Docker containers are losing config after server restart

In your container configurations what Restart Policy are you using?

I have the same issue, due to the file system taking longer to mount then docker starting on startup. I'm trying to find the correct way to delay the docker startup to give the filesystem chance to load first.

I can confirm that. My BTRFS RAID sometimes seems not yet ready when Nextcloud and Plex started. I am using a simple Startup Script that restarts the affected containers after 30 seconds. (Execution setup via OMV -> Scheduled Jobs)

#!/bin/bash

# Wait for startup
sleep 30

# After NAS reboot, plex and nextcloud have problems accessing data dirs. Workaround delayed container restart
docker restart nextcloud
docker restart plex

echo "Startup script executed!"

Quote from KM0201

Typically when this happens, its because the docker service is starting before the drive with your config (or data) is mounted... so basically docker detects this as nothing being there. Very common issue when people have their config files on a merged filesystem.

Not sure why your backup drive would cause this. Putting them on another drive (or a drive that isn't external) can fix this. An easy way to verify this is your problem, simply hook your external up, boot the server, and assuming docker starts "empty", simply SSH your server and run the command

systemctl restart docker

Once docker is completely restarted, you should have full access to your containers. A lot of users have taken to setting up scripts, etc.. that just restarts docker 30sec after a boot (as the poster above did) and that would work as well so long as you're not the type to sit with a stop watch to see how long it takes your server to be up 100%

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is the official fix. As my disks are internal to the Dell server I run connected to the backplane of the T430 but the server just starts faster then what the filesystem does I thought I saw one of the other mods mention a system config file that could be edited to fix it but can't find the thread now.

Quote from macom

Is your docker also corrupt after a reboot? (OMV5, Pi4) This might fix it!

This direct to my post?

Quote from macom

yes, do this:

In the thread I linked ryecoaaron gives the command to edit a systemd service file by creating an override file. And the first post proposes a modification for the delayed start of docker.

So I though this is what you had in mind.

Cheers will have a look and give it a try.