Docker dm_task_run 失败错误

Question

今天我第一次在 Fedora 21 上安装了 docker。现在，我需要更改 docker images 文件夹的位置，从默认的/var/lib/docker。

复制文件(devicemapper 子文件夹跳过，docker 服务停止)并更改/etc/sysconfig/docker(添加 -g 选项)后，我再次运行 docker 服务，没有问题，已创建 devicemapper/元数据。

接下来，我正在尝试提取第一张图片:

docker pull centos

但是发生了这个错误:

docker pull centos
latest: Pulling from docker.io/centos

6941bfcbbfca: Download complete 
6941bfcbbfca: Error downloading dependent layers 
41459f052977: Downloading [==========================>                        ] 41.61 MB/77.28 MB
fd44297e2ddb: Error pulling image (latest) from docker.io/centos, endpoint: https://registry-1.docker.io/v1/, Driver devicemapper failed to create image rootfs 6941bfcbbfca7f4f48becd38f2639157042bfd44297e2ddb: Error pulling image (latest) from docker.io/centos, Driver devicemapper failed to create image rootfs 6941bfcbbfca7f4f48becd38f2639157042b5cf9ab8c080f1d8b6d047380ecfc: Error running DeviceCreate (createSnapDevice) dm_task_run failed 
FATA[0013] Error pulling image (latest) from docker.io/centos, Driver devicemapper failed to create image rootfs 6941bfcbbfca7f4f48becd38f2639157042b5cf9ab8c080f1d8b6d047380ecfc: Error running DeviceCreate (createSnapDevice) dm_task_run failed 

如果我在不改变位置的情况下尝试这个 - 好的，没问题。

如何解决？

Answer 1

1) service docker stop

2) thin_check/home/docker/devicemapper/devicemapper/metadata

3) thin_check --clear-needs-check-flag/home/docker/devicemapper/devicemapper/metadata

4) service docker start