forked from kelseyhightower/kubestack
Provision a Kubernetes cluster with Terraform on Openstack
Ready for testing. Over the next couple of weeks the repo should be generic enough for reuse with complete documentation.
Will install a single controller node and two compute nodes by default, can increase or decrease compute nodes using the Terraform variable compute_count.
- Install Terraform
- Upload a CoreOS image to glance. (make sure this is from the alpha channel which contains kubelet)
Terraform will be used to declare and provision a Kubernetes cluster. By default it will be a single controller with a single compute node. You can add more nodes by adjusting the compute_workers variable.
The compute workers (for now) do not have a floating ip, this means to ssh to them you must ssh -A to the controller node first.
Ensure your local ssh-agent is running and your ssh key has been added. This step is required by the terraform provisioner.
$ eval $(ssh-agent -s)
$ ssh-add ~/.ssh/id_rsa
Ensure that you have your Openstack credentials loaded into environment variables. Likely via a command similar to:
$ source ~/.stackrc
If you wish to re-use previously generated SSL key/certs for CA and admin, simply add -var "generate_ssl=0" \.
It can take some time for the kubernetes-api to come online. Do not be surprised if you see a series of failed curl commands, this is just a terraform provisioning script waiting until it can access the api before moving on.
$ cd terraform
$ export MY_IP=$(curl -s icanhazip.com)
$ terraform plan \
-var "username=$OS_USERNAME" \
-var "password=$OS_PASSWORD" \
-var "tenant=$OS_TENANT_NAME" \
-var "auth_url=$OS_AUTH_URL" \
-var "whitelist_network=${MY_IP}/32"
Refreshing Terraform state prior to plan...
...
...
+ template_file.discovery_url
rendered: "" => "<computed>"
template: "" => "templates/discovery_url"
Plan: 12 to add, 0 to change, 0 to destroy.
$ terraform apply \
-var "username=$OS_USERNAME" \
-var "password=$OS_PASSWORD" \
-var "tenant=$OS_TENANT_NAME" \
-var "auth_url=$OS_AUTH_URL" \
-var "whitelist_network=${MY_IP}/32"
...
...
Apply complete! Resources: 12 added, 0 changed, 0 destroyed.
The state of your infrastructure has been saved to the path
below. This state is required to modify and destroy your
infrastructure, so keep it safe. To inspect the complete state
use the `terraform show` command.
State path: terraform.tfstate
Outputs:
kubernetes-controller = $ ssh -A [email protected]
$ ssh -A [email protected]
$ kubectl config use-context kubernetes
switched to context "kubernetes".
$ kubectl config view
apiVersion: v1
clusters:
- cluster:
insecure-skip-tls-verify: true
server: https://127.0.0.1:6443
name: kubernetes
contexts:
- context:
cluster: kubernetes
user: admin
name: kubernetes
current-context: kubernetes
kind: Config
preferences: {}
users:
- name: admin
user:
token: kubernetes
$ kubectl get nodes
NAME LABELS STATUS AGE
10.230.7.23 kubernetes.io/hostname=10.230.7.23 Ready 5m
$ kubectl run my-nginx --image=nginx --replicas=1 --port=80
replicationcontroller "my-nginx" created
$ kubectl expose rc my-nginx --port=80 --type=LoadBalancer
service "my-nginx" exposed
$ kubectl get svc my-nginx
NAME CLUSTER_IP EXTERNAL_IP PORT(S) SELECTOR AGE
my-nginx 10.200.43.104 80/TCP run=my-nginx 6s
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
my-nginx-k1zoe 1/1 Running 0 1m
$ curl 10.200.43.104
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
$ kubectl delete rc my-nginx
replicationcontroller "my-nginx" deleted
$ kubectl delete svc my-nginx
service "my-nginx" deleted
$ kubectl create -f /etc/kubernetes/addons/kube-ui-rc.yaml \
--namespace=kube-system
$ kubectl create -f /etc/kubernetes/addons/kube-ui-svc.yaml \
--namespace=kube-system
$ kubectl create -f /etc/kubernetes/addons/kube-dns-rc.yaml \
--namespace=kube-system
$ kubectl create -f /etc/kubernetes/addons/kube-dns-svc.yaml \
--namespace=kube-system
Once you're done with it, don't forget to nuke the whole thing.
$ terraform destroy \
-var "username=$OS_USERNAME" \
-var "password=$OS_PASSWORD" \
-var "tenant=$OS_TENANT_NAME" \
-var "auth_url=$OS_AUTH_URL"
Do you really want to destroy?
Terraform will delete all your managed infrastructure.
There is no undo. Only 'yes' will be accepted to confirm.
Enter a value: yes
...
...
openstack_compute_secgroup_v2.kubernetes_controller: Destruction complete
openstack_compute_secgroup_v2.kubernetes_internal: Destruction complete
Apply complete! Resources: 0 added, 0 changed, 12 destroyed.