.io/v1alpha1 (kubernetes/kubernetes#89298, @gavinfish) [SIG Scheduling]
  • Reserve plugins that fail to reserve will trigger the unreserve extension point (kubernetes/kubernetes#92391, @adtac) [SIG Scheduling and Testing]
  • Resolve regression in metadata.managedFields handling in update/patch requests submitted by older API clients (kubernetes/kubernetes#91748, @apelisse)
  • Scheduler: optionally check for available storage capacity before scheduling pods which have unbound volumes (alpha feature with the new CSIStorageCapacity feature gate, only works for CSI drivers and depends on support for the feature in a CSI driver deployment) (kubernetes/kubernetes#92387, @pohly) [SIG API Machinery, Apps, Auth, Scheduling, Storage and Testing]
  • Seccomp support has graduated to GA. A new seccompProfile field is added to pod and container securityContext objects. Support for seccomp.security.alpha.kubernetes.io/pod and container.seccomp.security.alpha.kubernetes.io/... annotations is deprecated, and will be removed in v1.22. (kubernetes/kubernetes#91381, @pjbgf) [SIG Apps, Auth, Node, Release, Scheduling and Testing]
  • ServiceAppProtocol feature gate is now beta and enabled by default, adding new AppProtocol field to Services and Endpoints. (kubernetes/kubernetes#90023, @robscott) [SIG Apps and Network]
  • SetHostnameAsFQDN is a new field in PodSpec. When set to true, the fully qualified domain name (FQDN) of a Pod is set as hostname of its containers. In Linux containers, this means setting the FQDN in the hostname field of the kernel (the nodename field of struct utsname). In Windows containers, this means setting the this means setting the registry value of hostname for the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters to FQDN. If a pod does not have FQDN, this has no effect. (kubernetes/kubernetes#91699, @javidiaz) [SIG Apps, Network, Node and Testing]
  • The CertificateSigningRequest API is promoted to certificates.k8s.io/v1 with the following changes:
    • spec.signerName is now required, and requests for kubernetes.io/legacy-unknown are not allowed to be created via the certificates.k8s.io/v1 API
    • spec.usages is now required, may not contain duplicate values, and must only contain known usages
    • status.conditions may not contain duplicate types
    • status.conditions[*].status is now required
    • status.certificate must be PEM-encoded, and contain only CERTIFICATE blocks (kubernetes/kubernetes#91685, @liggitt) [SIG API Machinery, Architecture, Auth, CLI and Testing]
  • The HugePageStorageMediumSize feature gate is now on by default allowing usage of multiple sizes huge page resources on a container level. (kubernetes/kubernetes#90592, @bart0sh) [SIG Node]
  • The Kubelet's --node-status-max-images option is now available via the Kubelet config file field nodeStatusMaxImage (kubernetes/kubernetes#91275, @knabben) [SIG Node]
  • The Kubelet's --seccomp-profile-root option is now marked as deprecated. (kubernetes/kubernetes#91182, @knabben) [SIG Node]
  • The Kubelet's --bootstrap-checkpoint-path option is now removed. (kubernetes/kubernetes#91577, @knabben) [SIG Apps and Node]
  • The Kubelet's --cloud-provider and --cloud-config options are now marked as deprecated. (kubernetes/kubernetes#90408, @knabben) [SIG Cloud Provider and Node]
  • The Kubelet's --enable-server and --provider-id option is now available via the Kubelet config file field enableServer and providerID respectively. (kubernetes/kubernetes#90494, @knabben) [SIG Node]
  • The Kubelet's --kernel-memcg-notification option is now available via the Kubelet config file field kernelMemcgNotification (kubernetes/kubernetes#91863, @knabben) [SIG Cloud Provider, Node and Testing]
  • The Kubelet's --really-crash-for-testing and --chaos-chance options are now marked as deprecated. (kubernetes/kubernetes#90499, @knabben) [SIG Node]
  • The Kubelet's --volume-plugin-dir option is now available via the Kubelet config file field VolumePluginDir. (kubernetes/kubernetes#88480, @savitharaghunathan) [SIG Node]
  • The DefaultIngressClass feature is now GA. The --feature-gate parameter will be removed in 1.20. (kubernetes/kubernetes#91957, @cmluciano) [SIG API Machinery, Apps, Network and Testing]
  • The alpha DynamicAuditing feature gate and auditregistration.k8s.io/v1alpha1 API have been removed and are no longer supported. (kubernetes/kubernetes#91502, @deads2k) [SIG API Machinery, Auth and Testing]
  • The kube-controller-manager managed signers can now have distinct signing certificates and keys. See the help about --cluster-signing-[signer-name]-{cert,key}-file. --cluster-signing-{cert,key}-file is still the default. (kubernetes/kubernetes#90822, @deads2k) [SIG API Machinery, Apps and Auth]
  • The unused series.state field, deprecated since v1.14, is removed from the events.k8s.io/v1beta1 and v1 Event types. (kubernetes/kubernetes#90449, @wojtek-t) [SIG Apps]
  • Unreserve extension point for scheduler plugins is merged into Reserve extension point (kubernetes/kubernetes#92200, @adtac) [SIG Scheduling and Testing]
  • Update Golang to v1.14.4 (kubernetes/kubernetes#88638, @justaugustus) [SIG API Machinery, Cloud Provider, Release and Testing]
  • Updated the API documentation for Service.Spec.IPFamily to warn that its exact semantics will probably change before the dual-stack feature goes GA, and users should look at ClusterIP or Endpoints, not IPFamily, to figure out if an existing Service is IPv4, IPv6, or dual-stack. (kubernetes/kubernetes#91527, @danwinship) [SIG Apps and Network]
  • Users can configure a resource prefix to ignore a group of resources. (kubernetes/kubernetes#88842, @angao) [SIG Node and Scheduling]
  • Ingress and IngressClass resources have graduated to networking.k8s.io/v1. Ingress and IngressClass types in the extensions/v1beta1 and networking.k8s.io/v1beta1 API versions are deprecated and will no longer be served in 1.22+. Persisted objects can be accessed via the networking.k8s.io/v1 API. Notable changes in v1 Ingress objects (v1beta1 field names are unchanged):
    • spec.backend -> spec.defaultBackend
    • serviceName -> service.name
    • servicePort -> service.port.name (for string values)
    • servicePort -> service.port.number (for numeric values)
    • pathType no longer has a default value in v1; "Exact", "Prefix", or "ImplementationSpecific" must be specified Other Ingress API updates:
    • backends can now be resource or service backends
    • path is no longer required to be a valid regular expression (kubernetes/kubernetes#89778, @cmluciano) [SIG API Machinery, Apps, CLI, Network and Testing]
