Does CasaOS has a way to mount local folders on containers? if that's so, the only thing you should do is first, stop Overseerr, then install Seerr, point Seerr's config folder to the same local folder as Overseerr, and run it. Seerr will migrate the configuration and everything will be as if you haven't installed anything new, Seerr looks and behaves exactly as Overseerr. Then you can delete your Overseerr installation, but make sure that process doesn't delete any local configuration.
this post was submitted on 23 Feb 2026
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Here is a migration guide from the devs: https://docs.seerr.dev/migration-guide
How did you install Overseerr in CasaOS?
If I understand it, Docker users just need to update the compose file and the settings should migrate. But I haven't done this yet and I'll definitely be backing up first.
CasaOS is like a frontend for Docker, it has an "app store" where it's just a handful of clicks to install something.
Anyway, I did see that guide but the steps for Docker just say "Refer to Seerr Docker Documentation" which is well, kind of complicated.
I do have Portainer and know my way around it's basics if it makes it easier.
It's more than that, you have to make sure a certain directory is owned by the "node" user and it has to have uid 1000. That's a small but very important step in said migration guide, which I overlooked initially. Nothing happened though, container wouldn't start and its logs kept pointing to this directory, then I saw it in the docs.
Change your compose file image to the new one? That is what I did.
***
services:
seerr:
image: ghcr.io/seerr-team/seerr:latest
CasaOS doesn't have a way to do that, how can I do that in Portainer?