docker 磁盘问题：device or resource busy

问题：[[email protected] ~]# docker start 01ea65845e45
Error response from daemon: Cannot start container 01ea65845e45: Error getting container 01ea65845e4547be24bc3db0bc3b424faf52b8a0534eb525aa829dd9fd6081c2 from driver devicemapper: Error mounting ‘/dev/mapper/docker-8:4-100794844-01ea65845e4547be24bc3db0bc3b424faf52b8a0534eb525aa829dd9fd6081c2‘ on ‘/var/lib/docker/devicemapper/mnt/01ea65845e4547be24bc3db0bc3b424faf52b8a0534eb525aa829dd9fd6081c2‘: device or resource busy
Error: failed to start containers: [01ea65845e45]

上面的问题告诉我们docker容器挂载的磁盘忙

相同的问题经验解决：

umount /dev/cdrom /mnt ，也出现过 device or resource busy

解决方案就是卸载挂载目录：umount /dev/cdrom 或者 umount /mnt

同理，只需要将容器的挂载目录卸掉就行，我这么做了，也成功了。我想应该就是这个问题。

[[email protected] ~]# umount /var/lib/docker/devicemapper/mnt/01ea65845e4547be24bc3db0bc3b424faf52b8a0534eb525aa829dd9fd6081c2

[[email protected] ~]# docker start 01ea65845e45
01ea65845e45
[[email protected] ~]# docker ps -a

CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS                      PORTS                                                                    NAMES

01ea65845e45        neo4j               "/docker-entrypoint.   2 weeks ago         Up 4 seconds                0.0.0.0:7272->7473/tcp, 0.0.0.0:7575->7474/tcp, 0.0.0.0:7171->7687/tcp   romantic_ptolemy

重新启动之后的容器成功了。