  • NodeResourcesLeastAllocated and NodeResourcesMostAllocated plugins now support customized weight on the CPU and memory. (kubernetes/kubernetes#90544, @chendave) [SIG Scheduling]
  • PostFilter type is added to scheduler component config API on version v1beta1. (kubernetes/kubernetes#91547, @Huang-Wei) [SIG Scheduling]
  • RequestedToCapacityRatioArgs encoding is now strict (kubernetes/kubernetes#91603, @pancernik) [SIG Scheduling]
  • v1beta1 Scheduler Extender encoding is case-sensitive (v1alpha1/v1alpha2 was case-insensitive), its httpTimeout field uses duration encoding (for example, one second is specified as "1s"), and the enableHttps field in v1alpha1/v1alpha2 was renamed to enableHTTPS. (kubernetes/kubernetes#91625, @pancernik) [SIG Scheduling]
  • Adds the ability to disable Accelerator/GPU metrics collected by Kubelet (kubernetes/kubernetes#91930, @RenaudWasTaken) [SIG Node]
  • Kubernetes is now built with golang 1.15.0-rc.1.
    • The deprecated, legacy behavior of treating the CommonName field on X.509 serving certificates as a host name when no Subject Alternative Names are present is now disabled by default. It can be temporarily re-enabled by adding the value x509ignoreCN=0 to the GODEBUG environment variable. (kubernetes/kubernetes#93264, @justaugustus) [SIG API Machinery, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Release, Scalability, Storage and Testing]
  • A new alpha-level field, SupportsFsGroup, has been introduced for CSIDrivers to allow them to specify whether they support volume ownership and permission modifications. The CSIVolumeSupportFSGroup feature gate must be enabled to allow this field to be used. (kubernetes/kubernetes#92001, @huffmanca) [SIG API Machinery, CLI and Storage]
  • The kube-controller-manager managed signers can now have distinct signing certificates and keys. See the help about --cluster-signing-[signer-name]-{cert,key}-file. --cluster-signing-{cert,key}-file is still the default. (kubernetes/kubernetes#90822, @deads2k) [SIG API Machinery, Apps and Auth]
  • Added pod version skew strategy for seccomp profile to synchronize the deprecated annotations with the new API Server fields. Please see the corresponding section in the KEP for more detailed explanations. (kubernetes/kubernetes#91408, @saschagrunert) [SIG Apps, Auth, CLI and Node]
  • Custom Endpoints are now mirrored to EndpointSlices by a new EndpointSliceMirroring controller. (kubernetes/kubernetes#91637, @robscott) [SIG API Machinery, Apps, Auth, Cloud Provider, Instrumentation, Network and Testing]
  • Generic ephemeral volumes, a new alpha feature under the GenericEphemeralVolume feature gate, provide a more flexible alternative to EmptyDir volumes: as with EmptyDir, volumes are created and deleted for each pod automatically by Kubernetes. But because the normal provisioning process is used (PersistentVolumeClaim), storage can be provided by third-party storage vendors and all of the usual volume features work. Volumes don't need to be empt; for example, restoring from snapshot is supported. (kubernetes/kubernetes#92784, @pohly) [SIG API Machinery, Apps, Auth, CLI, Instrumentation, Node, Scheduling, Storage and Testing]
  • Remove BindTimeoutSeconds from schedule configuration KubeSchedulerConfiguration (kubernetes/kubernetes#91580, @cofyc) [SIG Scheduling and Testing]
  • Resolve regression in metadata.managedFields handling in update/patch requests submitted by older API clients (kubernetes/kubernetes#91748, @apelisse) [SIG API Machinery and Testing]
  • The CertificateSigningRequest API is promoted to certificates.k8s.io/v1 with the following changes:
    • spec.signerName is now required, and requests for kubernetes.io/legacy-unknown are not allowed to be created via the certificates.k8s.io/v1 API
    • spec.usages is now required, may not contain duplicate values, and must only contain known usages
    • status.conditions may not contain duplicate types
    • status.conditions[*].status is now required
    • status.certificate must be PEM-encoded, and contain only CERTIFICATE blocks (kubernetes/kubernetes#91685, @liggitt) [SIG API Machinery, Architecture, Auth, CLI and Testing]
  • The Kubelet's --cloud-provider and --cloud-config options are now marked as deprecated. (kubernetes/kubernetes#90408, @knabben) [SIG Cloud Provider and Node]
  • CertificateSigningRequest API conditions were updated:
    • a status field was added; this field defaults to True, and may only be set to True for Approved, Denied, and Failed conditions
    • a lastTransitionTime field was added
    • a Failed condition type was added to allow signers to indicate permanent failure; this condition can be added via the certificatesigningrequests/status subresource.
    • Approved and Denied conditions are mutually exclusive
    • Approved, Denied, and Failed conditions can no longer be removed from a CSR (kubernetes/kubernetes#90191, @liggitt) [SIG API Machinery, Apps, Auth, CLI and Node]
  • EnvVarSource api doc bug fixes (kubernetes/kubernetes#91194, @wawa0210) [SIG Apps]
  • Fixed: log timestamps now include trailing zeros to maintain a fixed width (kubernetes/kubernetes#91207, @iamchuckss) [SIG Apps and Node]
  • The Kubelet's --node-status-max-images option is now available via the Kubelet config file field nodeStatusMaxImage (kubernetes/kubernetes#91275, @knabben) [SIG Node]
  • The Kubelet's --seccomp-profile-root option is now available via the Kubelet config file field seccompProfileRoot. (kubernetes/kubernetes#91182, @knabben) [SIG Node]
  • The Kubelet's --enable-server and --provider-id option is now available via the Kubelet config file field enableServer and providerID respectively. (kubernetes/kubernetes#90494, @knabben) [SIG Node]
  • The Kubelet's --really-crash-for-testing and --chaos-chance options are now marked as deprecated. (kubernetes/kubernetes#90499, @knabben) [SIG Node]
  • The alpha DynamicAuditing feature gate and auditregistration.k8s.io/v1alpha1 API have been removed and are no longer supported. (kubernetes/kubernetes#91502, @deads2k) [SIG API Machinery, Auth and Testing]
  • NodeResourcesLeastAllocated and NodeResourcesMostAllocated plugins now support customized weight on the CPU and memory. (kubernetes/kubernetes#90544, @chendave) [SIG Scheduling]
  • PostFilter type is added to scheduler component config API on version v1beta1. (kubernetes/kubernetes#91547, @Huang-Wei) [SIG Scheduling]
  • kubescheduler.config.k8s.io is now beta (kubernetes/kubernetes#91420, @pancernik) [SIG Scheduling]
  • EnvVarSource api doc bug fixes (kubernetes/kubernetes#91194, @wawa0210) [SIG Apps]
  • The Kubelet's --really-crash-for-testing and --chaos-chance options are now marked as deprecated. (kubernetes/kubernetes#90499, @knabben) [SIG Node]
