etcdctl_cmd() {
CLUSTER=${1}
VM=${2}
shift 2
kubectl_cmd ${VM} -n kube-system exec -t ${CLUSTER}-etcd-${VM} -- etcdctl ${@}
}
etcdctl_member_list() {
EXTRA_ARGS=${@}
etcdctl_cmd ${CLUSTER} ${VM} member list -w json | jq -r '.members[].name' | sort