修改Docker数据目录位置，包含镜像位置

# 展示当前Docker的配置信息
docker info
# 在信息中找到Docker Root Dir，对应的就是数据目录，默认为：
# Docker Root Dir: /var/lib/docker

sudo vim /etc/systemd/system/multi-user.target.wants/docker.service
# 找到ExecStart部分，在此行末尾添加--graph=你的目录，我的如下
[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --graph=/home/hellxz/docker-home
# 保存退出，接着让systemd重新读取这些service等的配置
sudo systemctl daemon-reload
# 重启Docker服务
sudo systemctl restart docker

{
  "registry-mirrors": ["http://hub-mirror.c.163.com"],
  "data-root": "/home/docker"
}

sudo systemctl restart docker

[root@HNGC-SVR-QCCBigDataSvr-Dev2 docker]# docker info
Client:
 Debug Mode: false
<p>Server:
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 0
Server Version: 19.03.13
Storage Driver: overlay2
Backing Filesystem: xfs
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
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: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 8fba4e9a7d01810a393d5d25a3621dc101981175
runc version: dc9208a3303feef5b3839f4323d9beb36df0a9dd
init version: fec3683
Security Options:
seccomp
Profile: default
Kernel Version: 3.10.0-693.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 31.26GiB
Name: HNGC-SVR-QCCBigDataSvr-Dev2
ID: 6QOM:GCGS:F7NS:KOH4:SHLI:6RWQ:EHSA:YGMY:LG24:LS6S:MAVN:54HY
Docker Root Dir: /home/docker
Debug Mode: false
Registry: <a href="https://www.php.cn/link/a2a5e1dc29759ed291e5ba5ecf1d6cbd">https://www.php.cn/link/a2a5e1dc29759ed291e5ba5ecf1d6cbd</a>
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Registry Mirrors:
<a href="https://www.php.cn/link/c209163f3e310b6c0a9a2c6489e22a8e">https://www.php.cn/link/c209163f3e310b6c0a9a2c6489e22a8e</a>
Live Restore Enabled: false