1、停止docker服务
systemctl stop docker
2、创建足够空间新目录，迁移文件到新目录
rsync -avz /var/lib/docker/ /home/var/lib/docker
3、配置文件修改
vi /usr/lib/systemd/system/docker.service
//服务配置文件添加 graph
[Service]
ExeStart=/usr/bin/docker --graph=/home/var/lib/docker
4、重载daemon配置，启动docker
systemctl daemon-reload
systemctl start docker
5、查看配置生效后删除原目录
docker info
...
Docker Root Dir:/home/var/lib/docker
