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ClusterClass MachinePool implementation is probably not able to rollout BootstrapConfig changes.

Open sbueringer opened this issue 1 year ago • 18 comments

Quoting from a different issue:

Can you please summarize what a user would have to do to rollout a change to a KubeadmConfig with a reguar cluster (not using ClusterClass). Is it as simple as modifying the KubeadmConfig object that is linked in a MachinePool directly?

Change MachinePool.spec.template.spec.bootstrap.configRef.name and the KubeadmConfig.spec changes will be reconciled. In practice, that means a user's KubeadmConfig.metadata.name should be suffixed with a hash (or increasing number) when making changes, and the reference in the MachinePool object gets changed to this new KubeadmConfig name. https://github.com/kubernetes-sigs/cluster-api/issues/8858#issuecomment-2051049208

The ClusterClass MachinePool implementation today uses one single BootstrapConfig / KubeadmConfig object for a MachinePool and just continuously patches it in-place to rollout changes.

Based on #8858 this is not enough, it seems to be required to rotate the BootstrapConfig object (create a new one + update the ref in MachinePool).

Someone would need to confirm if my observation is correct.

Furthermore I don't know if there is a documented contract as of today for MachinePools how BootstrapConfigs are supposed to be rolled out. I also don't know if MachinePools behave the same across providers today.

So my tl;dr:

  • ClusterClass can probably not rollout BootstrapConfig changes for MachinePools today
  • We need a documented contract on how BootstrapConfig rollouts are supposed to work with MachinePools

sbueringer avatar Apr 23 '24 14:04 sbueringer

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k8s-ci-robot avatar Apr 23 '24 14:04 k8s-ci-robot

I don't have the know how about MachinePools and MachinePool implementations in providers to be 100% sure. I also don't have the time to do the required research, but I just wanted to surface this issue, so folks have a chance to fix it (or determine that everything is actually fine at the moment).

(cc @AndiDog @willie-yao, just fyi)

sbueringer avatar Apr 23 '24 14:04 sbueringer

/priority important-longterm /kind bug

fabriziopandini avatar Apr 24 '24 12:04 fabriziopandini

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/lifecycle stale

k8s-triage-robot avatar Jul 23 '24 13:07 k8s-triage-robot

/remove-lifecycle stale

sbueringer avatar Jul 23 '24 13:07 sbueringer

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/lifecycle stale

k8s-triage-robot avatar Oct 21 '24 14:10 k8s-triage-robot

/assign

Sunnatillo avatar Oct 31 '24 11:10 Sunnatillo

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/lifecycle rotten

k8s-triage-robot avatar Dec 27 '24 14:12 k8s-triage-robot

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/close not-planned

k8s-triage-robot avatar Jan 26 '25 14:01 k8s-triage-robot

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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/close not-planned

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k8s-ci-robot avatar Jan 26 '25 14:01 k8s-ci-robot

Still needed for machine pools

/reopen /remove-lifecycle rotten

richardcase avatar Apr 23 '25 12:04 richardcase

@richardcase: Reopened this issue.

In response to this:

Still needed for machine pools

/reopen /remove-lifecycle rotten

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k8s-ci-robot avatar Apr 23 '25 12:04 k8s-ci-robot

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

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/lifecycle stale

k8s-triage-robot avatar Jul 22 '25 12:07 k8s-triage-robot

Added to our tracking issue.

/remove-lifecycle stale /help

richardcase avatar Jul 25 '25 14:07 richardcase

@richardcase: This request has been marked as needing help from a contributor.

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In response to this:

Added to our tracking issue.

/remove-lifecycle stale /help

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k8s-ci-robot avatar Jul 25 '25 14:07 k8s-ci-robot