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Script (for watchtower?) removing all but the last old docker image (lemmy.giftedmc.com)

submitted 11 months ago by haui_lemmy@lemmy.giftedmc.com to c/selfhosted@lemmy.world

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I have watchtower to keep my 50 production docker containers up to date. So far I have never had to resort to an old image since the new one was bugged but I know of the risks and dont have the --cleanup flag activated so I could easily spin up the old image if necessary. I also keep daily (mirrored) backups so I should be ok in the case of failure.

But I keep running into space issues due to multiple GBs of old images that I have to manually remove to not fill up the rather small ssd.

Does anyone have an idea how to automatically remove all but the newest unused docker image so I can quickly revert to it in case of failure but once there is another unused one of this container it goes away?

It's probably no big deal but searching for it together with watchtower didnt yield anything so far.

Thanks in advance and have a good one.

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[–] tristan@aussie.zone 4 points 11 months ago (1 children)

Not exactly what you're asking but you can push specific images to a private repo to keep specific versions... Then you can just use the cleanup tag or prune to clear them off the system and if you want to pull them again it won't need to download it from the internet

[–] haui_lemmy@lemmy.giftedmc.com 1 points 11 months ago

Hmmmm… thats pretty cool. Thanks for the suggestion.