karmada operator add the support for custom dns domain

[zhzhuang-zju]

What type of PR is this?
/kind feature

What this PR does / why we need it:

karmada/operator/pkg/apis/operator/v1alpha1/type.go

Lines 173 to 178 in 4d0181c

	// Networking contains elements describing cluster's networking configuration
	type Networking struct {
	// DNSDomain is the dns domain used by k8s services. Defaults to "cluster.local".
	// +optional
	DNSDomain *string `json:"dnsDomain,omitempty"`
	}

Currently, the Karmada API provides a field to configure a custom DNS domain, but this capability has not been implemented in the actual installation process. I hope to introduce support for custom DNS domains in the Karmada operator.

Which issue(s) this PR fixes:
Parts of #5722

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

karmada-operator: add the support for custom dns domain

[karmada-bot]

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[zhzhuang-zju]

Local Verifcatrion:

• Create a cluster with dnsDomain set to cluster.remote.

# dns/cluster.config
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
name: member5
networking:
nodes:
  - role: control-plane
    kubeadmConfigPatches:
      - |
        ---
        apiVersion: kubeadm.k8s.io/v1beta3
        kind: ClusterConfiguration
        networking:
          dnsDomain: "cluster.remote"

 $ kind create cluster --config dns/cluster.config --kubeconfig ~/.kube/member5.config
 $ kubectl get cm --namespace kube-system coredns -oyaml
 ...
         kubernetes cluster.remote in-addr.arpa ip6.arpa {
 ...
 $ cat /etc/resolv.conf
search default.svc.cluster.remote svc.cluster.remote cluster.remote openstacklocal

• deploy karmada-operator and install karmada(Using the one-click installation script provided by add ci for karmada operator #5519)

# operator/config/samples/karmada-sample.yaml
  hostCluster:
    networking:
      dnsDomain: cluster.remote

$ hack/deploy-karmada-operator.sh ~/.kube/member5.config member5
$ hack/deploy-karmada-by-operator.sh ~/.kube/member5.config member5 karmada-apiserver v1.11.1 true https://github.com/karmada-io/karmada/releases/download/v1.11.1/crds.tar.gz

• Before(without the support for custom dns domain)

$ kubectl get pods -ntest
NAME                                     READY   STATUS             RESTARTS        AGE
karmada-demo-apiserver-f99cf9578-rcwfr   0/1     CrashLoopBackOff   6 (37s ago)     9m15s
karmada-demo-etcd-0                      0/1     Error              6 (3m25s ago)   10m
$ kubectl logs -p --namespace test karmada-demo-etcd-0
{"level":"warn","ts":"2024-10-23T03:13:15.050098Z","caller":"netutil/netutil.go:121","msg":"failed to resolve URL Host","url":"http://karmada-demo-etcd-0.karmada-demo-etcd.test.svc.cluster.local:2380","host":"karmada-demo-etcd-0.karmada-demo-etcd.test.svc.cluster.local:2380","retry-interval":"1s","error":"lookup karmada-demo-etcd-0.karmada-demo-etcd.test.svc.cluster.local on 10.96.0.10:53: no such host"}
{"level":"fatal","ts":"2024-10-23T03:13:15.914938Z","caller":"etcdmain/etcd.go:204","msg":"discovery failed","error":"--initial-cluster has karmada-demo-etcd-0=http://karmada-demo-etcd-0.karmada-demo-etcd.test.svc.cluster.local:2380 but missing from --initial-advertise-peer-urls=http://10.244.0.9:2380 (failed to resolve \"http://karmada-demo-etcd-0.karmada-demo-etcd.test.svc.cluster.local:2380\" (lookup karmada-demo-etcd-0.karmada-demo-etcd.test.svc.cluster.local on 10.96.0.10:53: no such host))","stacktrace":"go.etcd.io/etcd/server/v3/etcdmain.startEtcdOrProxyV2\n\tgo.etcd.io/etcd/server/v3/etcdmain/etcd.go:204\ngo.etcd.io/etcd/server/v3/etcdmain.Main\n\tgo.etcd.io/etcd/server/v3/etcdmain/main.go:40\nmain.main\n\tgo.etcd.io/etcd/server/v3/main.go:31\nruntime.main\n\truntime/proc.go:267"}

• After(with the support for custom dns domain)

$ kubectl get pods -ntest
NAME                                                    READY   STATUS    RESTARTS   AGE
karmada-demo-aggregated-apiserver-5fcb5fbb88-x55mb      1/1     Running   0          5m7s
karmada-demo-apiserver-c6465f7b4-ls79h                  1/1     Running   0          5m19s
karmada-demo-controller-manager-778bc5886d-ds9p6        1/1     Running   0          4m28s
karmada-demo-descheduler-689c679547-mfxqt               1/1     Running   0          4m28s
karmada-demo-etcd-0                                     1/1     Running   0          5m20s
karmada-demo-kube-controller-manager-78cd4fbcff-n75nk   1/1     Running   0          4m28s
karmada-demo-metrics-adapter-5cbd5dfcd5-krxbk           1/1     Running   0          4m28s
karmada-demo-metrics-adapter-5cbd5dfcd5-pf87h           1/1     Running   0          4m28s
karmada-demo-scheduler-7569cf8678-bp7d2                 1/1     Running   0          4m28s
karmada-demo-search-ddb4979f9-gbwz8                     1/1     Running   0          103s
karmada-demo-webhook-7bcd6f9dd7-9tljx                   1/1     Running   0          4m28s

$ ginkgo -v --race --trace -p  --focus="[BasicPropagation] propagation testing deployment propagation testing" ./test/e2e/
Ran 3 of 241 Specs in 26.319 seconds
SUCCESS! -- 3 Passed | 0 Failed | 0 Pending | 238 Skipped


Ginkgo ran 1 suite in 1m29.083269686s
Test Suite Passed

[zhzhuang-zju]

cc @whitewindmills @calvin0327 @jabellard

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 73.80952% with 11 lines in your changes missing coverage. Please review.

Project coverage is 40.86%. Comparing base (60e8e34) to head (796514a).

Files with missing lines	Patch %	Lines
operator/pkg/controlplane/apiserver/apiserver.go	80.00%	0 Missing and 2 partials ⚠️
operator/pkg/controlplane/etcd/util.go	0.00%	2 Missing ⚠️
operator/pkg/init.go	0.00%	2 Missing ⚠️
operator/pkg/controlplane/etcd/etcd.go	90.90%	0 Missing and 1 partial ⚠️
operator/pkg/controlplane/search/search.go	75.00%	0 Missing and 1 partial ⚠️
operator/pkg/tasks/init/component.go	0.00%	1 Missing ⚠️
operator/pkg/tasks/init/etcd.go	0.00%	1 Missing ⚠️
operator/pkg/tasks/init/upload.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5727      +/-   ##
==========================================
+ Coverage   40.85%   40.86%   +0.01%     
==========================================
  Files         651      651              
  Lines       55256    55267      +11     
==========================================
+ Hits        22574    22586      +12     
  Misses      31241    31241              
+ Partials     1441     1440       -1     

Flag	Coverage Δ
unittests	40.86% <73.80%> (+0.01%)	⬆️

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