Support PDBs for DS

[ravisantoshgudimetla]

What happened?

While reviewing kubernetes/enhancements#3089 @smarterclayton suggested that PDBs should be opaque to the backing controllers for the pods. As of now, PDBs are not supported for DS since it doesn't have scale subresource. Clayton suggested to introduce a read only scale subresource to DS so that PDBs can be supported for DS.

In addition, we are going to have an e2e which proves that the PDB can work for any arbitrary controller and minAvailable should work for out of tree controllers. We should make this part of conformance test

What did you expect to happen?

PDB working for DS just like for deployment or other controllers

How can we reproduce it (as minimally and precisely as possible)?

• Create a PDB
• Map it to DS
• PDB is not honored while evicting pods for DS

Anything else we need to know?

No response

Kubernetes version

$ kubectl version
# paste output here

Cloud provider

OS version

# On Linux:
$ cat /etc/os-release
# paste output here
$ uname -a
# paste output here

# On Windows:
C:\> wmic os get Caption, Version, BuildNumber, OSArchitecture
# paste output here

Install tools

Container runtime (CRI) and and version (if applicable)

Related plugins (CNI, CSI, ...) and versions (if applicable)

[k8s-ci-robot]

@ravisantoshgudimetla: This issue is currently awaiting triage.

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[ravisantoshgudimetla]

cc @soltysh @atiratree @shvgn

[neolit123]

/sig apps

[shvgn]

/assign

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[shvgn]

/remove-lifecycle stale

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[shvgn]

/remove-lifecycle stale

[k8s-triage-robot]

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/lifecycle stale

[shvgn]

/remove-lifecycle stale

[shvgn]

It's WIP #98307

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

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/lifecycle stale

[shvgn]

/remove-lifecycle stale

[jonathan-innis]

Seems like this is still an issue since it hasn't been closed. This was definitely surprising behavior for me as I was working through trying to clean-up our PDB evaluation behavior in Karpenter here: kubernetes-sigs/karpenter#789. I would expect a daemonset pod to be evicted and drained in the same way as any other pod on the cluster. I get that there isn't a strong use-case for using PDBs against DS, but it feels like the concept should work the same regardless of the owner.

[k8s-triage-robot]

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/lifecycle rotten