Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

我在重启docker 的时候报这个错误
Mar 28 23:12:53 node01 systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
Mar 28 23:12:53 node01 systemd[1]: Failed to start Docker Application Container Engine.
Mar 28 23:12:53 node01 systemd[1]: Unit docker.service entered failed state.
Mar 28 23:12:53 node01 systemd[1]: docker.service failed.
Mar 28 23:12:55 node01 systemd[1]: docker.service holdoff time over, scheduling restart.
Mar 28 23:12:55 node01 systemd[1]: Stopped Docker Application Container Engine.
Mar 28 23:12:55 node01 systemd[1]: start request repeated too quickly for docker.service
Mar 28 23:12:55 node01 systemd[1]: Failed to start Docker Application Container Engine.
Mar 28 23:12:55 node01 systemd[1]: Unit docker.service entered failed state.
Mar 28 23:12:55 node01 systemd[1]: docker.service failed.

使用：sudo systemctl status docker.service 查看的时候，只有客户端启动了，服务并没有启动，

[root@node01 ~]# vim /etc/docker/daemon.json

解决办法：修改daemon.json 文件，把里面的内容删除，变成一个空文件
再重新启动下

[root@node01 ~]# systemctl daemon-reload
[root@node01 ~]# systemctl restart docker
[root@node01 ~]# systemctl status docker.service

此时再查询，已经启动起来了