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  1. Red Hat Advanced Cluster Management
  2. ACM-2256

[Submariner] - Vsphere cluster shows Pod Security admission controller warnings

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      Description of problem:

      ACM 2.7 / Submariner 0.14.0

      When running subctl diagnose firewall inter-cluster check on vsphere cluster, Pod Security admission controller warnings appears.

      When the above command executed between vsphere and aws cluster, only if the vsphere cluster is first, the following warning appears:

      ⚠ Starting with Kubernetes 1.23, the Pod Security admission controller expects namespaces to have security labels. Without these, you will see warnings in subctl's output. subctl should work fine, but you can avoid the warnings and ensure correct behavior by adding at least one of these labels to the namespace "default":
        pod-security.kubernetes.io/enforce=privileged
        pod-security.kubernetes.io/audit=privileged
        pod-security.kubernetes.io/warn=privileged 

      The submariner-operator namespace has the required labels:

      apiVersion: v1
      kind: Namespace
      metadata:
        annotations:
          kubectl.kubernetes.io/last-applied-configuration: |
            {"apiVersion":"v1","kind":"Namespace","metadata":{"annotations":{},"labels":{"pod-security.kubernetes.io/audit":"privileged","pod-security.kubernetes.io/enforce":"privileged","pod-security.kubernetes.io/warn":"privileged"},"name":"submariner-operator"}}
          openshift.io/sa.scc.mcs: s0:c26,c25
          openshift.io/sa.scc.supplemental-groups: 1000700000/10000
          openshift.io/sa.scc.uid-range: 1000700000/10000
        creationTimestamp: "2022-12-01T16:58:29Z"
        labels:
          kubernetes.io/metadata.name: submariner-operator
          olm.operatorgroup.uid/49d2ca8b-dcdf-4e1c-9a8f-5c09a49dd37a: ""
          pod-security.kubernetes.io/audit: privileged
          pod-security.kubernetes.io/audit-version: v1.24
          pod-security.kubernetes.io/enforce: privileged
          pod-security.kubernetes.io/warn: privileged
          pod-security.kubernetes.io/warn-version: v1.24
        name: submariner-operator
        ownerReferences:
        - apiVersion: work.open-cluster-management.io/v1
          kind: AppliedManifestWork
          name: 5fd0bf4ade2c79071b989f39af47f34a893de281b892c5a7aef575c94fef288e-addon-submariner-deploy-0
          uid: 4339f6c5-8b50-42f4-a76d-0de5f7872e1c
        resourceVersion: "223589"
        uid: 7d8221bb-8167-457f-a1d7-500a517a7c1c
      spec:
        finalizers:
        - kubernetes
      status:
        phase: Active

      In additional, as could be seen from the error, it specifies default namespace, which is not used in submariner deployment and indeed does not have the labels.
      If executing the same check and putting aws cluster first, the warning is not shown.

              sgaddam@redhat.com Gaddam Sridhar
              mbabushk@redhat.com Maxim Babushkin
              Maxim Babushkin Maxim Babushkin
              ACM QE Team
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                Created:
                Updated:
                Resolved: