Please drive traffic to registry.k8s.io (instead of k8s.gcr.io)

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Davanum Srinivas

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Apr 20, 2022, 10:54:28 AMApr 20
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Hi Folks,

Context: As a way to reduce costs for our GCR repositories, we have embarked on a project at sig-k8s-infra to spread the load/cost across cloud providers, we are starting with AWS. Please see [1] and [2] for more info.

Ask: If you are setting up new clusters or in charge of CI jobs for your organization, could you please help drive traffic to registry.k8s.io? For example kubeadm has a `--image-repository` [3]. So essentially wherever you see "k8s.gcr.io" that can be "registry.k8s.io" instead.

Why: we want to see how our new OCI proxy holds up under load [4]

Thanks,
Dims

Owen Tuz

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Apr 20, 2022, 11:23:12 AMApr 20
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Hi Dims,

Thanks for this - it looks like a great initiative and I'm really pleased to see it :)

Do you have a view on whether we should start to migrate public resources (such as Helm charts or tools that reference images on k8s.gcr.io) yet?

Or are we treating this as purely a load test at this stage - ie, please opt-in your own resources if you can, but on the understanding that it's under development?

Thanks,

Owen

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Davanum Srinivas

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Apr 20, 2022, 11:26:41 AMApr 20
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Owen,

the latter right now. "purely a load test at this stage - ie, please opt-in your own resources if you can, but on the understanding that it's under development"

thanks,
Dims

Lars Ekman

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Apr 21, 2022, 3:24:29 AMApr 21
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Hi,

I get a problem with coredns using this;

kubeadm > docker pull registry.k8s.io/coredns:v1.8.6
Error response from daemon: manifest for registry.k8s.io/coredns:v1.8.6 not found: manifest unknown: Failed to fetch "v1.8.6" from request "/v2/coredns/manifests/v1.8.6".

This is for K8s v1.24.0-rc.0

Best Regards,
Lars Ekman

Davanum Srinivas

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Apr 21, 2022, 6:54:05 AMApr 21
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Lars,

good rule of thumb, if it is NOT in k8s.gcr.io, the registry.k8s.io won't work. So if you check a docker pull against k8s.gcr.io you can see that it is missing there as well.

$ docker pull k8s.gcr.io/coredns:v1.8.6
Error response from daemon: manifest for k8s.gcr.io/coredns:v1.8.6 not found: manifest unknown: Failed to fetch "v1.8.6" from request "/v2/coredns/manifests/v1.8.6".

thanks,
Dims

Lars Ekman

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Apr 21, 2022, 7:27:17 AMApr 21
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Hi,

The problem is weirder:


But:


When "--image-repository registry.k8s.io" is used the coredns url loses a "coredns/" item.

Regards,
L Ekman

Marko Mudrinić

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Apr 21, 2022, 7:30:37 AMApr 21
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This is the expected behavior.

From the Kubernetes 1.22 changelog[1]:

> Kubeadm: when using a custom image repository for CoreDNS kubeadm now will append the coredns image name instead of coredns/coredns, thus restoring the behaviour existing before the v1.21 release. Users who rely on nested folder for the coredns image should set the clusterConfiguration.dns.imageRepository value including the nested path name (e.g using registry.company.xyz/coredns will force kubeadm to use registry.company.xyz/coredns/coredns image). No action is needed if using the default registry (k8s.gcr.io). (#102502, @ykakarap)



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