Docker daemon 无法启动: does not match with stored UUID错误解决办法
Dockerdaemon无法启动:doesnotmatchwithstoredUUID错误
最近做项目，遇到Dockerdaemon无法启动:doesnotmatchwithstoredUUID错误的问题，经过上网查找资料解决了问题，这里记录下解决办法。
Docker默认使用loop设备存储镜像。使用/var/lib/docker存储。但是当根分区不够大的时候（Centos7默认安装只有50G），那就麻烦了。
这里提供下修改方法(以centos7操作系统为例)：
1. systemctlstopdocker
2. mount /dev/sdb1 /tmp
3. cp-arf/var/lib/docker/* /tmp
4. rm-rf /var/lib/docker
5. umount/tmp; mount/dev/sdb1 /var/lib/docker
6. systemctlstartdocker
如果执行第六步骤的时候报错：
Nov0315:35:47master-57dockerd[11586]:time="2016-11-03T15:35:47.950627346+08:00"level=errormsg="[graphdriver]priorstoragedriver\"devicemapper\"failed:devmapper:BaseDeviceUUIDandFilesystemverificationfailed:devmapper:CurrentBaseDeviceUUID:15b94e74-7712-44bc-b695-9c2c633b8b3adoesnotmatchwithstoredUUID:cba4570c-421a-4612-8030-e7734d6365c7.Possiblyusingadifferentthinpoolthanlastinvocation" Nov0315:35:47master-57dockerd[11586]:time="2016-11-03T15:35:47.950782770+08:00"level=fatalmsg="Errorstartingdaemon:errorinitializinggraphdriver:devmapper:BaseDeviceUUIDandFilesystemverificationfailed:devmapper:CurrentBaseDeviceUUID:15b94e74-7712-44bc-b695-9c2c633b8b3adoesnotmatchwithstoredUUID:cba4570c-421a-4612-8030-e7734d6365c7.Possiblyusingadifferentthinpoolthanlastinvocation"
那么按照下列方法修改：
storedUUID存储在/var/lib/docker/devicemapper/metadata/deviceset-metadata里面。替换成CurrentBaseDeviceUUID即可。
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