  • NodeResourcesLeastAllocated and NodeResourcesMostAllocated plugins now support customized weight on the CPU and memory. (kubernetes/kubernetes#90544, @chendave) [SIG Scheduling]
  • K8s.io/apimachinery - scheme.Convert() now uses only explicitly registered conversions - default reflection based conversion is no longer available. +k8s:conversion-gen tags can be used with the k8s.io/code-generator component to generate conversions. (kubernetes/kubernetes#90018, @wojtek-t) [SIG API Machinery, Apps and Testing]
  • Kubelet's --runonce option is now also available in Kubelet's config file as runOnce. (kubernetes/kubernetes#89128, @vincent178) [SIG Node]
  • Promote Immutable Secrets/ConfigMaps feature to Beta and enable the feature by default. This allows to set Immutable field in Secrets or ConfigMap object to mark their contents as immutable. (kubernetes/kubernetes#89594, @wojtek-t) [SIG Apps and Testing]
  • The unused series.state field, deprecated since v1.14, is removed from the events.k8s.io/v1beta1 and v1 Event types. (kubernetes/kubernetes#90449, @wojtek-t) [SIG Apps]
  • Kube-proxy: add --bind-address-hard-fail flag to treat failure to bind to a port as fatal (kubernetes/kubernetes#89350, @SataQiu) [SIG Cluster Lifecycle and Network]
  • Remove kubescheduler.config.k8s.io/v1alpha1 (kubernetes/kubernetes#89298, @gavinfish) [SIG Scheduling]
  • ServiceAppProtocol feature gate is now beta and enabled by default, adding new AppProtocol field to Services and Endpoints. (kubernetes/kubernetes#90023, @robscott) [SIG Apps and Network]
  • The Kubelet's --volume-plugin-dir option is now available via the Kubelet config file field VolumePluginDir. (kubernetes/kubernetes#88480, @savitharaghunathan) [SIG Node]
  • A new IngressClass resource has been added to enable better Ingress configuration. (kubernetes/kubernetes#88509, @robscott) [SIG API Machinery, Apps, CLI, Network, Node and Testing]
  • API additions to apiserver types (kubernetes/kubernetes#87179, @Jefftree) [SIG API Machinery, Cloud Provider and Cluster Lifecycle]
  • Add Scheduling Profiles to kubescheduler.config.k8s.io/v1alpha2 (kubernetes/kubernetes#88087, @alculquicondor) [SIG Scheduling and Testing]
  • Added GenericPVCDataSource feature gate to enable using arbitrary custom resources as the data source for a PVC. (kubernetes/kubernetes#88636, @bswartz) [SIG Apps and Storage]
  • Added support for multiple sizes huge pages on a container level (kubernetes/kubernetes#84051, @bart0sh) [SIG Apps, Node and Storage]
  • Allow user to specify fsgroup permission change policy for pods (kubernetes/kubernetes#88488, @gnufied) [SIG Apps and Storage]
  • AppProtocol is a new field on Service and Endpoints resources, enabled with the ServiceAppProtocol feature gate. (kubernetes/kubernetes#88503, @robscott) [SIG Apps and Network]
  • BlockVolume and CSIBlockVolume features are now GA. (kubernetes/kubernetes#88673, @jsafrane) [SIG Apps, Node and Storage]
  • Consumers of the 'certificatesigningrequests/approval' API must now grant permission to 'approve' CSRs for the 'signerName' specified on the CSR. More information on the new signerName field can be found at https://github.com/kubernetes/enhancements/blob/master/keps/sig-auth/1513-certificate-signing-request/README.md/#signers (kubernetes/kubernetes#88246, @munnerz) [SIG API Machinery, Apps, Auth, CLI, Node and Testing]
  • CustomResourceDefinition schemas that use x-kubernetes-list-map-keys to specify properties that uniquely identify list items must make those properties required or have a default value, to ensure those properties are present for all list items. See https://kubernetes.io/docs/reference/using-api/api-concepts/#merge-strategy for details. (kubernetes/kubernetes#88076, @eloyekunle) [SIG API Machinery and Testing]
  • Fixed missing validation of uniqueness of list items in lists with x-kubernetes-list-type: map or x-kubernetes-list-type: set in CustomResources. (kubernetes/kubernetes#84920, @sttts) [SIG API Machinery]
  • Fixes a regression with clients prior to 1.15 not being able to update podIP in pod status, or podCIDR in node spec, against >= 1.16 API servers (kubernetes/kubernetes#88505, @liggitt) [SIG Apps and Network]
  • Ingress: Add Exact and Prefix matching to Ingress PathTypes (kubernetes/kubernetes#88587, @cmluciano) [SIG Apps, Cluster Lifecycle and Network]
  • Ingress: Add alternate backends via TypedLocalObjectReference (kubernetes/kubernetes#88775, @cmluciano) [SIG Apps and Network]
  • Ingress: allow wildcard hosts in IngressRule (kubernetes/kubernetes#88858, @cmluciano) [SIG Network]
  • Introduces optional --detect-local flag to kube-proxy. Currently the only supported value is "cluster-cidr", which is the default if not specified. (kubernetes/kubernetes#87748, @satyasm) [SIG Cluster Lifecycle, Network and Scheduling]
  • Kube-controller-manager and kube-scheduler expose profiling by default to match the kube-apiserver. Use --profiling=false to disable. (kubernetes/kubernetes#88663, @deads2k) [SIG API Machinery, Cloud Provider and Scheduling]
  • Kube-scheduler can run more than one scheduling profile. Given a pod, the profile is selected by using its .spec.SchedulerName. (kubernetes/kubernetes#88285, @alculquicondor) [SIG Apps, Scheduling and Testing]
  • Move TaintBasedEvictions feature gates to GA (kubernetes/kubernetes#87487, @skilxn-go) [SIG API Machinery, Apps, Node, Scheduling and Testing]
  • Moving Windows RunAsUserName feature to GA (kubernetes/kubernetes#87790, @marosset) [SIG Apps and Windows]
  • New flag --endpointslice-updates-batch-period in kube-controller-manager can be used to reduce number of endpointslice updates generated by pod changes. (kubernetes/kubernetes#88745, @mborsz) [SIG API Machinery, Apps and Network]
  • New flag --show-hidden-metrics-for-version in kubelet can be used to show all hidden metrics that deprecated in the previous minor release. (kubernetes/kubernetes#85282, @serathius) [SIG Node]
  • Removes ConfigMap as suggestion for IngressClass parameters (kubernetes/kubernetes#89093, @robscott) [SIG Network]
  • Scheduler Extenders can now be configured in the v1alpha2 component config (kubernetes/kubernetes#88768, @damemi) [SIG Release, Scheduling and Testing]
  • The apiserver/v1alph1 #EgressSelectorConfiguration API is now beta. (kubernetes/kubernetes#88502, @caesarxuchao) [SIG API Machinery]
  • The storage.k8s.io/CSIDriver has moved to GA, and is now available for use. (kubernetes/kubernetes#84814, @huffmanca) [SIG API Machinery, Apps, Auth, Node, Scheduling, Storage and Testing]
  • VolumePVCDataSource moves to GA in 1.18 release (kubernetes/kubernetes#88686, @j-griffith) [SIG Apps, CLI and Cluster Lifecycle]

