下述过程都是在cenots 7.2上进行。

默认安装完成docker后 docker 的所有images及相关信息存储位置为：/var/lib/docker

而通常我们系统盘挂载盘一般不会很大，所以需要将其移到其他分区，我们可以采用软连接的方式来完成，示例，下面我们将其移到/home/dockerfile 目录下，具体方法如下：

首先暂停docker 服务
[root@localhost docker]# service docker stop
将文件移到指定目录：
[root@localhost docker]# cd /var/lib/
[root@localhost lib]# mv docker/* /home/dockerfile
[root@localhost dockerfile]# ln -s /home/dockerfile/ /var/lib/docker
查看一下，当前/var/lib/docker

[root@localhost lib]# ls -la docker
lrwxrwxrwx. 1 root root 17 Mar 7 21:28 docker -> /home/dockerfile/

OK，启动服务
[root@localhost lib]# service docker start
输入命令查看是否成功

[root@localhost lib]# docker info

[root@localhost lib]# docker info
Containers: 1
 Running: 1
 Paused: 0
 Stopped: 0
Images: 7
Server Version: 1.10.2
Storage Driver: devicemapper
 Pool Name: docker-253:2-4563448077-pool
 Pool Blocksize: 65.54 kB
 Base Device Size: 10.74 GB
 Backing Filesystem: xfs
 Data file: /dev/loop0
 Metadata file: /dev/loop1
 Data Space Used: 1.265 GB
 Data Space Total: 107.4 GB
 Data Space Available: 106.1 GB
 Metadata Space Used: 2.605 MB
 Metadata Space Total: 2.147 GB
 Metadata Space Available: 2.145 GB
 Udev Sync Supported: true
 Deferred Removal Enabled: false
 Deferred Deletion Enabled: false
 Deferred Deleted Device Count: 0
 Data loop file: /home/dockerfile/devicemapper/devicemapper/data
 WARNING: Usage of loopback devices is strongly discouraged for production use. Either use `--storage-opt dm.thinpooldev` or use `--storage-opt dm.no_warn_on_loop_devices=true` to suppress this warning.
 Metadata loop file: /home/dockerfile/devicemapper/devicemapper/metadata
 Library Version: 1.02.107-RHEL7 (2015-12-01)
Execution Driver: native-0.2
Logging Driver: json-file
Plugins: 
 Volume: local
 Network: null host bridge
Kernel Version: 3.10.0-327.4.4.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 8
Total Memory: 15.35 GiB
Name: localhost.localdomain
ID: UQP2:Z5KF:4DGT:3JRA:QUJU:V554:VUZD:PH2K:AD4C:57X3:TLA4:M6VH
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled
[root@localhost lib]#