docker存储目录修改

1.停止docker服务
systemctl stop docker
2.创建新的docker目录，执行命令df -h,找一个大的磁盘
如在 /opt目录下面建了/opt/docker/lib目录
 mkdir -p /opt/docker/lib
3.迁移/var/lib/docker目录下面的文件到/opt/docker/lib
迁移后的完成docker路径：/opt/lib/docker
cp  -r /var/lib/docker/  /opt/docker/lib/

目录授权

chmod -R 777 /opt/docker/lib

4.配置 /etc/systemd/system/docker.service.d/devicemapper.conf
查看/etc/systemd/system/docker.service.d目录及devicemapper.conf是否存在。如果不存在，就新建
mkdir -p /etc/systemd/system/docker.service.d/
vi /etc/systemd/system/docker.service.d/devicemapper.conf
devicemapper.conf添加如下内容：

[Service]
Type=notify
NotifyAccess=main
EnvironmentFile=-/run/containers/registries.conf
EnvironmentFile=-/etc/sysconfig/docker
EnvironmentFile=-/etc/sysconfig/docker-storage
EnvironmentFile=-/etc/sysconfig/docker-network
Environment=GOTRACEBACK=crash
Environment=DOCKER_HTTP_HOST_COMPAT=1
Environment=PATH=/usr/libexec/docker:/usr/bin:/usr/sbin
ExecStart=/usr/bin/dockerd-current 
          --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current 
          --default-runtime=docker-runc 
          --exec-opt native.cgroupdriver=systemd 
          --userland-proxy-path=/usr/libexec/docker/docker-proxy-current 
          --init-path=/usr/libexec/docker/docker-init-current 
          --seccomp-profile=/etc/docker/seccomp.json 
          --graph=/opt/docker/lib
          $OPTIONS 
          $DOCKER_STORAGE_OPTIONS 
          $DOCKER_NETWORK_OPTIONS 
          $ADD_REGISTRY 
          $BLOCK_REGISTRY 
          $INSECURE_REGISTRY 
	  $REGISTRIES 
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=1048576
LimitNPROC=1048576
LimitCORE=infinity
TimeoutStartSec=0
Restart=on-abnormal
KillMode=process

5. 重启docker
systemctl daemon-reload
systemctl restart docker
systemctl enable docker

6.确认Docker Root Dir修改是否已经生效
[root@iZbp1jcwx7sfb1yrnvpg84Z docker]# docker info
...
Docker Root Dir: /opt/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/

7.如果启动容器失败可以查看容器日志

docker logs -f 容器id/容器name