CentOS7上启动Docker出错

服务器是阿里云

root@iZ23aqvbprnZ ~]# sudo service docker start
Redirecting to /bin/systemctl start  docker.service
Job for docker.service failed. See 'systemctl status docker.service' and 'journalctl -xn' for details.
[root@iZ23aqvbprnZ ~]# systemctl status docker.service -l
docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled)
   Active: failed (Result: timeout) since 日 2015-11-08 00:07:24 CST; 46s ago
     Docs: https://docs.docker.com
 Main PID: 7339

11月 08 00:05:08 iZ23aqvbprnZ systemd[1]: Starting Docker Application Container Engine...
11月 08 00:05:08 iZ23aqvbprnZ docker[7339]: time="2015-11-08T00:05:08.643868013+08:00" level=info msg="API listen on /var/run/docker.sock"
11月 08 00:05:08 iZ23aqvbprnZ docker[7339]: time="2015-11-08T00:05:08.669962555+08:00" level=warning msg="Usage of loopback devices is strongly discouraged for production use. Please use `--storage-opt dm.thinpooldev` or use `man docker` to refer to dm.thinpooldev section."
11月 08 00:06:38 iZ23aqvbprnZ systemd[1]: docker.service operation timed out. Terminating.
11月 08 00:07:24 iZ23aqvbprnZ systemd[1]: Failed to start Docker Application Container Engine.
11月 08 00:07:24 iZ23aqvbprnZ systemd[1]: Unit docker.service entered failed state.