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

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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

Solved by JorgeB

  • Author

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 by Mattaton

  • Author

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!

  • Author

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!

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