Cache Azure Container Registry Repositories

[JXavierMSFT]

Caching for ACR will soon allow users to cache repositories from other Azure Container Registries. This functionality is tentatively scheduled for release in late December 2023.

[mac2000]

here is one more use case, where limit of 50 rules won't work

problem: it may be hard to safely cleanup container registry, and in some cases registries are filled up quickly with tens of terabytes of images

idea:

imagine following setup:

• we have main.azurecr.io where each and every image published, it has quadrillion of images and weights tens of terabytes, it is hard to clean it up
• we have cache.azurecr.io side by side, configured as read only cache proxy against main.azurecr.io, all our Kubernetes clusters and other docker related services are talking to it

as result:

• it should be safe to remove images older than X months from main.azurecr.io
• it is still hard to cleanup cache.azurecr.io but it will be much smaller, because it holds only images used at least once
• cache.azurecr.io may be used to bypass limits from docker, quaye, etc.

why:

while playing with Azure Container Registry and connecting it, it took only 2 days to fill 50gb of data

when:

seems like limit of 50 rules is real blocker here, as a workaround we probably may have many registries, but it is error prone

alternative: of course, it will be much better to have idempotent builds and image tagging strategy that will override labels, but that's not always suitable

[davidkarlsen]

It is annoying that you need to define a cache-rule for each and every repo - having a wildcard like docker.io/* mapping over to a prefix of docker.io/ within ACR would scale a lot better.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[sajayantony]

@JXavierMSFT do we have any updates on prefix matching.

[JXavierMSFT]

We have released Wildcard cache rules. You can check the docs at aka.ms/acr/cache. However, we haven't released Azure Container Registry as an upstream yet. I will update this thread as soon as we release.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[floriankoch]

@JXavierMSFT anything new for caching ACR?