Docker守护进程启动失败：UUID与存储的UUID不匹配

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&＃xff08;Centos7默认安装只有50G&＃xff09;&＃xff0c;那就麻烦了。

这里提供下修改方法(以centos7操作系统为例)&＃xff1a;

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

如果执行第六步骤的时候报错&＃xff1a;

Nov 03 15:35:47 master-57 dockerd[11586]: time&＃61;"2016-11-03T15:35:47.950627346&＃43;08:00" level&＃61;error msg&＃61;"[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&＃61;"2016-11-03T15:35:47.950782770&＃43;08:00" level&＃61;fatal msg&＃61;"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&＃xff1a;

stored UUID 存储在 /var/lib/docker/devicemapper/metadata/deviceset-metadata 里面。 替换成Current Base Device UUID即可。