在 centos 7 中 Docker 启动失败答案

【问题标题】：Docker start failed in centos 7在 centos 7 中 Docker 启动失败
【发布时间】：2018-04-22 00:29:29
【问题描述】：

在 Centos 7 上运行的 Docker 服务无法启动，我有一些 docker 镜像，我想不惜一切代价保存。我搜索了几个在线文档，他们都说要删除我不想删除的 /var/lib/docker/ 目录，因为所有图像和容器的东西都在那里。有人可以救我如何在丢失任何数据的情况下让 docker 恢复运行。

日志：

[root@BuyPandGDev01 /]# systemctl status docker.service -l
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Sun 2018-04-22 00:05:23 UTC; 19min ago
     Docs: http://docs.docker.com
  Process: 1539 ExecStart=/usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current --default-runtime=docker-runc --exec-opt native.cgroupdriver=systemd --userland-proxy-path=/usr/libexec/docker/docker-proxy-current $OPTIONS $DOCKER_STORAGE_OPTIONS $DOCKER_NETWORK_OPTIONS $ADD_REGISTRY $BLOCK_REGISTRY $INSECURE_REGISTRY $REGISTRIES (code=exited, status=1/FAILURE)
 Main PID: 1539 (code=exited, status=1/FAILURE)

Apr 22 00:05:22 BuyPandGDev01 systemd[1]: Starting Docker Application Container Engine...
Apr 22 00:05:22 BuyPandGDev01 dockerd-current[1539]: time="2018-04-22T00:05:22.068920976Z" level=info msg="libcontainerd: new containerd process, pid: 1550"
Apr 22 00:05:23 BuyPandGDev01 dockerd-current[1539]: time="2018-04-22T00:05:23.101036303Z" level=warning msg="devmapper: Usage of loopback devices is strongly discouraged for production use. Please use `--storage-opt dm.thinpooldev` or use `man docker` to refer to dm.thinpooldev section."
Apr 22 00:05:23 BuyPandGDev01 dockerd-current[1539]: time="2018-04-22T00:05:23.155223108Z" level=error msg="[graphdriver] prior storage driver \"devicemapper\" failed: devmapper: Base Device UUID and Filesystem verification failed: devicemapper: Error running deviceCreate (ActivateDevice) dm_task_run failed"
Apr 22 00:05:23 BuyPandGDev01 dockerd-current[1539]: time="2018-04-22T00:05:23.155708413Z" level=fatal msg="Error starting daemon: error initializing graphdriver: devmapper: Base Device UUID and Filesystem verification failed: devicemapper: Error running deviceCreate (ActivateDevice) dm_task_run failed"
Apr 22 00:05:23 BuyPandGDev01 systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
Apr 22 00:05:23 BuyPandGDev01 systemd[1]: Failed to start Docker Application Container Engine.
Apr 22 00:05:23 BuyPandGDev01 systemd[1]: Unit docker.service entered failed state.
Apr 22 00:05:23 BuyPandGDev01 systemd[1]: docker.service failed.

journalctl -xe:

[root@BuyPandGDev01 /]# journalctl -xe
-- Unit docker-storage-setup.service has begun starting up.
Apr 22 00:25:58 BuyPandGDev01 container-storage-setup[2111]: INFO: Volume group backing root filesystem could not be determined
Apr 22 00:25:58 BuyPandGDev01 container-storage-setup[2111]: ERROR: No valid volume group found. Exiting.
Apr 22 00:25:58 BuyPandGDev01 systemd[1]: docker-storage-setup.service: main process exited, code=exited, status=1/FAILURE
Apr 22 00:25:58 BuyPandGDev01 systemd[1]: Failed to start Docker Storage Setup.
-- Subject: Unit docker-storage-setup.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit docker-storage-setup.service has failed.
--
-- The result is failed.
Apr 22 00:25:58 BuyPandGDev01 systemd[1]: Unit docker-storage-setup.service entered failed state.
Apr 22 00:25:58 BuyPandGDev01 systemd[1]: docker-storage-setup.service failed.
Apr 22 00:25:58 BuyPandGDev01 systemd[1]: Starting Docker Application Container Engine...
-- Subject: Unit docker.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit docker.service has begun starting up.
Apr 22 00:25:58 BuyPandGDev01 dockerd-current[2140]: time="2018-04-22T00:25:58.731142431Z" level=info msg="libcontainerd: new containe
Apr 22 00:25:59 BuyPandGDev01 dockerd-current[2140]: time="2018-04-22T00:25:59.767061431Z" level=warning msg="devmapper: Usage of loop
Apr 22 00:25:59 BuyPandGDev01 kernel: device-mapper: table: 253:1: thin: Couldn't open thin internal device
Apr 22 00:25:59 BuyPandGDev01 kernel: device-mapper: ioctl: error adding target to table
Apr 22 00:25:59 BuyPandGDev01 dockerd-current[2140]: time="2018-04-22T00:25:59.835261589Z" level=error msg="[graphdriver] prior storag
Apr 22 00:25:59 BuyPandGDev01 dockerd-current[2140]: time="2018-04-22T00:25:59.835697590Z" level=fatal msg="Error starting daemon: err
Apr 22 00:25:59 BuyPandGDev01 systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
Apr 22 00:25:59 BuyPandGDev01 systemd[1]: Failed to start Docker Application Container Engine.
-- Subject: Unit docker.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit docker.service has failed.
--
-- The result is failed.
Apr 22 00:25:59 BuyPandGDev01 systemd[1]: Unit docker.service entered failed state.
Apr 22 00:25:59 BuyPandGDev01 systemd[1]: docker.service failed.
Apr 22 00:25:59 BuyPandGDev01 polkitd[703]: Unregistered Authentication Agent for unix-process:2105:147803 (system bus name :1.43, obj
lines 2751-2788/2788 (END)

任何回复都会有所帮助和赞赏。

谢谢，库马尔

【问题讨论】：

Stack Overflow 是一个编程和开发问题的网站。这个问题似乎离题了，因为它与编程或开发无关。请参阅帮助中心的What topics can I ask about here。也许Super User 或Unix & Linux Stack Exchange 会是一个更好的提问地点。
对于遇到此问题的任何人，在最坏的情况下，您可以rm -rf /var/lib/docker 并重新启动服务器。你可以找到讨论here

标签： linux azure docker centos7

【解决方案1】：

我在升级 docker 时发生了这个错误。对我有用的解决方案是删除旧的 docker 文件 /var/lib/docker/ 并重新启动 docker 服务。这是解决方案。

# Remove docker files
$ rm -rf /var/lib/docker/

# Restart docker via service or via systemctl
$ service docker restart 
$ service docker status

$ systemctl start docker.service
$ systemctl status docker.service

【讨论】：

【解决方案2】：

我在启动 docker 服务时也遇到了这个错误：

kernel: device-mapper: table: 253:1: thin: Couldn't open thin internal device

我通过创建一个从/var/lib/docker 到计算机上另一个具有更多磁盘空间的位置的软链接来修复它。

cd /var/lib/
mv docker docker.old
ln -s /path/to/big/disk/docker/ docker

重启服务：

systemctl restart docker

【讨论】：