etcd Cluster fails to start about vault-operator HOT 1 OPEN

$ kubectl get all,vault,etcd -l 'app in (etcd,vault)' 
NAME                             READY   STATUS    RESTARTS   AGE
pod/vault-svc-6bc5678fcc-l7t2r   1/2     Running   1          24m
pod/vault-svc-6bc5678fcc-znmwj   1/2     Running   1          24m
pod/vault-svc-etcd-9s974hwgj5    1/1     Running   0          25m
pod/vault-svc-etcd-gvschtkphl    0/1     Error     0          25m
NAME                            TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)                      AGE
service/vault-svc               ClusterIP   10.233.15.50   <none>        8200/TCP,8201/TCP,9102/TCP   24m
service/vault-svc-etcd          ClusterIP   None           <none>        2379/TCP,2380/TCP            25m
service/vault-svc-etcd-client   ClusterIP   10.233.10.40   <none>        2379/TCP                     25m
NAME                        READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/vault-svc   0/2     2            0           24m
replicaset.apps/vault-svc-6bc5678fcc   2         2         0       24m
etcdcluster.etcd.database.coreos.com/vault-svc-etcd   25m