https://forum.cloudron.io/topic/3661/unable-to-uninstall is the same for another app (mastodon).

@nebulon there should be branching logic after Cloudron 'senses' that it doesn't own that DNS anymore.

Prompt for delete of an unmanaged resource in that state?

in fact in the directory only the dir data is left and it is empty but root:root is the owner

fe2b1d58-3d79-4c28-bc6d-17bc1821095b-image.png

after rmdir /home/yellowtent/appsdata/f266ef68-b01b-4a9e-954e-b8bc68010672/data
the uninstallation went well 😉

@makemrproper said in Disaster recovery - Restoring a backup:

As far as I can tell, as an operator I need to keep track of what was the UUID of the container I deleted, in order to restore it.

Sorry for much confusion. Let me first try to explain how to import.

Finding the App's ID

Each Cloudron app has a unique ID. This is separate from the internal docker container id and you should never have to use any docker container id related stuff,

Now the question is how to figure out this unique ID of an uninstalled app. One way is to look into the event log. Select the uninstalled apps as the filter:

54e38dd5-5d1e-4cae-b6d7-c8d259faa5c0-image.png

Then when you click on the event, you will see the app id:
fd6568bb-fd53-44d7-8832-612971b9d9dd-image.png

Locating the backup

The backups are stored with the filename timestamp/app_<id>_v<packageversion>.tar.gz (for tgz backups) or timestamp/app_<id>_v<packageversion> (for rsync backups). The package version is needed in the case where you have a old version of an app and you want to restore to that old version.

Install an empty app

We have to next install the app for appstore. For this go to the appstore and install the app.
68df18aa-cba6-42fb-a512-3caba88bc126-image.png

Notice the package version in the URL bar. Above, I am trying to install package v2.0.5 of wordpress. This version must match the version in the backup we located above.

Import app

Finally, go to app -> configure -> import

OK, all that said, what can be improved here. I see that the way to locate an uninstalled app's id is missing from the docs. I can add that part. Is there anything else we can fix on our side? Maybe we can keep the app's fqdn -> uuid listing alongside the backups?

And you can follow this doc to restore an uninstalled app from the backup - https://cloudron.io/documentation/backups/#import-app-backup . You have to make sure the app backup is still around though since it will get cleaned up by the backup retention policy.

The issue here was that docker was stuck and not responding to API calls anymore. The issue is known and it happens at random times (no idea what the root cause is).

The fix is to simply systemctl restart docker and if that command gets stuck to just reboot the server.