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

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

接下来，我尝试提取第一个图像：

docker pull centos

但是发生了此错误：

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

如果我尝试此操作而未更改位置-好的，没问题。

如何解决？