简单说，不啰嗦
默认Docker位置为：/var/lib/docker
可用sudo docker info | grep Root Dir 看
Docker Root Dir: /var/lib/docker
停 service docker stop
迁移 mv /var/lib/docker /ndata/docker
软连 ln -s /ndata/docke /var/lib/docker
确认 ls -al /var/lib/docker
启动sudo systemctl start docker
