docker 启动报错权限问题：
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/images/json”: dial unix /var/run/docker.sock: connect: permission denied
解决：==> 将 docker 加入 sudo 组
sudo groupadd docker # 添加docker用户组
sudo gpasswd -a $USER docker # 将登入用户加入到docker用户组中
newgrp docker # 更新用户组
docker ps # 验证