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  1. OpenShift Bugs
  2. OCPBUGS-12876

Cluster fails to convert from IPv6 Primary Dualstack to IPv6 single stack

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      Description of problem:

      Converting IPv6 Primary Dual Stack to IPv6 Single stack causing control plane failures. OVN masters in CLBO state peridically
      
      OVN masters logs: http://shell.lab.bos.redhat.com/~anusaxen/convert/
      
      MG is not working as cluster lands in bad shape. Happy to share cluster if needed for debugging

      Version-Release number of selected component (if applicable):

      4.13.0-0.nightly-2023-04-21-084440

      How reproducible:

      Always

      Steps to Reproduce:

      1.Bring cluster on IPv6 Primary Dual Stack
      
      2.Edit network.config.openshift.io from dual stack to single like as follow
      
      
      spec:
          clusterNetwork:
          - cidr: fd01::/48
            hostPrefix: 64
          - cidr: 10.128.0.0/14
            hostPrefix: 23
          externalIP:
            policy: {}
          networkType: OVNKubernetes
          serviceNetwork:
          - fd02::/112
          - 172.30.0.0/16
        status:
          clusterNetwork:
          - cidr: fd01::/48
            hostPrefix: 64
          - cidr: 10.128.0.0/14
            hostPrefix: 23
          clusterNetworkMTU: 1400
          networkType: OVNKubernetes
          serviceNetwork:
          - fd02::/112
          - 172.30.0.0/16
      
      
      TO
      
      
      
       apiVersion: v1
      items:
      - apiVersion: config.openshift.io/v1
        kind: Network
        metadata:
          creationTimestamp: "2023-04-27T14:11:37Z"
          generation: 3
          name: cluster
          resourceVersion: "81045"
          uid: 28f15675-e739-4262-9acc-4c2c0df4b38d
        spec:
          clusterNetwork:
          - cidr: fd01::/48
            hostPrefix: 64
          externalIP:
            policy: {}
          networkType: OVNKubernetes
          serviceNetwork:
          - fd02::/112
        status:
          clusterNetwork:
          - cidr: fd01::/48
            hostPrefix: 64
          clusterNetworkMTU: 1400
          networkType: OVNKubernetes
          serviceNetwork:
          - fd02::/112
      kind: List
      metadata:
        resourceVersion: ""
      
      3. Wait for control plane components to roll out successfully

      Actual results:

      Cluster fails with network, ETCD, Kube API and ingress failures

      Expected results:

      Cluster should convert to IPv6 single without any issues

      Additional info:

      MGs not working due to varios control place restricting it
      
      
      

            mkennell@redhat.com Martin Kennelly
            anusaxen Anurag Saxena
            Anurag Saxena Anurag Saxena
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              Created:
              Updated:
              Resolved: