Storage limits per-app

[atridad]

Is this something that is possible? The use case here is providing testing environments to clients for apps that allow user generated content. This can be useful to make sure a single app does not fill a drive.

[robi]

Sounds like tying it into a quota system.

[atridad]

@robi Precisely. I could see it in the same resources section. Default could be dynamic (unrestricted) and a user could set it to a discrete value.

[murgero]

@atrilahiji Interesting request and interesting use case - I think it's a neat idea but only for certain apps (mail, lamp, surfer, nextcloud (especially!), and social networks like Mastodon and pixelfed)

Not sure how the implementation would be though

[jdaviescoates]

@murgero @atrilahiji one way I guess this could be done right now would be create an external volume (e.g. a Hetzner Cloud Volume) and use that as the data folder for the app you don't want filling up the primary disk. You can also check the usage of this disk volume in System info.

[atridad]

@murgero Exactly, I was thinking for stuff like Nextcloud or Moodle specifically.

[girish]

If anyone knows how this can be done on linux, I am open to investigating this. As in how does mount a storage directory into a docker container that has a specific size? I can only think of some (sparse) file based loopback filesystem. I don't like that approach and would prefer some other alternative. I haven't looked into recent developments in linux quota system.

[msbt]

@girish what about https://docs.docker.com/engine/reference/commandline/run/#set-storage-driver-options-per-container (from https://stackoverflow.com/questions/38542426/docker-container-specific-disk-quota)

[robi]

If storage for Apps was integrated with container attached storage from MayaData.com, this would be an easier option.

This will also help Apps be more distributed and clustered, among other benefits.

[MooCloud_Matt]

@girish
it can be done with LVM, btrfs or ZFS.
And their relative Docker driver, can be an option with an installation on ubuntu + one of those FS.

[MooCloud_Matt]

@robi said in Storage limits per-app:

MayaData.com

I think they use OpenEBS, and as all the distributed storage solutions are complicated to set up, we use Ceph and need a dedicated port on the cluster server for the sync job, not as a requirement but as a need for reasonable performance to be able to use there features.

[girish]

@msbt Interesting link, thanks. I wonder if it works for volumes also. It says it depends on the "volume plugin". Have to investigate. On Cloudron, the data directory is just a normal volume and doesn't use any plugin and it's unclear if that standard thing supports storage-opt.

[robi]

@moocloud_matt said in Storage limits per-app:

OpenEBS

Yes, but there is a more advanced version at MayaData.

@staff and I have spoken with them before.