今天遷移了虛擬機后，虛擬機開機之后，其他都正常，但docker 進程無法啟動
使用的docker 版本為

Docker version 18.09.0, build 4d60db4

啟動方式：

 systemctl start docker

啟動后報錯：

Job for docker.service failed because the control process exited with error code                                                                                                                                                             . See "systemctl status docker.service" and "journalctl -xe" for details.

詳細錯誤如下：

Mar 30 20:03:12 vm-10-124-67-113 dockerd[23876]: Error starting daemon: error initializing graphdriver: /tv/docker contains several valid graphdrivers: devicemapper, overlay2; Please cleanup or explicitly choose storage driver (-s <DRI
Mar 30 20:03:12 vm-10-124-67-113 systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
Mar 30 20:03:12 vm-10-124-67-113 systemd[1]: Failed to start Docker Application Container Engine.

docker-ce 版本默認支持的存儲方式是overlay2,但我看了下

cat /etc/docker/daemon.conf
{
  "storage-driver": "devicemapper",
}

指定了存儲方式是devicemapper，造成了沖突，沖突的原因是/tv/docker下存在overlay2的存儲，因此沖突了

image.png

將此文件目錄改成overlay2.bak后，啟動正常了