一、环境：
centos7.x 系统，已经装好 docker-ce 服务包
二、查看当前 docker 的存储路径
[root@VM-13cb107e-b518-4d7b-a63f-3f0a5499ec76 ~]$ docker info |grep Dir
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled
WARNING: the devicemapper storage-driver is deprecated, and will be removed in a future release.
WARNING: devicemapper: usage of loopback devices is strongly discouraged for production use.
Use `--storage-opt dm.thinpooldev` to specify a custom block storage device.
Docker Root Dir: /var/lib/docker ## docker默认的存储路径
三、关闭 docker 服务
[root@VM-13cb107e-b518-4d7b-a63f-3f0a5499ec76 ~]$ systemctl stop docker ## 关闭docker服务 [root@VM-13cb107e-b518-4d7b-a63f-3f0a5499ec76 ~]$ systemctl status docker ## 查看docker服务状态
四、将原有数据迁移至新目录
[root@@VM-13cb107e-b518-4d7b-a63f-3f0a5499ec76 local]# mkdir /home/service/docker -p
[root@@VM-13cb107e-b518-4d7b-a63f-3f0a5499ec76 local]# mv /var/lib/docker/* /home/service/docker/
五、修改 docker.service 配置文件，使用 --graph 参数指定存储位置
[root@VM-13cb107e-b518-4d7b-a63f-3f0a5499ec76 local]# vim /usr/lib/systemd/system/docker.service
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --graph /home/service/docker
六、重新加载配置文件
[root@VM-13cb107e-b518-4d7b-a63f-3f0a5499ec76 local]# systemctl daemon-reload
七、启动 docker 服务
[root@VM-13cb107e-b518-4d7b-a63f-3f0a5499ec76 local]# systemctl start docker
[root@VM-13cb107e-b518-4d7b-a63f-3f0a5499ec76 local]# systemctl enable docker
[root@VM-13cb107e-b518-4d7b-a63f-3f0a5499ec76 local]# systemctl status docker
八、查看修改是否成功
[root@VM-13cb107e-b518-4d7b-a63f-3f0a5499ec76 ~]# docker info | grep Dir
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled
WARNING: the devicemapper storage-driver is deprecated, and will be removed in a future release.
WARNING: devicemapper: usage of loopback devices is strongly discouraged for production use.
Use `--storage-opt dm.thinpooldev` to specify a custom block storage device.
Docker Root Dir: /data/docker #查看修改成功