v18.20.0

Kubernetes API Version: 1.18.20

Feature

v18.20.0b1

Kubernetes API Version: 1.18.20

Important Information:

  • Python 2 had reached End of Life on January 1, 2020. The Kubernetes Python Client has dropped support for Python 2 from this release (v18.20.0b1) and will no longer provide support to older clients as per the Kubernetes support policy.

v18.17.0a1

Kubernetes API Version: 1.18.17

Important Information:

  • The Kubernetes Python client versioning scheme has changed. The version numbers used till Kubernetes Python Client v12.y.z lagged behind the actual Kubernetes minor version numbers. From this release, the client is moving a version format vY.Z.P where Y and Z are respectively from the Kubernetes version v1.Y.Z and P would incremented due to changes on the Python client side itself. Ref: kubernetes-client#1244
  • Python 2 had reached End of Life on January 1, 2020. The Kubernetes Python Client has dropped support for Python 2 from this release (v18.0.0) and will no longer provide support to older clients as per the Kubernetes support policy.

Deprecations:

  • The following deprecated APIs can no longer be served:
    • All resources under apps/v1beta1 and apps/v1beta2 - use apps/v1 instead
    • daemonsets, deployments, replicasets resources under extensions/v1beta1 - use apps/v1 instead
    • networkpolicies resources under extensions/v1beta1 - use networking.k8s.io/v1 instead
    • podsecuritypolicies resources under extensions/v1beta1 - use policy/v1beta1 instead (#85903, @liggitt) [SIG API Machinery, Apps, Cluster Lifecycle, Instrumentation and Testing]

New Feature:

Bug Fix:

API Change:

  • Add allowWatchBookmarks, resoureVersionMatch parameters to custom objects. kubernetes-client/gen#180
  • Fix bug in reflector that couldn't recover from "Too large resource version" errors (#92537, @wojtek-t) [SIG API Machinery]
  • Fixed: log timestamps now include trailing zeros to maintain a fixed width (#91207, @iamchuckss) [SIG Apps and Node]
  • Fixed: log timestamps now include trailing zeros to maintain a fixed width (#91207, @iamchuckss) [SIG Apps and Node]
  • Resolve regression in metadata.managedFields handling in update/patch requests submitted by older API clients (#92007, @apelisse) [SIG API Machinery and Testing]
  • A new IngressClass resource has been added to enable better Ingress configuration. (#88509, @robscott) [SIG API Machinery, Apps, CLI, Network, Node and Testing]
  • The CSIDriver API has graduated to storage.k8s.io/v1, and is now available for use. (#84814, @huffmanca) [SIG Storage]
  • autoscaling/v2beta2 HorizontalPodAutoscaler added a spec.behavior field that allows scale behavior to be configured. Behaviors are specified separately for scaling up and down. In each direction a stabilization window can be specified as well as a list of policies and how to select amongst them. Policies can limit the absolute number of pods added or removed, or the percentage of pods added or removed. (#74525, @gliush) [SIG API Machinery, Apps, Autoscaling and CLI]
  • Ingress:
    • spec.ingressClassName replaces the deprecated kubernetes.io/ingress.class annotation, and allows associating an Ingress object with a particular controller.
    • path definitions added a pathType field to allow indicating how the specified path should be matched against incoming requests. Valid values are Exact, Prefix, and ImplementationSpecific (#88587, @cmluciano) [SIG Apps, Cluster Lifecycle and Network]
  • The alpha feature AnyVolumeDataSource enables PersistentVolumeClaim objects to use the spec.dataSource field to reference a custom type as a data source (#88636, @bswartz) [SIG Apps and Storage]
  • The alpha feature ConfigurableFSGroupPolicy enables v1 Pods to specify a spec.securityContext.fsGroupChangePolicy policy to control how file permissions are applied to volumes mounted into the pod. (#88488, @gnufied) [SIG Storage]
  • The alpha feature ServiceAppProtocol enables setting an appProtocol field in ServicePort and EndpointPort definitions. (#88503, @robscott) [SIG Apps and Network]
  • The alpha feature ImmutableEphemeralVolumes enables an immutable field in both Secret and ConfigMap objects to mark their contents as immutable. (#86377, @wojtek-t) [SIG Apps, CLI and Testing]
  • The beta feature ServerSideApply enables tracking and managing changed fields for all new objects, which means there will be managedFields in metadata with the list of managers and their owned fields.
  • The alpha feature ServiceAccountIssuerDiscovery enables publishing OIDC discovery information and service account token verification keys at /.well-known/openid-configuration and /openid/v1/jwks endpoints by API servers configured to issue service account tokens. (#80724, @cceckman) [SIG API Machinery, Auth, Cluster Lifecycle and Testing]
  • CustomResourceDefinition schemas that use x-kubernetes-list-map-keys to specify properties that uniquely identify list items must make those properties required or have a default value, to ensure those properties are present for all list items. See https://kubernetes.io/docs/reference/using-api/api-concepts/&#35;merge-strategy for details. (#88076, @eloyekunle) [SIG API Machinery and Testing]
  • CustomResourceDefinition schemas that use x-kubernetes-list-type: map or x-kubernetes-list-type: set now enable validation that the list items in the corresponding custom resources are unique. (#84920, @sttts) [SIG API Machinery]

