yum -y install epel-release
yum -y install docker
docker version

docker版本信息：

Client:
 Version:         1.13.1
 API version:     1.26
 Package version: docker-1.13.1-94.gitb2f74b2.el7.centos.x86_64
 Go version:      go1.10.3
 Git commit:      b2f74b2/1.13.1
 Built:           Tue Mar 12 10:27:24 2019
 OS/Arch:         linux/amd64

Server:
 Version:         1.13.1
 API version:     1.26 (minimum version 1.12)
 Package version: docker-1.13.1-94.gitb2f74b2.el7.centos.x86_64
 Go version:      go1.10.3
 Git commit:      b2f74b2/1.13.1
 Built:           Tue Mar 12 10:27:24 2019
 OS/Arch:         linux/amd64
 Experimental:    false

查看docker信息：

docker info

输出如下：

Containers: 1
 Running: 0
 Paused: 0
 Stopped: 1
Images: 1
Server Version: 1.13.1
Storage Driver: overlay2
 Backing Filesystem: xfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: journald
Cgroup Driver: systemd
Plugins: 
 Volume: local
 Network: bridge host macvlan null overlay
Swarm: inactive
Runtimes: docker-runc runc
Default Runtime: docker-runc
Init Binary: /usr/libexec/docker/docker-init-current
containerd version:  (expected: aa8187dbd3b7ad67d8e5e3a15115d3eef43a7ed1)
runc version: df5c38a9167e87f53a9894d77c0950e178a745e7 (expected: 9df8b306d01f59d3a8029be411de015b7304dd8f)
init version: fec3683b971d9c3ef73f284f176672c44b448662 (expected: 949e6facb77383876aeff8a6944dde66b3089574)
Security Options:
 seccomp
  WARNING: You're not using the default seccomp profile
  Profile: /etc/docker/seccomp.json
Kernel Version: 3.10.0-862.14.4.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
Number of Docker Hooks: 3
CPUs: 1
Total Memory: 991.7 MiB
Name: fuqiang
ID: F2MD:SKQC:HSZG:LN7H:L3KI:7SN2:JHRP:HMQI:3KK2:4RTO:TPTJ:UCYZ
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Experimental: false
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false
Registries: docker.io (secure)

上面的输出信息中，Docker Root Dir: /var/lib/docker，就是镜像与容器实例的默认存储位置；

容器镜像目标位置：/home/

停止docker服务：

systemctl stop docker

数据迁移：

cp -a /var/lib/docker/ /home/

数据备份：

mv /var/lib/docker /var/lib/docker.bak

Docker Server Version: 1.13.1通过修改/etc/docker/daemon.json文件中的参数变更镜像与容器实例的默认存储位置；

cd /etc/docker/
yum -y install vim

/etc/docker/daemon.json原文件：

{}

/etc/docker/daemon.json文件修改后：

{
    "graph":"/home/docker"
}

启动docker服务：

systemctl start docker
systemctl status docker

查看docker info信息：

docker  info 

输入如下：

Containers: 0
 Running: 0
 Paused: 0
 Stopped: 0
Images: 0
Server Version: 1.13.1
Storage Driver: overlay2
 Backing Filesystem: xfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: journald
Cgroup Driver: systemd
Plugins: 
 Volume: local
 Network: bridge host macvlan null overlay
Swarm: inactive
Runtimes: docker-runc runc
Default Runtime: docker-runc
Init Binary: /usr/libexec/docker/docker-init-current
containerd version:  (expected: aa8187dbd3b7ad67d8e5e3a15115d3eef43a7ed1)
runc version: df5c38a9167e87f53a9894d77c0950e178a745e7 (expected: 9df8b306d01f59d3a8029be411de015b7304dd8f)
init version: fec3683b971d9c3ef73f284f176672c44b448662 (expected: 949e6facb77383876aeff8a6944dde66b3089574)
Security Options:
 seccomp
  WARNING: You're not using the default seccomp profile
  Profile: /etc/docker/seccomp.json
 selinux
Kernel Version: 3.10.0-862.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
Number of Docker Hooks: 3
CPUs: 4
Total Memory: 7.455 GiB
Name: localhost.localdomain
ID: 4VKW:3EPS:SZHT:UAXV:AGNO:TWFN:CG6U:UM3I:YYJK:NS7A:INDK:2Q3C
Docker Root Dir: /home/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Experimental: false
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false
Registries: docker.io (secure)

通过如上输入，我们发现：

Docker Root Dir: /home/docker

说明容器镜像与实例默认的存储位置已经变更了。