My Docker somehow is filling up the USB Stick for Unraid.

I now habe 54Gb in /var/lib/docker/btrfs/subvolumes folder , the stick is full and the Webpage tells me after login an Error 500 so i cannot get in the gui.

What can i do now ? What are those files and how can i make the webpage working again ?

ssh is still working for now. so i can access the console.

Unraid Version 7.1.4

Edited July 10, 2025Jul 10 by MikePiko
added unraid version

It sounds as if you misconfigured the docker settings as you should never end up with those files on the flash drive.

Havent changed anything on the Docker settings. Its running for 2 Years now with this settings.

Was able to get some pages of the web ui when i constantly hit reload at the page.

Just realised I did not read your problem correctly.

The files you mention are perfectly normal as they are the container sub-volumes inside the docker.img file that is mounted at /var/lib/docker

You also mentioned your flash drive filling up - what with? It should not be the files you listed.

found the issue. The Dockerfiles in var/lib are not on the stick, its mounted on my nvme. just made a du -h and found those many dirs and assumed it was docker.

The Problem was a Bacula Backup Job wanting to write to /mnt/usbpool, which was a external usb drive for my backups. but the usb cable was buggy and the system froze last weekend.

Bought a new cable and connected it but had forgot to stop the backup job in the meantime.

so it wrote everything to /mnt/usbpool, which was not mounted at the days between failure of the cable and connecting the new one.

Now everything is working again , sorry ;-)