切换机器多次忘记，仅以此记录
创建用户组
sudo groupadd docker
添加当前用户
sudo usermod -aG docker ${USER}
查看效果
docker run hello-world
如果成功运行并且弹出
WARNING: Error loading config file: /home/jsk/.docker/config.json: stat /home/jsk/.docker/config.json: permission
可通过修改owner，添加权限
sudo chown "$USER":"$USER" /home/"$USER"/.docker -R sudo chmod g+rwx "$HOME/.docker" -R
原文：https://www.cnblogs.com/BJ-python-1907/p/12327546.html