1. 首先使用Docker info查看docker的基本信息

bash4-.3 ~# docker info
Containers: 0
Images: 0
Storage Driver: devicemapperPool Name: docker-8:1-787286-poolPool Blocksize: 65.54 kBBacking Filesystem: extfsData file: /dev/loop0Metadata file: /dev/loop1Data Space Used: 305.7 MBData Space Total: 107.4 GBData Space Available: 50.3 GBMetadata Space Used: 733.2 kBMetadata Space Total: 2.147 GBMetadata Space Available: 2.147 GBUdev Sync Supported: trueDeferred Removal Enabled: falseData loop file: /var/lib/docker/devicemapper/devicemapper/dataMetadata loop file: /var/lib/docker/devicemapper/devicemapper/metadataLibrary Version: 1.02.89-RHEL6 (2014-09-01)
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 2.6.32-504.el6.x86_64
Operating System: <unknown>
CPUs: 4
Total Memory: 19.22 GiB
Name: vps46.timecash.cn
ID: LGNH:GIPP:LUP5:YYDC:VKVC:PPUW:MMGR:JA4V:VFV4:7L7L:E23U:PULA

可以看到docker文件存储路径为: /var/lib/docker/....作为默认存储位置

2. 修改docker默认存储位置

2.1 查看宿主机磁盘容量

bash-4.3 ~# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1        50G  2.3G   45G   5% /
tmpfs           9.7G   80K  9.7G   1% /dev/shm
/dev/sda3       858G   95M  815G   1% /data

2.2 由于磁盘根分区容量不足, 将docker存储路径修改为/data目录

bash-4.3 ~# /etc/init.d/docker stop         -> 停止Docker容器

2.3 备份默认的docker存储路径复制到/data目录下, 并创建软链

bash-4.3 ~# cd /var/lib/
bash-4.3 lib# mv docker docker_160725
bash-4.3 lib# mkdir -p /data/docker/var
bash-4.3 lib# cp -r docker_160725 /data/docker/var/docker
bash-4.3 lib# ln -s /data/docker/var/docker .
bash-4.3 lib# /etc/init.d/docker start
bash-4.3 lib# docker info
Containers: 0
Images: 0
Storage Driver: devicemapperPool Name: docker-8:3-46924001-poolPool Blocksize: 65.54 kBBacking Filesystem: extfsData file: /dev/loop0Metadata file: /dev/loop1Data Space Used: 305.7 MBData Space Total: 107.4 GBData Space Available: 107.1 GBMetadata Space Used: 733.2 kBMetadata Space Total: 2.147 GBMetadata Space Available: 2.147 GBUdev Sync Supported: trueDeferred Removal Enabled: falseData loop file: /data/docker/var/docker/devicemapper/devicemapper/dataMetadata loop file: /data/docker/var/docker/devicemapper/devicemapper/metadataLibrary Version: 1.02.89-RHEL6 (2014-09-01)
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 2.6.32-504.el6.x86_64
Operating System: <unknown>
CPUs: 4
Total Memory: 19.22 GiB
Name: vps46.timecash.cn
ID: LGNH:GIPP:LUP5:YYDC:VKVC:PPUW:MMGR:JA4V:VFV4:7L7L:E23U:PULA
bash-4.3 lib#
bash-4.3 lib#
bash-4.3 lib#