1、启动docker
systemctl restart docker.service
报错后用以下命令查看docker状态
root@X555LB:~# systemctl status docker.service
● docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; disabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Sun 2019-04-28 18:52:57 CST; 3min 28s ago
Docs: https://docs.docker.com
Process: 28689 ExecStart=/usr/bin/dockerd -H fd:// (code=exited, status=1/FAILURE)
Main PID: 28689 (code=exited, status=1/FAILURE)
4月 28 18:52:57 X555LB systemd[1]: docker.service: Service hold-off time over, scheduling restart.
4月 28 18:52:57 X555LB systemd[1]: docker.service: Scheduled restart job, restart counter is at 3.
4月 28 18:52:57 X555LB systemd[1]: Stopped Docker Application Container Engine.
4月 28 18:52:57 X555LB systemd[1]: docker.service: Start request repeated too quickly.
4月 28 18:52:57 X555LB systemd[1]: docker.service: Failed with result ‘exit-code’.
4月 28 18:52:57 X555LB systemd[1]: Failed to start Docker Application Container Engine.
2、运行dockerd命令
root@X555LB:~# dockerd
报错，大概意思是docker支持的有效存储驱动有devicemapper, overlay2，可能docker默认的存储驱动不是这两个，更改为有效的存储驱动即可。
Error starting daemon: error initializing graphdriver: /var/lib/docker contains several valid graphdrivers: devicemapper, overlay2; Please cleanup or explicitly choose storage driver (-s )
3、更改存储驱动
gedit /etc/docker/daemon.json
{
"registry-mirrors": ["https://2elq31uu.mirror.aliyuncs.com"],
"storage-driver": "devicemapper"
}
4、重启docker即可
systemctl restart docker.service