为什么CoreOS不会自动启动etcd2，尽pipe我的cloud-config是这样说的？

我在Google Compute Engine实例上运行CoreOS beta 991.1.0，其中cloud-config是通过user_data元数据variablesconfiguration的。 我的云configuration看起来像这样：

 #cloud-config write_files: - path: "/etc/kubernetes/kube.conf" permissions: "0644" owner: "root" content: | apiVersion: v1 kind: Config clusters: - name: kube cluster: server: https://127.0.0.1:443 certificate-authority: /etc/kubernetes/ssl/ca.pem users: - name: kubelet user: client-certificate: /etc/kubernetes/ssl/master-client.pem client-key: /etc/kubernetes/ssl/master-client-key.pem contexts: - context: cluster: kube user: kubelet ssh_authorized_keys: - "SECRET" coreos: etcd2: discovery: https://discovery.etcd.io/106b575a45f2abefdaea40ebba4d0d84 initial-advertise-peer-urls: https://$private_ipv4:2380 listen-peer-urls: https://$private_ipv4:2380 listen-client-urls: https://0.0.0.0:2379 advertise-client-urls: https://$private_ipv4:2379 units: - name: etcd2.service command: start drop-ins: - name: 30-certificates.conf content: | [Service] # Client Env Vars Environment=ETCD_TRUSTED_CA_FILE=/etc/kubernetes/ssl/ca.pem Environment=ETCD_CERT_FILE=/etc/kubernetes/ssl/master-client.pem Environment=ETCD_KEY_FILE=/etc/kubernetes/ssl/master-client-key.pem # Peer Env Vars Environment=ETCD_PEER_TRUSTED_CA_FILE=/etc/kubernetes/ssl/ca.pem Environment=ETCD_PEER_CERT_FILE=/etc/kubernetes/ssl/master-peer.pem Environment=ETCD_PEER_KEY_FILE=/etc/kubernetes/ssl/master-peer-key.pem - name: fleet.service command: start - name: swap.service command: start content: | [Unit] Description=Turn on swap [Service] Type=oneshot Environment="SWAPFILE=/swap" RemainAfterExit=true ExecStartPre=/usr/sbin/losetup -f $SWAPFILE ExecStart=/usr/bin/sh -c "/sbin/swapon $(/usr/sbin/losetup -j $SWAPFILE | /usr/bin/cut -d : -f 1)" ExecStop=/usr/bin/sh -c "/sbin/swapoff $(/usr/sbin/losetup -j $SWAPFILE | /usr/bin/cut -d : -f 1)" ExecStopPost=/usr/bin/sh -c "/usr/sbin/losetup -d $(/usr/sbin/losetup -j $SWAPFILE | /usr/bin/cut -d : -f 1)" [Install] WantedBy=local.target 

但是，即使我已经configuration了etcd2启动引导，它不。 为什么不会自动启动etcd2？