Juju core k8s charm container image is hosted on dockerhub hitting rate limits

[Rob Gibbon]

Running Juju 3.3, I'm hitting dockerhub API rate limits on my JuJu k8s environment. Dockerhub seems a poor choice to host core Juju images.

I expect Juju to just work without me having to have an account or take out a subscription to dockerhub. I'd that's not the case, then the documentation should be updated to clearly explain that users require a dockerhub subscription.

[Ian Booth (wallyworld)]

dockerhub has been in use since before rate limits were introduced. We ultimately want to use the rock infrastructure to serve the images. But until that's ready, we also publish to ghcr and ecr, and you can select one of those at bootstrap using

--config caas-image-repo="public.ecr.aws/juju"

or

--config caas-image-repo="ghcr.io/juju"

as a bootstrap option.

We will need to check the doc to make sure it covers this.

[Rob Gibbon (robgibbon)]

when I run `juju switch controller; juju config controller` I don't see caas-image-repo in the available config options? Running the command `juju config controller caas-image-repo="public.ecr.aws/juju` bombs with an error.
Is it only possible to set it at bootstrap? Also, is it possible this only applies to a Juju controller bootstrapped on a K8s platform? I'm running my controllers on MAAS

[Rob Gibbon (robgibbon)]

This also doesn't work

juju controller-config caas-image-repo="public.ecr.aws/juju"
ERROR cannot change caas-image-repo as it is not currently set (not valid)

Checking the docs, it says it should work. https://juju.is/docs/juju/list-of-controller-configuration-keys#heading--caas-image-repo

[Jeffrey Chang (modern911)]

I can bootstrap juju controller on top of k8s with --config caas-image-repo="public.ecr.aws/juju".

[Ian Booth (wallyworld)]

It's a read only setting. You can't change it after bootstrap.

[Harry Pidcock (hpidcock)]

It can't be changed after bootstrap except to adjust credentials used for a custom registry.

[Joseph Phillips (manadart)]

I've triaged it as wish-list, as we do plan to address as part of future feature work.