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OCPBUGS-114936: add PodDisruptionBudget for the HyperShift Operator - #9526
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📝 WalkthroughWalkthroughThe installer now creates and applies a Sequence Diagram(s)sequenceDiagram
participant Installer
participant PDBBuilder
participant Kubernetes
Installer->>PDBBuilder: Build operator PodDisruptionBudget
PDBBuilder->>Kubernetes: Return PDB resource
Installer->>Kubernetes: Apply deployment, service, and PDB
Suggested reviewers: Priority: ⬇️ Low Merge Risk: 🔵 Low · up to The installer emits the PDB, but its scenario test does not validate the replica configurations it claims to cover. Align the test inputs before merging. 🚥 Pre-merge checks | ✅ 11✅ Passed checks (11 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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@dhgautam99: This pull request references Jira Issue OCPBUGS-114936, which is valid. The bug has been moved to the POST state. 3 validation(s) were run on this bug
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Inline comments:
In `@cmd/install/install.go`:
- Line 1435: Update the addon RBAC associated with hypershift-addon-agent-sa to
grant the required policy/poddisruptionbudgets permissions before the
PodDisruptionBudget returned by the install flow is applied. Verify the
ClusterRole and its binding cover the addon install Job and preserve existing
permissions.
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cmd/install/assets/hypershift_operator.gocmd/install/install.gocmd/install/install_test.go
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
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Dropped some comments. Thanks!
| func TestHyperShiftOperatorPodDisruptionBudget(t *testing.T) { | ||
| // The PDB must be emitted for every install regardless of the effective | ||
| // operator replica count, and must use maxUnavailable:1 so it never | ||
| // deadlocks drains of a single-replica deployment. |
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This comment says "must use maxUnavailable:1" but the assertions below check for minAvailable:1 — and the assertion message says "should use minAvailable, not maxUnavailable". The comment and the code contradict each other. Whichever strategy you pick, they need to agree.
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Fixed the comment to use minAvailable.
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: dhgautam99, jparrill The full list of commands accepted by this bot can be found here. The pull request process is described here DetailsNeeds approval from an approver in each of these files:
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Inline comments:
In `@cmd/install/install_test.go`:
- Line 1091: Update the test setup around hyperShiftOperatorManifests to apply
defaults or explicitly set HyperShiftOperatorReplicas for each scenario so the
inputs match their labels. If these cases are intended to verify replica counts,
add assertions against the rendered Deployment rather than relying only on the
independently built PDB.
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Code Review Recommendations
1. Add PDB-selector-to-Deployment-labels cross-validation in the install test
cmd/install/install_test.go — TestHyperShiftOperatorPodDisruptionBudget
The test validates PDB field values in isolation but does not assert the fundamental contract: that the PDB selector actually matches the Deployment's pod template labels, and that both live in the same namespace. If the labels ever diverge, the PDB silently stops protecting the operator pods.
Suggested additions inside the t.Run loop, after the existing assertions:
// The PDB must target the same namespace and pods as the Deployment.
g.Expect(pdb.Namespace).To(Equal(operatorDeployment.Namespace),
"PDB and Deployment must be in the same namespace")
for k, v := range pdb.Spec.Selector.MatchLabels {
g.Expect(operatorDeployment.Spec.Template.Labels).To(HaveKeyWithValue(k, v),
"PDB selector must match Deployment pod template labels")
}2. Update setupOperatorResources doc comment
cmd/install/install.go:1372-1374
The function comment currently reads:
// setupOperatorResources creates the operator Deployment and Service resources.It should mention the PDB now that the function also creates one:
// setupOperatorResources creates the operator Deployment, Service, and PodDisruptionBudget resources.
The HyperShift Operator runs highly available (2 replicas by default when webhooks are enabled) but had no PodDisruptionBudget. Nothing prevented a routine voluntary maintenance operation, such as draining two nodes back-to-back during a node upgrade, from evicting both replicas in immediate succession and taking the operator fully offline, halting reconciliation for every HostedCluster it manages. Add a PodDisruptionBudget to the operator install manifest set with minAvailable: 1 and unhealthyPodEvictionPolicy: AlwaysAllow, selecting the operator pods via name=operator. The budget is always emitted so the protection is present regardless of the effective replica count. Note a cross-repo dependency: on MCE/ROSA the operator is installed by the hypershift-addon install Job, whose ServiceAccount must be granted policy/poddisruptionbudgets permissions in the addon agent ClusterRole (stolostron/hypershift-addon-operator, and openshift/managed-cluster-config for the SRE-P/ROSA fleet), otherwise the install Job fails on the forbidden PDB apply. That RBAC must land before this change reaches MCE. Refs: OCPBUGS-114936 Signed-off-by: Dhruv Gautam <dgautam@redhat.com>
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/verified by @dhgautam99 Test ResultsOperator installation with hypershift binary: Operator installation via MCE:
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Fix included in release 5.1.0-0.nightly-2026-09-26-044022 |
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What this PR does / why we need it:
The HyperShift Operator (HO) runs highly available (2 replicas by default when webhooks are enabled) but has no
PodDisruptionBudget. Nothing prevents a routine voluntary maintenance operation — for example draining two nodes back-to-back during a node upgrade or cordon/drain cycle — from evicting both HO replicas in immediate succession and taking the operator fully offline, which halts reconciliation for every HostedCluster it manages. Each individual drain looks legitimate to Kubernetes; without a PDB there is no floor stopping the second eviction while the first replica is still rescheduling.This PR adds a
PodDisruptionBudgetto the operator install manifest set:minAvailable: 1unhealthyPodEvictionPolicy: AlwaysAllowname: operatorThe budget is always emitted so the protection is present regardless of the effective replica count. This governs only the voluntary, eviction-API path (
oc adm drain, cluster autoscaler consolidation, etc.); it does not change HO behavior otherwise.Which issue(s) this PR fixes:
Fixes OCPBUGS-114936
Depends on:
Special notes for your reviewer:
Important
Cross-repo RBAC dependency — must land before this reaches MCE/ROSA.
On MCE/ROSA the HO is not installed by an admin running
hypershift install; it is installed by the hypershift-addon install Job, running as ServiceAccounthypershift-addon-agent-sa. That SA's ClusterRole does not currently permit managingpoddisruptionbudgets, so adding a PDB to the install manifest set causes the apply to be rejected and the whole install Job to fail.Verified live (MCE 2.17.2, hub OCP 4.20.x):
applied Deployment/Service ...thenpoddisruptionbudgets.policy "operator" is forbidden: User "system:serviceaccount:open-cluster-management-agent-addon:hypershift-addon-agent-sa" cannot patch resource "poddisruptionbudgets" in API group "policy"oc auth can-i create poddisruptionbudgets.policy -n hypershift --as=...hypershift-addon-agent-sa→ no (whiledeployments.apps→ yes)hypershift-install-job-*pods repeatedlyFailed; the Deployment applies (pods run) but the PDB is never created.This feature therefore spans three coordinated PRs:
policy/poddisruptionbudgets(get/list/watch/create/update/patch/delete) to the agent ClusterRole (the*-hypershift-addon-agentrole shipped via theaddon-hypershift-addon-deployManifestWork). Load-bearing for all MCE.hypershift-addon-agentClusterRole (deploy/hypershift-addon-agent-rbac/) for the SRE-P/ROSA management-cluster fleet.Sequencing: land #2 (and #3 for ROSA) before this PR reaches MCE, or the addon install Job breaks fleet-wide on the forbidden PDB apply. Details tracked on OCPBUGS-114936.
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New Features
Tests