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✨ Check control plane version skew before creating new launch template version #5560

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✨ Check control plane version skew before creating new launch template version #5560

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@fiunchinho fiunchinho commented Jun 19, 2025 •
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/kind feature

What this PR does / why we need it:

This is a draft PR to gather feedback about a potential approach to solve the k8s version skew problem, where AWSMachinePool workers are upgraded to newer k8s versions before the control plane nodes are upgraded.

Release note:

Check control plane version skew before creating new launch template version

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Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

@k8s-ci-robot k8s-ci-robot added do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. needs-priority labels Jun 19, 2025
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[APPROVALNOTIFIER] This PR is NOT APPROVED

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@k8s-ci-robot k8s-ci-robot added the size/M Denotes a PR that changes 30-99 lines, ignoring generated files. label Jun 19, 2025
@k8s-ci-robot k8s-ci-robot requested review from cnmcavoy and nrb June 19, 2025 12:53
@fiunchinho fiunchinho changed the title Check control plane version skew before creating new launch template … Check control plane version skew before creating new launch template version Jun 19, 2025
@k8s-ci-robot k8s-ci-robot added release-note Denotes a PR that will be considered when it comes time to generate release notes. and removed do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. labels Jun 19, 2025
@fiunchinho fiunchinho changed the title Check control plane version skew before creating new launch template version ✨ Check control plane version skew before creating new launch template version Jun 19, 2025
@fiunchinho fiunchinho force-pushed the control-plane-skew branch from d872e60 to ebb7acc Compare June 19, 2025 13:04
@fiunchinho fiunchinho changed the title ✨ Check control plane version skew before creating new launch template version WIP: ✨ Check control plane version skew before creating new launch template version Jun 19, 2025
@fiunchinho fiunchinho force-pushed the control-plane-skew branch 2 times, most recently from 09f90d8 to 8a507ce Compare June 19, 2025 23:19
@k8s-ci-robot k8s-ci-robot added size/L Denotes a PR that changes 100-499 lines, ignoring generated files. and removed size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Jun 19, 2025
@fiunchinho fiunchinho changed the title WIP: ✨ Check control plane version skew before creating new launch template version ✨ Check control plane version skew before creating new launch template version Jun 19, 2025
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/test all

@fiunchinho fiunchinho force-pushed the control-plane-skew branch from 8a507ce to 5e4e6e8 Compare June 20, 2025 12:32
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/retest

@fiunchinho fiunchinho marked this pull request as ready for review June 23, 2025 07:48
@k8s-ci-robot k8s-ci-robot removed the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label Jun 23, 2025
@k8s-ci-robot k8s-ci-robot requested a review from dlipovetsky June 23, 2025 07:48
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@fiunchinho: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name Commit Details Required Rerun command
pull-cluster-api-provider-aws-test 5e4e6e8 link true /test pull-cluster-api-provider-aws-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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richardcase
richardcase reviewed Jun 24, 2025
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I think this is a good approach to stop upgrading the MachinePools too early.

exp/controllers/awsmachinepool_controller.go
// isMachinePoolAllowedToUpgradeDueToControlPlaneVersionSkew checks if the control plane is being upgraded, in which case we shouldn't update the launch template.
func (r *AWSMachinePoolReconciler) isMachinePoolAllowedToUpgradeDueToControlPlaneVersionSkew(clusterScope cloud.ClusterScoper, machinePoolScope *scope.MachinePoolScope) (bool, error) {
if machinePoolScope.Cluster.Spec.ControlPlaneRef == nil {
return true, nil
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I don't think we'd want to proceed in this case with the upgrade.

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/milestone v2.9

@k8s-ci-robot k8s-ci-robot added this to the v2.9 milestone Jun 24, 2025
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