To read the full CHANGELOG visit here.

v17.17.0

Kubernetes API Version: 1.17.17

Changelog since v17.17.0b1:

Bug or Regression

Feature

v17.17.0b1

Kubernetes API Version: 1.17.17

Changelog since v17.14.0a1:

New Feature:

API Change:

Bug Fix:

v17.14.0a1

Kubernetes API Version: 1.17.14

Important Information:

  • The Kubernetes Python client versioning scheme has changed. The version numbers used till Kubernetes Python Client v12.y.z lagged behind the actual Kubernetes minor version numbers. From this release, the client is moving a version format vY.Z.P where Y and Z are respectively from the Kubernetes version v1.Y.Z and P would incremented due to changes on the Python client side itself. Ref: kubernetes-client#1244
  • Python 2 had reached End of Life on January 1, 2020. The Kubernetes Python Client will drop support for Python 2 from the next release (v18.0.0) and will no longer provide support to older clients as per the Kubernetes support policy.

API Change:

  • Fixed: log timestamps now include trailing zeros to maintain a fixed width (#91207, @iamchuckss) [SIG Apps and Node]
  • Resolve regression in metadata.managedFields handling in update/patch requests submitted by older API clients (#92008, @apelisse) [SIG API Machinery and Testing]
  • Fix bug where sending a status update completely wipes managedFields for some types. (#90032, @apelisse) [SIG API Machinery and Testing]
  • Fixes a regression with clients prior to 1.15 not being able to update podIP in pod status, or podCIDR in node spec, against >= 1.16 API servers (#88505, @liggitt) [SIG Apps and Network]
  • CustomResourceDefinitions now validate documented API semantics of x-kubernetes-list-type and x-kubernetes-map-type atomic to reject non-atomic sub-types. (#84722, @sttts)
  • Kube-apiserver: The AdmissionConfiguration type accepted by --admission-control-config-file has been promoted to apiserver.config.k8s.io/v1 with no schema changes. (#85098, @liggitt)
  • Fixed EndpointSlice port name validation to match Endpoint port name validation (allowing port names longer than 15 characters) (#84481, @robscott)
  • CustomResourceDefinitions introduce x-kubernetes-map-type annotation as a CRD API extension. Enables this particular validation for server-side apply. (#84113, @enxebre)

To read the full CHANGELOG visit here.

v12.0.1

Kubernetes API Version: 1.16.15

Breaking Change:

  • kubernetes.config.Configuration() will now return the default "initial" configuration, kubernetes.config.Configuration.get_default_copy() will return the default configuration if there is a default set via Configuration.set_default(c), otherwise, it will also return the default "initial" configuration. OpenAPITools/openapi-generator#4485, OpenAPITools/openapi-generator#5315. **Note: ** This change also affects v12.0.0a1, v12.0.0b1 and v12.0.0.

Bug Fix:

v12.0.0

Kubernetes API Version: 1.16.15

New Feature:

v12.0.0b1

Kubernetes API Version: 1.16.14

New Feature:

Bug Fix:

v12.0.0a1

Kubernetes API Version: 1.16.14

API Change:

