报错信息dial unix /var/run/docker.sock: connect: permission denied
master@localhost:~$ docker ps
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/json: dial unix /var/run/docker.sock: connect: permission denied
原因：默认情况下，只有root和docker组用户才可以docker引擎的Unix socket，将当前用户加入docker组即可
master@localhost:~$ sudo usermod -aG docker $USER
