Docker实践：Cannot connect to the Docker daemon.

查看docker daemon是否在运行

[root@localhost openec]# ps aux | grep docker

root 3030 0.0 0.0 112656 984 pts/0 S+ 16:20 0:00 grep --color=auto docker

启动docker

[root@localhost openec]# service docker start

Redirecting to /bin/systemctl start docker.service