更改docker默认数据目录的方法步骤

[root@hxy ~]# docker version
client: docker engine - community
 version:           27.2.1
 api version:       1.47
 go version:        go1.22.7
 git commit:        9e34c9b
 built:             fri sep  6 12:09:42 2024
 os/arch:           linux/amd64
 context:           default

server: docker engine - community
 engine:
  version:          27.2.1
  api version:      1.47 (minimum version 1.24)
  go version:       go1.22.7
  git commit:       8b539b8
  built:            fri sep  6 12:07:57 2024
  os/arch:          linux/amd64
  experimental:     false
 containerd:
  version:          1.7.21
  gitcommit:        472731909fa34bd7bc9c087e4c27943f9835f111
 runc:
  version:          1.1.13
  gitcommit:        v1.1.13-0-g58aa920
 docker-init:
  version:          0.19.0
  gitcommit:        de40ad0
[root@hxy ~]# systemctl stop docker
warning: stopping docker.service, but it can still be activated by:
  docker.socket

[root@hxy ~]# mount /dev/sr0 /mnt
mount: /mnt: warning: source write-protected, mounted read-only.
[root@hxy ~]# yum -y install rsync
正在更新 subscription management 软件仓库。
无法读取客户身份

本系统尚未在权利服务器中注册。可使用 subscription-manager 进行注册。

上次元数据过期检查：0:04:09 前，执行于 2024年11月18日 星期一 14时38分34秒。
软件包 rsync-3.2.3-19.el9.x86_64 已安装。
依赖关系解决。
无需任何处理。
完毕！
[root@hxy ~]# 

[root@hxy ~]# umount /mnt（取消挂载）
[root@hxy ~]# mkdir -p /mnt/docker-data（创建新数据目录）
[root@hxy ~]# rsync -ap /var/lib/docker/ /mnt/docker-data/（备份数据）
sending incremental file list
./
buildkit/cache.db
         32,768 100%    0.00kb/s    0:00:00 (xfr#1, ir-chk=1103/1116)
containers/0847c6969330b0e88bc78c4120221954dd6f321c334be357be83c23b673ec29c/
containers/0847c6969330b0e88bc78c4120221954dd6f321c334be357be83c23b673ec29c/config.v2.json
          2,401 100%    2.29mb/s    0:00:00 (xfr#2, ir-chk=1081/1116)
containers/0847c6969330b0e88bc78c4120221954dd6f321c334be357be83c23b673ec29c/hostconfig.json
          1,461 100%  713.38kb/s    0:00:00 (xfr#3, ir-chk=1080/1116)
containers/0899aa482296158404fe7e475b8ca64f571ef05fccaedb5279ce34cb2a1aa598/
containers/0899aa482296158404fe7e475b8ca64f571ef05fccaedb5279ce34cb2a1aa598/config.v2.json
          2,393 100%    1.14mb/s    0:00:00 (xfr#4, ir-chk=1072/1116)
containers/0899aa482296158404fe7e475b8ca64f571ef05fccaedb5279ce34cb2a1aa598/hostconfig.json
          1,461 100%  475.59kb/s    0:00:00 (xfr#5, ir-chk=1071/1116)
containers/217d978e1a191d798efdad2058b28a1cd21f938e0335c04038472b285c42e3ab/
containers/217d978e1a191d798efdad2058b28a1cd21f938e0335c04038472b285c42e3ab/config.v2.json
          2,396 100%  584.96kb/s    0:00:00 (xfr#6, ir-chk=1063/1116)
containers/217d978e1a191d798efdad2058b28a1cd21f938e0335c04038472b285c42e3ab/hostconfig.json
          1,461 100%  285.35kb/s    0:00:00 (xfr#7, ir-chk=1062/1116)
overlay2/
runtimes/
tmp/
volumes/
volumes/metadata.db
         32,768 100%    0.00kb/s    0:00:00 (xfr#29, to-chk=0/26382)

[root@hxy ~]# vi /etc/docker/daemon.json（删除原加速器内容）
[root@hxy ~]# cat /etc/docker/daemon.json（查看输入内容）

{
  "data-root": "/mnt/docker-data"
}

[root@hxy ~]# systemctl start docker（开启docker）
[root@hxy ~]# systemctl status docker（查看当前状态）
● docker.service - docker application container engine
     loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; prese>
     active: active (running) since mon 2024-11-18 14:49:31 cst; 20s ago
triggeredby: ● docker.socket
       docs: https://docs.docker.com
   main pid: 61352 (dockerd)
      tasks: 17
     memory: 53.2m
        cpu: 1.016s
     cgroup: /system.slice/docker.service
             └─61352 /usr/bin/dockerd -h fd:// --containerd=/run/containerd>

11月 18 14:49:30 hxy dockerd[61352]: time="2024-11-18t14:49:30.772302169+08>
11月 18 14:49:31 hxy dockerd[61352]: time="2024-11-18t14:49:31.391786710+08>
11月 18 14:49:31 hxy dockerd[61352]: time="2024-11-18t14:49:31.565001457+08>
11月 18 14:49:31 hxy dockerd[61352]: time="2024-11-18t14:49:31.565120362+08>
11月 18 14:49:31 hxy dockerd[61352]: time="2024-11-18t14:49:31.565160031+08>
11月 18 14:49:31 hxy dockerd[61352]: time="2024-11-18t14:49:31.565929847+08>
11月 18 14:49:31 hxy dockerd[61352]: time="2024-11-18t14:49:31.604773790+08>
11月 18 14:49:31 hxy dockerd[61352]: time="2024-11-18t14:49:31.604909987+08>
11月 18 14:49:31 hxy dockerd[61352]: time="2024-11-18t14:49:31.693026651+08>
11月 18 14:49:31 hxy systemd[1]: started docker application container engin>
lines 1-22/22 (end)
[root@hxy ~]# 

[root@hxy ~]# docker info
client: docker engine - community
 version:    27.2.1
 context:    default
 debug mode: false
 plugins:
  buildx: docker buildx (docker inc.)
    version:  v0.16.2
    path:     /usr/libexec/docker/cli-plugins/docker-buildx
  compose: docker compose (docker inc.)
    version:  v2.29.2
    path:     /usr/libexec/docker/cli-plugins/docker-compose

server:
 containers: 13
  running: 0
  paused: 0
  stopped: 13
 images: 2
 server version: 27.2.1
 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: systemd
 cgroup version: 2
 plugins:
  volume: local
  network: bridge host ipvlan macvlan null overlay
  log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 swarm: inactive
 runtimes: io.containerd.runc.v2 runc
 default runtime: runc
 init binary: docker-init
 containerd version: 472731909fa34bd7bc9c087e4c27943f9835f111
 runc version: v1.1.13-0-g58aa920
 init version: de40ad0
 security options:
  seccomp
   profile: builtin
  cgroupns
 kernel version: 5.14.0-362.8.1.el9_3.x86_64
 operating system: red hat enterprise linux 9.3 (plow)
 ostype: linux
 architecture: x86_64
 cpus: 4
 total memory: 1.879gib
 name: hxy
 id: 5bfc3e44-6003-449e-bb96-93c320d6f2f2
 docker root dir: /mnt/docker-data（默认目录更改成功）
 debug mode: false
 experimental: false
 insecure registries:
  127.0.0.0/8
 live restore enabled: false