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How to maintain a local repository of docker images in case they go offline?

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ComradeMiao@lemmy.world
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Thanks for all the great replies!

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undefined@lemmy.hogru.ch
0 points

Isn’t a Docker registry just HTTP? Would a caching proxy be too hard to use for this?

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just_another_person@lemmy.world
28 points

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.

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Rikudou_Sage@lemmings.world
7 points

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.

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just_another_person@lemmy.world
6 points

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.

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GBU_28@lemm.ee
1 point

Then backup whatever you set your docker local storage to?

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thirdBreakfast@lemmy.world
16 points

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.

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Foster Hangdaan@lemmy.fosterhangdaan.com
8 points

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.

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Lem453@lemmy.ca
11 points

The vast majority of selfhosters probably don’t but if you want its called a private repository

https://www.digitalocean.com/community/tutorials/how-to-set-up-a-private-docker-registry-on-ubuntu-20-04

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timbuck2themoon@sh.itjust.works
4 points

Just use a sonatype nexus 3 image and proxy docker hub, etc. Then you pull images through it.

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precarious_primes@lemmy.ml
3 points

We run this at work so we have forever copies of image tags and to reduce dockerhub rate limit issues. Works well even for a large dev team.

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