this post was submitted on 10 Nov 2024
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How to maintain a local repository of docker images in case they go offline? (lemmy.world)
submitted 1 month ago* (last edited 1 month ago) by ComradeMiao@lemmy.world to c/selfhosted@lemmy.world
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[–] just_another_person@lemmy.world 28 points 1 month ago (2 children)

Retag and push to a local registry. Lots of options out there for setting one up.

Honestly, you already have the image locally if you've pulled it. You don't really need to run a registry unless you're dead set on it. You can also flatten and export containers for backup if you really want.

[–] thirdBreakfast@lemmy.world 16 points 1 month ago (1 children)

Two good points here OP. Type docker image ls to see all the images you currently have locally - you'll possibly be surprised how many. All the ones tagged <none> are old versions.

If you're already using github, it includes an package repository you could push retagged images to, or for more self-hosty, a local instance of Forgejo would be a good option.

[–] foster@lemmy.fosterhangdaan.com 9 points 1 month ago

I'd also like to add that you can save an image to a local file using docker image save and load them back using docker image load. So, along with the options mentioned above, you have plenty of options to backup images for offline use.

[–] rikudou@lemmings.world 6 points 1 month ago (2 children)

Honestly, you already have the image locally if you've pulled it.

I guess not everyone treats their PC as an ephemeral storage, huh? I don't trust anything that's available only locally to survive.

[–] just_another_person@lemmy.world 6 points 1 month ago

Well the question is about a container disappearing from a public registry, in which case nothing would happen if it's already pulled locally. Figuring where to go from there is the other half of that problem.

[–] GBU_28@lemm.ee 1 points 1 month ago

Then backup whatever you set your docker local storage to?