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  1. OpenShift Bugs
  2. OCPBUGS-2013

4.10: When adding nodes, the overlapped node-subnet can be allocated.

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    • OCP VE Sprint 225, OCP VE Sprint 226, OCP VE Sprint 227, OCP VE Sprint 228, OCP VE Sprint 229, OCP VE Sprint 230, OCP VE Sprint 231, OCP VE Sprint 232
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      Description of problem:

      When adding new nodes to the existing cluster, the newly allocated node-subnet can be overlapped with the existing node.

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

      openshift 4.10.30

      How reproducible:

      It's quite hard to reproduce but  there is a possibility it can happen any time. 

      Steps to Reproduce:

      1. Create a OVN dual-stack cluster
2. add nodes to the existing cluster
3. check the allocated node subnet

      Actual results:

      Some newly added nodes have the same node-subnet and ovn-k8s-mp0 IP as some existing nodes.

      Expected results:

      Should have duplicated node-subnet and ovn-k8s-mp0 IP

      Additional info:

      Additional info can be found at the case 03329155 and the must-gather attached(comment #1) 

% omg logs ovnkube-master-v8crc -n openshift-ovn-kubernetes -c ovnkube-master | grep '2022-09-30T06:42:50.857'
2022-09-30T06:42:50.857031565Z W0930 06:42:50.857020       1 master.go:1422] Did not find any logical switches with other-config
2022-09-30T06:42:50.857112441Z I0930 06:42:50.857099       1 master.go:1003] Allocated Subnets [10.131.0.0/23 fd02:0:0:4::/64] on Node worker01.ss1.samsung.local
2022-09-30T06:42:50.857122455Z I0930 06:42:50.857105       1 master.go:1003] Allocated Subnets [10.129.4.0/23 fd02:0:0:a::/64] on Node oam04.ss1.samsung.local
2022-09-30T06:42:50.857130289Z I0930 06:42:50.857122       1 kube.go:99] Setting annotations map[k8s.ovn.org/node-subnets:{"default":["10.131.0.0/23","fd02:0:0:4::/64"]}] on node worker01.ss1.samsung.local
2022-09-30T06:42:50.857140773Z I0930 06:42:50.857132       1 kube.go:99] Setting annotations map[k8s.ovn.org/node-subnets:{"default":["10.129.4.0/23","fd02:0:0:a::/64"]}] on node oam04.ss1.samsung.local
2022-09-30T06:42:50.857166726Z I0930 06:42:50.857156       1 master.go:1003] Allocated Subnets [10.128.2.0/23 fd02:0:0:5::/64] on Node oam01.ss1.samsung.local
2022-09-30T06:42:50.857176132Z I0930 06:42:50.857157       1 master.go:1003] Allocated Subnets [10.131.0.0/23 fd02:0:0:4::/64] on Node rhel01.ss1.samsung.local
2022-09-30T06:42:50.857176132Z I0930 06:42:50.857167       1 kube.go:99] Setting annotations map[k8s.ovn.org/node-subnets:{"default":["10.128.2.0/23","fd02:0:0:5::/64"]}] on node oam01.ss1.samsung.local
2022-09-30T06:42:50.857185257Z I0930 06:42:50.857157       1 master.go:1003] Allocated Subnets [10.128.6.0/23 fd02:0:0:d::/64] on Node call03.ss1.samsung.local
2022-09-30T06:42:50.857192996Z I0930 06:42:50.857183       1 kube.go:99] Setting annotations map[k8s.ovn.org/node-subnets:{"default":["10.131.0.0/23","fd02:0:0:4::/64"]}] on node rhel01.ss1.samsung.local
2022-09-30T06:42:50.857200017Z I0930 06:42:50.857190       1 kube.go:99] Setting annotations map[k8s.ovn.org/node-subnets:{"default":["10.128.6.0/23","fd02:0:0:d::/64"]}] on node call03.ss1.samsung.local
2022-09-30T06:42:50.857282717Z I0930 06:42:50.857258       1 master.go:1003] Allocated Subnets [10.130.2.0/23 fd02:0:0:7::/64] on Node call01.ss1.samsung.local
2022-09-30T06:42:50.857304886Z I0930 06:42:50.857293       1 kube.go:99] Setting annotations map[k8s.ovn.org/node-subnets:{"default":["10.130.2.0/23","fd02:0:0:7::/64"]}] on node call01.ss1.samsung.local
2022-09-30T06:42:50.857338896Z I0930 06:42:50.857314       1 master.go:1003] Allocated Subnets [10.128.4.0/23 fd02:0:0:9::/64] on Node f501.ss1.samsung.local
2022-09-30T06:42:50.857349485Z I0930 06:42:50.857329       1 master.go:1003] Allocated Subnets [10.131.2.0/23 fd02:0:0:8::/64] on Node call02.ss1.samsung.local
2022-09-30T06:42:50.857371344Z I0930 06:42:50.857354       1 kube.go:99] Setting annotations map[k8s.ovn.org/node-subnets:{"default":["10.128.4.0/23","fd02:0:0:9::/64"]}] on node f501.ss1.samsung.local
2022-09-30T06:42:50.857371344Z I0930 06:42:50.857361       1 kube.go:99] Setting annotations map[k8s.ovn.org/node-subnets:{"default":["10.131.2.0/23","fd02:0:0:8::/64"]}] on node call02.ss1.samsung.local

              pepalani@redhat.com Periyasamy Palanisamy
              soh@redhat.com Sehee Oh
              Anurag Saxena Anurag Saxena
              Sehee Oh
              Arti Sood
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                Created:
                Updated:
                Resolved: