docker daemon.json

 /etc/docker/daemon.json
{
  "registry-mirrors": ["https://akchsmlh.mirror.aliyuncs.com","http://hub-mirror.c.163.com","https://registry.docker-cn.com","https://docker.mirrors.ustc.edu.cn"],
  "log-driver": "json-file",
  "log-opts": {"max-size":"100m", "max-file":"3"},
  "data-root":"/data/docker"
}

备注老版本用graph，新版本data-root

停止服务（systemctl stop docker.socket如果失败不影响）

systemctl stop docker.socket
systemctl stop docker

cp -r /var/lib/docker /data 

##重新加载文件
sudo systemctl daemon-reload

##重启docker
sudo systemctl restart docker