  • Resolve regression in metadata.managedFields handling in update/patch requests submitted by older API clients (#91748, @apelisse) [SIG API Machinery and Testing]
  • Fix bug where sending a status update completely wipes managedFields for some types. (#90033, @apelisse) [SIG API Machinery and Testing]
  • The MutatingWebhookConfiguration and ValidatingWebhookConfiguration APIs have been promoted to admissionregistration.k8s.io/v1:
    • failurePolicy default changed from Ignore to Fail for v1
    • matchPolicy default changed from Exact to Equivalent for v1
    • timeout default changed from 30s to 10s for v1
    • sideEffects default value is removed, and the field made required, and only None and NoneOnDryRun are permitted for v1
    • admissionReviewVersions default value is removed and the field made required for v1 (supported versions for AdmissionReview are v1 and v1beta1)
    • The name field for specified webhooks must be unique for MutatingWebhookConfiguration and ValidatingWebhookConfiguration objects created via admissionregistration.k8s.io/v1
  • The AdmissionReview API sent to and received from admission webhooks has been promoted to admission.k8s.io/v1. Webhooks can specify a preference for receiving v1 AdmissionReview objects with admissionReviewVersions: ["v1","v1beta1"], and must respond with an API object in the same apiVersion they are sent. When webhooks use admission.k8s.io/v1, the following additional validation is performed on their responses:
    • response.patch and response.patchType are not permitted from validating admission webhooks
    • apiVersion: "admission.k8s.io/v1" is required
    • kind: "AdmissionReview" is required
    • response.uid: "<value of request.uid>" is required
    • response.patchType: "JSONPatch" is required (if response.patch is set) (#80231, @liggitt)
  • The CustomResourceDefinition API type is promoted to apiextensions.k8s.io/v1 with the following changes:
    • Use of the new default feature in validation schemas is limited to v1
    • spec.scope is no longer defaulted to Namespaced and must be explicitly specified
    • spec.version is removed in v1; use spec.versions instead
    • spec.validation is removed in v1; use spec.versions[*].schema instead
    • spec.subresources is removed in v1; use spec.versions[*].subresources instead
    • spec.additionalPrinterColumns is removed in v1; use spec.versions[*].additionalPrinterColumns instead
    • spec.conversion.webhookClientConfig is moved to spec.conversion.webhook.clientConfig in v1
    • spec.conversion.conversionReviewVersions is moved to spec.conversion.webhook.conversionReviewVersions in v1
    • spec.versions[*].schema.openAPIV3Schema is now required when creating v1 CustomResourceDefinitions
    • spec.preserveUnknownFields: true is disallowed when creating v1 CustomResourceDefinitions; it must be specified within schema definitions as x-kubernetes-preserve-unknown-fields: true
    • In additionalPrinterColumns items, the JSONPath field was renamed to jsonPath in v1 (fixes kubernetes/kubernetes#66531) The apiextensions.k8s.io/v1beta1 version of CustomResourceDefinition is deprecated and will no longer be served in v1.19. (#79604, @liggitt)
  • The ConversionReview API sent to and received from custom resource CustomResourceDefinition conversion webhooks has been promoted to apiextensions.k8s.io/v1. CustomResourceDefinition conversion webhooks can now indicate they support receiving and responding with ConversionReview API objects in the apiextensions.k8s.io/v1 version by including v1 in the conversionReviewVersions list in their CustomResourceDefinition. Conversion webhooks must respond with a ConversionReview object in the same apiVersion they receive. apiextensions.k8s.io/v1 ConversionReview responses must specify a response.uid that matches the request.uid of the object they were sent. (#81476, @liggitt)
  • Add scheduling support for RuntimeClasses. RuntimeClasses can now specify nodeSelector constraints & tolerations, which are merged into the PodSpec for pods using that RuntimeClass. (#80825, @tallclair)
  • Kubelet should now more reliably report the same primary node IP even if the set of node IPs reported by the CloudProvider changes. (#79391, @danwinship)
  • Omit nil or empty field when calculating container hash value to avoid hash changed. For a new field with a non-nil default value in the container spec, the hash would still get changed. (#57741, @dixudx)
  • Property conditions in apiextensions.v1beta1.CustomResourceDefinitionStatus and apiextensions.v1.CustomResourceDefinitionStatus is now optional instead of required. (#64996, @roycaihw)
  • When the status of a CustomResourceDefinition condition changes, its corresponding lastTransitionTime is now updated. (#69655, @CaoShuFeng)

New Feature:

Bug Fix:

OpenAPI Generator Changes:

OpenAPI Generator has been updated to v4.3.0 from v3.3.4. Following are links to Python client related changes throughout the OpenAPI releases above v3.3.4 to v4.3.0:

v11.0.0

Kubernetes API Version: 1.15.10

API Change:

New Feature:

Bug Fix:

Deprecation Notice v11.0.0 of the client follows the Kubernetes deprecation policy and will be deprecated as and when Kubernetes version v1.15 gets deprecated.

v11.0.0b2

Bug Fix:

v11.0.0b1

Bug Fix:

New Feature:

v11.0.0a1

New Feature:

Breaking Change:

  • The Python client will be generated by openapi-generator, with the following breaking changes kubernetes-client/gen#97
  • kubernetes.client.apis package is renamed to kubernetes.client.api
  • kubernetes package code now uses absolute import instead of relative import
  • The swagger_types attribute in all models is renamed to openapi_types
  • Python3.4 is no longer supported kubernetes-client/python#807

API Change:

  • Introduce ExtensionsV1beta1RuntimeClassStrategyOptions and PolicyV1beta1RuntimeClassStrategyOptions. Add RuntimeClass restrictions & defaulting to PodSecurityPolicy kubernetes/kubernetes#73795
  • Introduce V1WindowsSecurityContextOptions. Add Windows specific options in Pod Security Context and Container Security Context kubernetes/kubernetes#77147
  • Split V1beta1Webhook into V1beta1MutatingWebhook and V1beta1ValidatingWebhook kubernetes/kubernetes#78491
  • Introduce parameter allow_watch_bookmarks in list options for requesting watch bookmarks from apiserver. The implementation in apiserver is hidden behind feature gate WatchBookmark (currently in Alpha stage) kubernetes/kubernetes#74074
  • Add V1DeleteOptions parameters (dry_run, grace_period_seconds, orphan_dependents, propagation_policy) to delete collection APIs kubernetes/kubernetes#77843
  • Add ListMeta.RemainingItemCount. When responding a LIST request, if the server has more data available, and if the request does not contain label selectors or field selectors, the server sets the ListOptions.RemainingItemCount to the number of remaining objects kubernetes/kubernetes#75993
  • Add controller_expand_secret_ref in V1SecretReference to store CSI volume expansion secrets kubernetes/kubernetes#77516
  • Introduce preemption_policy field to V1PriorityClass kubernetes/kubernetes#74614
  • Add port configuration to service reference in Admission webhook configuration, AuditSink webhook configuration, CRD Conversion webhook configuration and kube-aggregator kubernetes/kubernetes#74855
  • Introduce inline_volume_spec to V1PersistentVolumeSpec kubernetes/kubernetes#77703
  • Add fields x_kubernetes_embedded_resource, x_kubernetes_int_or_string, x_kubernetes_preserve_unknown_fields to V1beta1JSONSchemaProps kubernetes/kubernetes#77207

Bug Fix:

v10.1.0

Bug Fix:

  • Fixed issue in __del__ method of the ApiClient that caused an indefinite hang during garbage collection. Note The ApiClient ThreadPool will no longer be cleaned up automatically during garbage collection, instead the close method must be invoked directly, or the ApiClient can be used as a context manager. kubernetes-client/python#1073

v10.0.1

Bug Fix:

Security Fix:

v10.0.0

Bug Fix:

New Feature:

v10.0.0a1

Bug Fix:

New Feature:

API Change:

