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

报错信息：Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
解决方法：
systemctl daemon-reload
systemctl restart docker.service
此种提示只是守护进程没有开启，重新加载一下守护进程，再启动服务就OK了