docker文件过大，Docker容器引擎，迁移/var/lib/docker/到本机其它挂载分区或远程主机的某个分区。docker迁移

docker文件过大，Docker容器引擎，迁移/var/lib/docker/到本机其它挂载分区或远程主机的某个分区。docker迁移。

0. 迁移前检查镜像和容器

docker images 和docker ps -a

1. 停止Docker引擎

systemctl stop docker

2. 创建新的docker目录

mkdir -p /data/docker/

3、复制文件

cp -R /var/lib/docker/* /data/docker

4、编写devicemapper.conf

依次创建目录和文件。

vi /etc/systemd/system/docker.service.d/devicemapper.conf

内如如下：

[Service]
ExecStart=
ExecStart=/usr/bin/dockerd  --graph=/data/docker

5、重新加载docker

systemctl daemon-reload

systemctl restart docker

systemctl enable docker

6、 迁移后检查

docker info

查看结果是不是

Docker Root Dir: /data/docker

如果报错

docker.service: Service has more than one ExecStart= setting, which is only

Loaded: bad-setting (Reason: Unit docker.service has a bad unit file setting.)

之类的，就执行如下命令：

systemctl unmask docker.service
systemctl unmask docker.socket
systemctl start docker.service
systemctl status docker

再重试。

启动命令也可以service docker start