kubernetes-sigs
Bring back configmap RBAC permissions
What this PR does / why we need it: This change https://github.com/kubernetes-sigs/metrics-server/commit/4a65c6aeade18c8db98b3266a663d6f7962902b5 doesn't allow to run metrics-server in a separate namespace anymore.
Bring back at least configmap permissions to allow for extension-apiserver-authentication::client-ca-file retrieval.
The committers listed above are authorized under a signed CLA.
- :white_check_mark: login: ViliusS / name: Vilius Šumskas (1677572fb01f3d8ab78a45074e0d1a8388a7f508)
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Hi @ViliusS. Thanks for your PR.
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Running metrics-server in different namespace than "kube-system" is not supported in official manifests.
Running metrics-server in different namespace than "kube-system" is not supported in official manifests.
Even if it is so, previous change breaks compatibility.
BTW, we were using metrics-server in different namespace for the past 2 years without issues. With this commit, we can use it again.
Breaking change cannot be breaking if the behavior that was broken was never officially supported.
I would need to see much more user impact to consider users using different namespace as valid use case. Users are free to modify official manifests, but this means they are expected to maintain the changes themselves. We just don't have enough capacity to support and test all possible configurations.
You might want to consider using official Helm chart as it supports running in different namespace.
Not sure how helm chart is built, but it looks like template still contains the same permission I'm proposing to bring back in manifest https://github.com/kubernetes-sigs/metrics-server/blob/cd7cd4a936b76332423602ac82289da49d6066b1/charts/metrics-server/templates/clusterrole.yaml#L21 Maybe this is why metrics-server installed via Helm works.
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If this will not be supported upstream, you can change this behavior on your side, and before deploying your metric server, you can add that change.
@serathius, what are your thoughts here?
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