迁移docker镜像数据并修改Docker Root Dir

查看当前docker的信息

dokcer info

docker info
Client: Docker Engine - Community
 Version:    24.0.7
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.11.2
    Path:     /usr/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.21.0
    Path:     /usr/libexec/docker/cli-plugins/docker-compose

Server:
 Containers: 20
  Running: 17
  Paused: 0
  Stopped: 3
 Images: 25
 Server Version: 24.0.7
 Storage Driver: overlay2
  Backing Filesystem: xfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: d8f198a4ed8892c764191ef7b3b06d8a2eeb5c7f
 runc version: v1.1.10-0-g18a0cb0
 init version: de40ad0
 Security Options:
  seccomp
   Profile: builtin
 Kernel Version: 3.10.0-1160.el7.x86_64
 Operating System: CentOS Linux 7 (Core)
 OSType: linux
 Architecture: x86_64
 CPUs: 40
 Total Memory: 30.87GiB
 Name: DIPCC
 ID: b23ec318-2de4-40a4-857a-b34c16f926f2
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Registry Mirrors:
  https://docker.mirrors.ustc.edu.cn/
 Live Restore Enabled: false

停止docker

systemctl stop docker

修改/ect/docker/daemon.json

{
  "registry-mirrors": [
    "https://docker.mirrors.ustc.edu.cn"
  ],
  "data-root": "/home/docker-root-dir"
}

复制原来的镜像数据

cp -a /var/lib/docker/ /home/doker-root-dir/

一定要加-a 这样新的目录下的文件权限等信息和原有的保持一样。不然容器可能会不能起来。 出现一下一些问题：

• Docker 修改Data目录后MySQL启动失败的问题 – 工作生活心情记忆 (firegod.cn)
• Docker更改默认存储路径后mysql容器启动不起来报mysqld:Can‘t create/write to file ‘/tmp/ib8cWqRv‘ (Errcode :13 - Permis)_dockers 更换overlay地址后,mysql 启动不了-CSDN博客

启动docker，检查docker info

systemctl start docker
docker info
docker run hello-world