Docker will not start - docker.img is in-use, cannot mount

[Mattaton]

I noticed some issues with getting a few of my containers started today and decided to restart the docker service. Now it won't come back up.

 

Logs say:

Quote

Oct  4 08:10:48 TyreeMedia emhttpd: shcmd (372): /usr/local/sbin/mount_image '/mnt/user/system/docker/docker.img' /var/lib/docker 20
Oct  4 08:10:48 TyreeMedia root: '/mnt/user/system/docker/docker.img' is in-use, cannot mount
Oct  4 08:10:48 TyreeMedia emhttpd: shcmd (372): exit status: 1

 

I've attached my diagnostics. Should I just reboot the server?

 

Thanks!

tyreemedia-diagnostics-20231004-0812.zip

[Mattaton]

Attempted to restart array. Has not been able to stop because it can't unmount /mnt/cache since it is busy.

 

UPDATE: After 30 minutes, it still can't unmount the cache.

Edited October 4, 2023 by Mattaton

[JorgeB]

See if this helps to reboot:

https://forums.unraid.net/topic/141479-6122-array-stop-stuck-on-retry-unmounting-disk-shares/?do=findComment&comment=1281063

 

[Mattaton]

I was just coming back to post that I got the array stopped and restarted.

 

I did end up using the 

Quote

umount /dev/loop2

to get the cache unlocked.

 

I'm going to read over the rest of the post you linked to see what else they did.

 

Thanks!

[Mattaton]

For future reference, this post by @ljm42 seems to be the best/confirmed fix for this problem:

Which is an update to his earlier post (which does offer some other CLI commands that could be useful in this scenario):

Thanks!