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OCPBUGS-46422: Add a ValidatingAdmissionPolicy blocking ServiceCIDR changes [4.20] #2827

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Merged
openshift-merge-bot merged 1 commit into from
Nov 19, 2025
Merged

OCPBUGS-46422: Add a ValidatingAdmissionPolicy blocking ServiceCIDR changes [4.20] #2827

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25 changes: 25 additions & 0 deletions bindata/cluster-network-operator/servicecidr-vap.yaml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingAdmissionPolicy
metadata:
name: "servicecidrs.openshift.io"
spec:
failurePolicy: Fail
matchConstraints:
resourceRules:
- apiGroups: ["networking.k8s.io"]
apiVersions: ["v1"]
operations: ["CREATE", "UPDATE"]
resources: ["servicecidrs"]
validations:
# Allow apiserver to change the 'kubernetes' ServiceCIDR (when doing single/dual-stack
# migration). Reject all other changes with the given message.
- expression: "request.userInfo.username == 'system:apiserver' && 'system:masters' in request.userInfo.groups"
message: "changing service CIDRs in a running cluster is not supported"
---
apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingAdmissionPolicyBinding
metadata:
name: "servicecidrs-binding"
spec:
policyName: "servicecidrs.openshift.io"
validationActions: [Deny]