groupadd docker

usermod -aG docker qucx

还是报错：

“permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Head "http://%2Fvar%2Frun%2Fdocker.sock/_ping": dial unix /var/run/docker.sock: connect: permission denied”

解决办法：chmod 777 /var/run/docker.sock