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  1. OpenShift Bugs
  2. OCPBUGS-54645

Unable to create UDN on a HCP cluster with Kubevirt

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      Description of problem: Unable to create UDN on a HCP (kubevirt) cluster unless a custom Join Subnet is used

      Version-Release number of selected component (if applicable): 4.18

      How reproducible: Always

      Details

      When a udn with any subnet value it always throws the following error

       

      apiVersion: k8s.ovn.org/v1
kind: UserDefinedNetwork
metadata:
  creationTimestamp: '2025-04-06T08:12:55Z'
  finalizers:
    - k8s.ovn.org/user-defined-network-protection
  generation: 1
  name: udn-1
  namespace: hchaturv-udn-test
  resourceVersion: '22591'
  uid: 60d4556c-1d22-4c2e-b224-ab4628d1f5de
spec:
  layer2:
    role: Primary
    subnets:
      - 192.164.0.0/16
  topology: Layer2
status:
  conditions:
    - lastTransitionTime: '2025-04-06T08:12:55Z'
      message: 'failed to generate NetworkAttachmentDefinition: failed to render CNI network config: invalid subnet configuration: pod or join subnet overlaps with already configured internal subnets: illegal network configuration: user defined join subnet "100.65.0.0/16" overlaps built-in join subnet "100.65.0.0/16"'
      reason: SyncError
      status: 'False'
      type: NetworkCreated

      The same happens in the layer3 as well.

       

              sdn-team-bot sdn-team bot
              rhn-support-hchaturv Himank Chaturvedi
              None
              None
              Zhanqi Zhao Zhanqi Zhao
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                Created:
                Updated: