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mrmanager

Lemmy.today had its first unexpected downtime today (self.announcements)

submitted 1 year ago by mrmanager to c/announcements

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Hi all,

The disk on the instance ran out of space today, due to the way Lemmy software caches images from all other instances. That cache had filled up about 60 GB's of disk, despite us being a small instance with very little local activity.

I had to delete the last 10 days of cached images again, and I plan to delete quite a lot of older cached images as well. The mobile apps seems to not be affected by this (they have a local image cache I believe), but on the web site, this leads to missing thumbnail images.

They are working on a fix for this in the Lemmy software so the disks dont fill up so enormously with cached thumbnails, and as soon as its out, we will install it here.

Hope you guys didnt get too annoyed or sad by the instance being unavailable for a while.

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[–] Buelldozer 1 points 1 year ago* (last edited 1 year ago) (2 children)

Thanks for fixing, I was wondering WTF was going on because this instance hasn't had any unexpected downtime since I joined!

I don't know much about how Lemmy works under the hood, I really need to spend some time looking at it, but isn't it possible to set a cron job to check the available free disk and then do a cache purge of the oldest X days of cached images if needed?

Edit: Since I asked the question I took 90 seconds to look and it appears that it possible to make pictrs do this.

[–] mrmanager 4 points 1 year ago

Yeah it was the first downtime we have had since we started! :)

I think it's an excellent idea to make it purge the oldest X days of cached images. I will look at your link and see what I can do. Thank you!

[–] mrmanager 2 points 1 year ago (2 children)

I have been reading up on pict-rs and it seems that the environment variable PICTRS__MEDIA__RETENTION__PROXY is the one to set for cleaning up old cached images.

It seems they added this environment variable in pict-rs version 0.4.2 so I bumped our pict-rs version from 0.4.0 to 0.4.2 and applied the environment variable now.

Hopefully this will take care of the disk space growing on its own, but will keep an eye on it. :)

[–] Buelldozer 2 points 1 year ago (1 children)

I found a problem. It removes Avatar & Banner pictures from your profile!

[–] mrmanager 2 points 1 year ago

I noticed this also. Since all pictures are handled by pict rs, deleting anything from disk risks removing any picture users have uploaded also.

Interesting design choice of Lemmy to keep both cached images and user images in the same place with the same names... They all look the same on disk with generated names.

I noticed today that community pics are gone also.

Try to upload the same images again and if that doesn't work, try to create new images to replace them. I will also try tomorrow to look into this more...

[–] Buelldozer 2 points 1 year ago

Awesome! Hopefully it works!