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[release-4.20] OCPBUGS-99227: Fix node.kubernetes.io/exclude-from-external-load-balancers on masters#129

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[release-4.20] OCPBUGS-99227: Fix node.kubernetes.io/exclude-from-external-load-balancers on masters#129
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This is an automated cherry-pick of #121

/assign mdbooth

mdbooth added 2 commits July 20, 2026 17:58
…balancers on masters

We previously used allHaveNodePrefix() to ensure that if a master
instance group contained the bootstrap machine this would not cause it
to be excluded from re-use. This worked because the bootstrap machine's
name has the same prefix as all other machines in the cluster.

However, this logic unconditionally always included the master instance
group. If the masters are labelled with
node.kubernetes.io/exclude-from-external-load-balancers the CCM
framework code will have filtered the Nodes before passing them to
provider-GCP. But this logic meant we added them anyway, sending
unintended traffic to the control plane machines.
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openshift-ci Bot requested review from damdo and nrb July 20, 2026 17:59
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[APPROVALNOTIFIER] This PR is NOT APPROVED

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@openshift-cherrypick-robot: Jira Issue OCPBUGS-84569 has been cloned as Jira Issue OCPBUGS-99227. Will retitle bug to link to clone.
/retitle [release-4.20] OCPBUGS-99227: Fix node.kubernetes.io/exclude-from-external-load-balancers on masters

Details

In response to this:

This is an automated cherry-pick of #121

/assign mdbooth

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@openshift-ci openshift-ci Bot changed the title [release-4.20] OCPBUGS-84569: Fix node.kubernetes.io/exclude-from-external-load-balancers on masters [release-4.20] OCPBUGS-99227: Fix node.kubernetes.io/exclude-from-external-load-balancers on masters Jul 20, 2026
@openshift-ci-robot openshift-ci-robot added jira/severity-important Referenced Jira bug's severity is important for the branch this PR is targeting. jira/valid-reference Indicates that this PR references a valid Jira ticket of any type. jira/invalid-bug Indicates that a referenced Jira bug is invalid for the branch this PR is targeting. labels Jul 20, 2026
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@openshift-cherrypick-robot: This pull request references Jira Issue OCPBUGS-99227, which is invalid:

  • release note text must be set and not match the template OR release note type must be set to "Release Note Not Required". For more information you can reference the OpenShift Bug Process.
  • expected dependent Jira Issue OCPBUGS-84569 to be in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but it is MODIFIED instead
  • expected dependent Jira Issue OCPBUGS-84569 to target a version in 4.21.0, 4.21.z, but it targets "5.0.0" instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

Details

In response to this:

This is an automated cherry-pick of #121

/assign mdbooth

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openshift-ci Bot commented Jul 20, 2026

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@openshift-cherrypick-robot: 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
ci/prow/unit e22ca1d link true /test unit

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