Docker daemon 無法啟動: does not match with stored UUID錯誤
最近做項目，遇到Docker daemon 無法啟動: does not match with stored UUID錯誤的問題，經過上網查找資料解決了問題，這里記錄下解決辦法。
Docker 默認使用loop設備存儲鏡像。使用/var/lib/docker存儲。但是當根分區不夠大的時候（Centos7默認安裝只有50G），那就麻煩了。
這里提供下修改方法(以centos7操作系統為例)：
1. systemctl stop docker
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. systemctl start docker
如果執行第六步驟的時候報錯：
Nov 03 15:35:47 master-57 dockerd[11586]: time="2016-11-03T15:35:47.950627346+08:00" level=error msg="[graphdriver] prior storage driver /"devicemapper/" failed: devmapper: Base Device UUID and Filesystem verification failed: devmapper:Current Base Device UUID:15b94e74-7712-44bc-b695-9c2c633b8b3a does not match with stored UUID:cba4570c-421a-4612-8030-e7734d6365c7. Possibly using a different thin pool than last invocation"Nov 03 15:35:47 master-57 dockerd[11586]: time="2016-11-03T15:35:47.950782770+08:00" level=fatal msg="Error starting daemon: error initializing graphdriver: devmapper: Base Device UUID and Filesystem verification failed: devmapper: Current Base Device UUID:15b94e74-7712-44bc-b695-9c2c633b8b3a does not match with stored UUID:cba4570c-421a-4612-8030-e7734d6365c7. Possibly using a different thin pool than last invocation"
那么按照下列方法修改：
stored UUID 存儲在 /var/lib/docker/devicemapper/metadata/deviceset-metadata 里面。 替換成Current Base Device UUID即可。
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