  • Remove the AdmissionregistrationV1alpha1 API group, containing only the InitializationConfiguration type kubernetes/kubernetes#72972
  • Promote Lease API to v1 kubernetes/kubernetes#72239
  • The Ingress API is now available via NetworkingV1beta1Api. ExtensionsV1beta1Api Ingress objects are deprecated and will no longer be served in Kubernetes v1.18 kubernetes/kubernetes#74057
  • Introduce RuntimeClass to NodeV1alpha1Api and NodeV1beta1Api kubernetes/kubernetes#74433
  • Graduate PriorityClass API to GA SchedulingV1Api kubernetes/kubernetes#73555
  • Introduce CSINodeInfo and CSIDriver to StorageV1beta1Api kubernetes/kubernetes#74283
  • The alpha Initializers feature, admissionregistration.k8s.io/v1alpha1 API version, Initializers admission plugin, and use of the metadata.initializers API field have been removed. Discontinue use of the alpha feature and delete any existing InitializerConfiguration API objects before upgrading. The metadata.initializers field will be removed in a future release. The parameter include_uninitialized has been removed. kubernetes/kubernetes#72972

v9.0.0

Bug Fix:

v9.0.0b1

Breaking Change:

Bug Fix:

API Change:

New Feature:

v9.0.0a1

Bug Fix:

Security Fix:

API Change:

  • Add dynamic audit configuration api: AuditregistrationV1alpha1Api kubernetes/kubernetes#67547
  • CSIPersistentVolume feature, i.e. PersistentVolumes with CSIPersistentVolumeSource, is GA. CSIPersistentVolume feature gate is now deprecated and will be removed according to deprecation policy. kubernetes/kubernetes#69929
  • Add support for CRD conversion webhook kubernetes/kubernetes#67006
  • CRD supports multi-version Schema, Subresources and AdditionalPrintColumns (NOTE that CRDs created prior to 1.13 populated the top-level additionalPrinterColumns field by default. To apply an update that changes to per-version additionalPrinterColumns, the top-level additionalPrinterColumns field must be explicitly set to null). kubernetes/kubernetes#70211
  • Add ability to control primary GID of containers through Pod Spec and PodSecurityPolicy kubernetes/kubernetes#67802
  • Refactor GlusterFS PV spec. This patch introduces glusterfsPersistentVolumeSource addition to glusterfsVolumeSource. All fields remains same as glusterfsVolumeSource with an addition of a new field called EndpointsNamespace to define namespace of endpoint in the spec. kubernetes/kubernetes#60195
  • Delete request's body parameter is optional kubernetes/kubernetes#70032
  • Make service environment variables optional kubernetes/kubernetes#68754
  • TokenReview now supports audience validation of tokens with audiences other than the kube-apiserver. kubernetes/kubernetes#62692

Breaking Change:

  • Model v1beta1WebhookClientConfig is renamed to AdmissionregistrationV1beta1WebhookClientConfig, to avoid naming conflict with ApiextensionsV1beta1WebhookClientConfig introduced in: kubernetes/kubernetes#67006
  • Delete request's body parameter is optional kubernetes/kubernetes#70032

v8.0.1

Bug Fix:

Security Fix:

v7.0.1

Security Fix:

v6.1.0

  • Python 3.7 support
  • Update to Kubernetes 1.10.10 API

Breaking Change:

  • ACTION REQUIRED Rename the currently being-used async parameter to async_req to support Python 3.7 because async is a reserved keyword in Python 3.7 kubernetes-client/gen#67
  • NOTE Python 3.7 was released after v6.0.0 release. It's not necessary to upgrade your client to v6.1.0 if you do not use Python 3.7+.

API change:

v8.0.0

New Feature:

v8.0.0b1

Bug Fix:

API Change:

v8.0.0a1

New Feature:

Bug Fix:

API Change:

  • Upon receiving a LIST request with expired continue token, the apiserver now returns a continue token together with the 410 "the from parameter is too old " error. If the client does not care about getting a list from a consistent snapshot, the client can use this token to continue listing from the next key, but the returned chunk will be from the latest snapshot kubernetes/kubernetes#67284
  • Introduces autoscaling/v2beta2 and custom_metrics/v1beta2, which implement metric selectors for Object and Pods metrics, as well as allowing AverageValue targets on Objects, similar to External metrics kubernetes/kubernetes#64097
  • Create "coordination.k8s.io" api group with "Lease" api in it kubernetes/kubernetes#64246
  • Added support to restore a volume from a volume snapshot data source: adds TypedLocalObjectReference in the core API and adds DataSource in PersistentVolumeClaimSpec kubernetes/kubernetes#67087
  • ProcMount added to SecurityContext and AllowedProcMounts added to PodSecurityPolicy to allow paths in the container's /proc to not be masked kubernetes/kubernetes#64283
  • Support both directory and block device for local volume plugin FileSystem VolumeMode kubernetes/kubernetes#63011
  • SCTP is now supported as additional protocol (alpha) alongside TCP and UDP in Pod, Service, Endpoint, and NetworkPolicy kubernetes/kubernetes#64973
  • RuntimeClass is a new API resource for defining different classes of runtimes that may be used to run containers in the cluster. Pods can select a RunitmeClass to use via the RuntimeClassName field. This feature is in alpha, and the RuntimeClass feature gate must be enabled in order to use it kubernetes/kubernetes#67737
  • The PodShareProcessNamespace feature to configure PID namespace sharing within a pod has been promoted to beta kubernetes/kubernetes#66507
  • To address the possibility dry-run requests overwhelming admission webhooks that rely on side effects and a reconciliation mechanism, a new field is being added to admissionregistration.k8s.io/v1beta1.ValidatingWebhookConfiguration and admissionregistration.k8s.io/v1beta1.MutatingWebhookConfiguration so that webhooks can explicitly register as having dry-run support. If a dry-run request is made on a resource that triggers a non dry-run supporting webhook, the request will be completely rejected, with "400: Bad Request". Additionally, a new field is being added to the admission.k8s.io/v1beta1.AdmissionReview API object, exposing to webhooks whether or not the request being reviewed is a dry-run kubernetes/kubernetes#66936
  • Add custom object status and scale api kubernetes-client/gen#72
  • dry-run: DELETE operations now support dryRun parameter kubernetes/kubernetes#65105
  • Default extensions/v1beta1 Deployment's ProgressDeadlineSeconds to MaxInt32 kubernetes/kubernetes#66581

v7.0.0

New Features:

v7.0.0b1

New Features:

v7.0.0a1

Breaking Change:

