kube-etcd-controller

Initialize the TPR

(TODO: auto create TPR when deploy the controller)

$ cat example/etcd-clusters-tpr.yaml

apiVersion: extensions/v1beta1
kind: ThirdPartyResource
description: "Managed etcd clusters"
metadata:
  name: "etcd-cluster.coreos.com"
versions:
  - name: v1
  - name: v2

$ kubectl create -f example/etcd-clusters-tpr.yaml

$ kubectl get thirdpartyresources
NAME                      DESCRIPTION             VERSION(S)
etcd-cluster.coreos.com   Managed etcd clusters   v1,v2

Deploy kube-etcd-controller

$ kubectl create -f example/etcd-controller.yaml

Create an etcd cluster

$ cat example/example-etcd-cluster.yaml

apiVersion: "coreos.com/v1"
kind: "EtcdCluster"
metadata:
  name: "example-etcd-cluster"
size: 3

$ kubectl create -f example/example-etcd-cluster.yaml

$ kubectl get pods
NAME                       READY     STATUS    RESTARTS   AGE
example-etcd-cluster-0000   1/1       Running   0          5s
example-etcd-cluster-0001   1/1       Running   0          5s
example-etcd-cluster-0002   1/1       Running   0          5s

$ kubectl get services
NAME                        CLUSTER-IP    EXTERNAL-IP   PORT(S)    AGE
example-etcd-cluster-0000   10.0.125.56   <none>        2380/TCP   49s
example-etcd-cluster-0001   10.0.189.13   <none>        2380/TCP   49s
example-etcd-cluster-0002   10.0.87.110   <none>        2380/TCP   49s
kubernetes                  10.0.0.1      <none>        443/TCP    8m

$ kubectl log example-etcd-cluster-0000
...
2016-08-05 00:33:32.453768 I | api: enabled capabilities for version 3.0
2016-08-05 00:33:32.454178 N | etcdmain: serving insecure client requests on 0.0.0.0:2379, this is strongly discouraged!

Destory an existing etcd cluster

$ kubectl delete -f example/example-etcd-cluster.yaml

$ kubectl get pods
NAME                       READY     STATUS    RESTARTS   AGE

Try cluster reocvery

Simulate a pod failure by simply delete it

$ kubectl delete pod example-etcd-cluster-0000

etcd controller will recover the failure by creating a new pod example-etcd-cluster-0003

$ kubectl get pods
NAME                       READY     STATUS    RESTARTS   AGE
example-etcd-cluster-0001   1/1       Running   0          5s
example-etcd-cluster-0002   1/1       Running   0          5s
example-etcd-cluster-0003   1/1       Running   0          5s