Tag: solved

unRAID Docker image corrupted solution

Warning: This method worked for me and I used this source for it. Proceed at your own risk. Also I need to note that I do not use Cache in any form.

The problem:
You have rebooted your unRAID server and your docker service is refusing to start. What you may see is the following:

and

Apr 2 02:25:30 Tower emhttpd: shcmd (264): /etc/rc.d/rc.docker start
Apr 2 02:25:30 Tower root: starting dockerd ...
Apr 2 02:25:36 Tower kernel: BTRFS error (device loop2): parent transid verify failed on 23757324288 wanted 2572174 found 2572201
Apr 2 02:25:36 Tower kernel: BTRFS error (device loop2): parent transid verify failed on 23757324288 wanted 2572174 found 2572201
Apr 2 02:25:46 Tower kernel: BTRFS error (device loop2): parent transid verify failed on 23729225728 wanted 2572162 found 2572190
Apr 2 02:25:46 Tower kernel: BTRFS error (device loop2): parent transid verify failed on 23729225728 wanted 2572162 found 2572190
Apr 2 02:25:46 Tower kernel: BTRFS: error (device loop2) in __btrfs_free_extent:6805: errno=-5 IO failure
Apr 2 02:25:46 Tower kernel: BTRFS info (device loop2): forced readonly
Apr 2 02:25:46 Tower kernel: BTRFS: error (device loop2) in btrfs_run_delayed_refs:2935: errno=-5 IO failure
Apr 2 02:25:46 Tower kernel: BTRFS warning (device loop2): btrfs_uuid_scan_kthread failed -30
Apr 2 02:25:51 Tower emhttpd: shcmd (266): umount /var/lib/docker
Apr 2 02:25:51 Tower root: umount: /var/lib/docker: target is busy.

This of course, made me extremely nervous. Luckily this only meant that my docker file got corrupted. It happened most likely while I was moving it while the docker service was still active. Yeah, it happens.

Solution:
It’s fairly simple, but it takes a little bit of time.

  1. Go to Settings -> Docker -> Enable Docker, and set to No, then click the Apply button (this disables Docker support)
  2. Go to the location of your docker image and rename the file to docker.img.bak – The file may be in 
    /mnt/user/system/docker

    I’m asking you to make a backup, because in all cases, safety first. “Why didn’t you have a backup in the first place?”, I hear you say. Yeah yeah, we all make mistakes every so often! D:

  3. Go to Settings -> Docker -> Enable Docker, and set to Yes and this creates a fresh and empty Docker image. The docker service should now be started. You can see this as this on the docker settings page:

    and on the dashboard you should now see an empty docker field.

  4. Now go to the Apps Tab, Previous Apps Section. Then check off all of your previous applications and hit “Install”

I recommend to do it one by one so you can double-check the settings and clean up the unused templates after you’re done. If you want to make a copy of the templates, FTP into your server and go to

/boot/config/plugins/dockerMan

After you have restored your docker apps, you’re done. Check all the things and make a backup 😉

 

 

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