  • ACTION REQUIRED Rename the currently being-used async parameter to async_req to support Python 3.7 because it's a reserved keyword in Python 3.7 kubernetes-client/gen#67

Bug Fix:

API Change:

v6.0.0

v6.0.0b1

API change:

  • CustomObjectsApi: Add PATCH to CustomObjectsApi kubernetes-client/gen#53
  • Promoting the apiregistration.k8s.io (aggregation) to GA (ApiregistrationV1Api) kubernetes/kubernetes#58393
  • CoreV1Api: remove /proxy legacy API (deprecated since kubernetes v1.2). Use the /proxy subresources on objects that support HTTP proxying kubernetes/kubernetes#59884
  • The PodSecurityPolicy API has been moved to the policy/v1beta1 API group. The PodSecurityPolicy API in the extensions/v1beta1 API group is deprecated and will be removed in a future release. Authorizations for using pod security policy resources should change to reference the policy API group after upgrading to 1.11 kubernetes/kubernetes#54933
  • StorageV1beta1Api: Introduce new VolumeAttachment API Object kubernetes/kubernetes#54463
  • V1FlexPersistentVolumeSource: PersistentVolume flexVolume sources can now reference secrets in a namespace other than the PersistentVolumeClaim's namespace kubernetes/kubernetes#56460
  • ACTION REQUIRED: VolumeScheduling and LocalPersistentVolume features are beta and enabled by default. The PersistentVolume NodeAffinity alpha annotation is deprecated and will be removed in a future release kubernetes/kubernetes#59391
  • Allows HorizontalPodAutoscaler to use global metrics not associated with any Kubernetes object (for example metrics from a hoster service running outside of Kubernetes cluster) kubernetes/kubernetes#60096
  • v1.Pod now has a field to configure whether a single process namespace should be shared between all containers in a pod. This feature is in alpha preview. kubernetes/kubernetes#58716
  • delete_namespaced_service() now takes an required body (delete option) parameter. Refactor service storage to remove registry wrapper kubernetes/kubernetes#59510

Documentation update:

v5.0.0

  • No changes. The same as v5.0.0b1.

v5.0.0b1

  • Update to Kubernetes 1.9 cluster
  • Label selector for pods is now required and must match the pod template's labels for v1beta2 StatefulSetSpec, ReplicaSetSpec, DaemonSetSpec and DeploymentSpec kubernetes/kubernetes#55357
  • The dynamic admission webhook is split into two kinds, mutating and validating. The kinds have changed completely and old code must be ported to admissionregistration.k8s.io/v1beta1 - MutatingWebhookConfiguration and ValidatingWebhookConfiguration kubernetes/kubernetes#55282
  • DaemonSet, Deployment, ReplicaSet, and StatefulSet have been promoted to GA and are available in the apps/v1 group version kubernetes/kubernetes#53679
  • Introduce new storage.k8s.io/v1alpha1 VolumeAttachment object kubernetes/kubernetes#54463
  • Introduce core/v1 RBDPersistentVolumeSource kubernetes/kubernetes#54302
  • StatefulSet status now has support for conditions kubernetes/kubernetes#55268
  • DaemonSet status now has support for conditions kubernetes/kubernetes#55272

v4.0.0

  • api change V1PersistentVolumeSpec to V1ScaleIOPersistentVolumeSource #397.

v4.0.0b1

  • Make sure PyPI source distribution is complete with all files from the root directory

v4.0.0a1

  • Update to Kubernetes 1.8 cluster
  • IntOrString is now object thus it can be int or string. #18 #359
  • Adding stream package to support calls like exec. The old way of calling them is deprecated. See Troubleshooting).
  • config.http_proxy_url is deprecated. use configuration.proxy instead.
  • Configuration is not a singleton object anymore. Please use Configuration.set_default to change default configuration.
  • Configuration class does not support ws_streaming_protocol anymore. In ApiClient.set_default_header set sec-websocket-protocol to the preferred websocket protocol.

v3.0.0

v3.0.0b1

v3.0.0a1

  • Update client to kubernetes 1.7
  • Support ThirdPartyResources (TPR) and CustomResourceDefinitions (CRD). Note that TPR is deprecated in kubernetes #251 #201
  • Better dependency management #136
  • Add support for python3.6 #244

v1.0.2

  • Bugfix: support RFC6902 'json-patch' operations #187

v2.0.0

  • No changes. The same as v2.0.0b1.

v2.0.0b2

  • Bugfix: support RFC6902 'json-patch' operations #187

v1.0.1

  • Bugfix: urllib3 1.21 fails tests, Excluding version 1.21 from dependencies #197

v2.0.0b1

  • Add support for attach API calls #180
  • Bugfix: token file should not be decoded #182
  • Inline primitive models (e.g. v1.Time and resource.Quantity) #179
  • Bugfix: urllib3 1.21 fails tests, Excluding version 1.21 from dependencies #197

v2.0.0a1

  • Update to kubernetes 1.6 spec #169

v1.0.0

  • Bugfix: blocking exec call should remove channel metadata #140
  • Add close method to websocket api of interactive exec #145

v1.0.0b3

  • Bugfix: Missing websocket-client dependency #131

v1.0.0b2

  • Support exec calls in both interactive and non-interactive mode #58

v1.0.0b1

  • Support insecure-skip-tls-verify config flag #99
  • Added example for using yaml files as models #63
  • Added end to end tests #41, #94
  • Bugfix: Fix ValueError in list_namespaced_config_map #104
  • Bugfix: Export missing models #101
  • Bugfix: Patch operations #93

v1.0.0a5

v1.0.0a4

  • Bugfix: Fixed broken config loader #77

v1.0.0a3

  • Add context switch to kube config loader #46
  • Add default kube config location #64
  • Add support for accessing multiple clusters #7
  • Bugfix: Python client does not resolve relative paths in kubeconfig #68
  • Bugfix: read_namespaced_pod_log get None response #57
  • Improved test coverage #54
  • Improved client generator #49

v1.0.0-alpha2

  • auto-generated client from K8s OpenAPI spec
  • kube-config support
  • in-cluster config support: Run scripts inside kubernetes cluster
  • watch support

v1.0.0-alpha1

Skipped because of a failed initial release.