@nebulon yeah I tried reinstalling. It could be a resource issue. I'll investigate further.

@nebulon said in Frequent 500s because of permission denied /app/code/tmp/cache:

Oh I see. Since I had access to your instance for fixing the issue anyways, I saw that the app was healthy and running, but the nginx reverse proxy config wasn't correctly updated.
This may actually be a bug in Cloudron. The reason likely is that I've changed the app's internal port from 80 to 8000 to not require apache to run as root.

To fix this quickly, I've just submitted the location form of the app configure, which triggers a recreation of the reverse proxy files.

At least for me the app is now reachable.

This explains a lot.

Thank you for sharing.

There's a lot to unpack there, especially the postgres stuff.
I can see how many users wouldn't know what to do there.

Can you expand on all those 'postgres' parts and what to look for?

The 'manual migration' may not be needed since the app will do that on restart exiting recovery mode.

This is now fixed with the latest OpenProject app package.

The new package with the migration steps included is actually done, however the migration itself is not working as expected. This requires further debugging before releasing.