migrate containerd registry endpoint to hosts.toml

[matthyx]

see kubernetes/kubernetes#110312

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @matthyx. Thanks for your PR.

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[BenTheElder]

Were it so easy https://kind.sigs.k8s.io/docs/user/local-registry/

#2875

[BenTheElder]

This change is a significant regression to our users and we don't have an obvious path forward. Today we make it easy to patch containerd config.

Tomorrow that will be useless and users will have to create and mount an additional file or we will have to add some other UX.

Also, when we enable this, these images become broken for users leveraging the existing format.

[aojea]

🍿 kubernetes/kubernetes#110312 (comment)

it seems this will take some time

[matthyx]

/hold
ok

[BenTheElder]

I think we will probably have to design a KIND registry config format to shim this, so we can backend it with either containerd inline or the hosts dir.

When doing so we also need to consider the longstanding feature request for a built-in registry user experience.

[BenTheElder]

KIND probably won't be able to just sit on an LTS release forever, because it will block k8s development to not pick up new CRI features. It's unclear how long we have until 2.0 though.

[matthyx]

do you have a KinDEP process ;-) ?

[aojea]

do you have a KinDEP process ;-) ?

there was some try IIRC, I think that Ben also opened an issue about that

[BenTheElder]

https://kind.sigs.k8s.io/docs/contributing/getting-started/ points to discussing designs in an issue before moving to implementation. You can see some examples of issues outlining designs.

[k8s-ci-robot]

PR needs rebase.

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[BenTheElder]

we just removed this config from the base image, we still need a good plan for how users can reasonably switch over with their custom registry configs. we have other much more pressing issues at the moment though.

[BenTheElder]

#3122

[matthyx]

Yeah, I let that rot a bit... thanks Ben.

[BenTheElder]

thanks for the PR, this is going to be a mess to finish sorting out 😅