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  1. OpenShift Bugs
  2. OCPBUGS-7921

Instance shouldn't be moved back from f to a

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    • CLOUD Sprint 234, CLOUD Sprint 235
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      * Previously, the Control Plane Machine Set Operator prioritized failure domains alphabetically and moved machines from alphabetically later failure domains to alphabetically earlier failure domains, even if doing so did not improve the the availability of the machines across the failure domains. With this release, the Operator is updated to prioritize failure domains that are present in the existing machines and respect existing failure domains that provide better availability. (link:https://issues.redhat.com/browse/OCPBUGS-7921[*OCPBUGS-7921*])
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      * Previously, the Control Plane Machine Set Operator prioritized failure domains alphabetically and moved machines from alphabetically later failure domains to alphabetically earlier failure domains, even if doing so did not improve the the availability of the machines across the failure domains. With this release, the Operator is updated to prioritize failure domains that are present in the existing machines and respect existing failure domains that provide better availability. (link: https://issues.redhat.com/browse/OCPBUGS-7921 [* OCPBUGS-7921 *])
    • Bug Fix
    • Done

    Description

      Description of problem:

      Tested on gcp, there are 4 failureDomains a, b, c, f in CPMS, remove one a, a new master will be created in f. If readd f to CPMS, instance will be moved back from f to a

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

       

      How reproducible:

      Always

      Steps to Reproduce:

      Before update cpms.
      failureDomains:
        gcp:
        - zone: us-central1-a
        - zone: us-central1-b
        - zone: us-central1-c
        - zone: us-central1-f
$ oc get machine                  
NAME                              PHASE     TYPE            REGION        ZONE            AGE
zhsungcp22-4glmq-master-2         Running   n2-standard-4   us-central1   us-central1-c   3h4m
zhsungcp22-4glmq-master-hzsf2-0   Running   n2-standard-4   us-central1   us-central1-b   90m
zhsungcp22-4glmq-master-plch8-1   Running   n2-standard-4   us-central1   us-central1-a   11m
zhsungcp22-4glmq-worker-a-cxf5w   Running   n2-standard-4   us-central1   us-central1-a   3h
zhsungcp22-4glmq-worker-b-d5vzm   Running   n2-standard-4   us-central1   us-central1-b   3h
zhsungcp22-4glmq-worker-c-4d897   Running   n2-standard-4   us-central1   us-central1-c   3h

1. Delete failureDomain "zone: us-central1-a" in cpms, new machine Running in zone f.
      failureDomains:
        gcp:
        - zone: us-central1-b
        - zone: us-central1-c
        - zone: us-central1-f 
$ oc get machine              
NAME                              PHASE     TYPE            REGION        ZONE            AGE
zhsungcp22-4glmq-master-2         Running   n2-standard-4   us-central1   us-central1-c   3h19m
zhsungcp22-4glmq-master-b7pdl-1   Running   n2-standard-4   us-central1   us-central1-f   13m
zhsungcp22-4glmq-master-hzsf2-0   Running   n2-standard-4   us-central1   us-central1-b   106m
zhsungcp22-4glmq-worker-a-cxf5w   Running   n2-standard-4   us-central1   us-central1-a   3h16m
zhsungcp22-4glmq-worker-b-d5vzm   Running   n2-standard-4   us-central1   us-central1-b   3h16m
zhsungcp22-4glmq-worker-c-4d897   Running   n2-standard-4   us-central1   us-central1-c   3h16m
2. Add failureDomain "zone: us-central1-a" again, new machine running in zone a, the machine in zone f will be deleted.
      failureDomains:
        gcp:
        - zone: us-central1-a
        - zone: us-central1-f
        - zone: us-central1-c
        - zone: us-central1-b
$ oc get machine                          
NAME                              PHASE     TYPE            REGION        ZONE            AGE
zhsungcp22-4glmq-master-2         Running   n2-standard-4   us-central1   us-central1-c   3h35m
zhsungcp22-4glmq-master-5kltp-1   Running   n2-standard-4   us-central1   us-central1-a   12m
zhsungcp22-4glmq-master-hzsf2-0   Running   n2-standard-4   us-central1   us-central1-b   121m
zhsungcp22-4glmq-worker-a-cxf5w   Running   n2-standard-4   us-central1   us-central1-a   3h32m
zhsungcp22-4glmq-worker-b-d5vzm   Running   n2-standard-4   us-central1   us-central1-b   3h32m
zhsungcp22-4glmq-worker-c-4d897   Running   n2-standard-4   us-central1   us-central1-c   3h32m 

      Actual results:

      Instance is moved back from f to a

      Expected results:

      Instance shouldn't be moved back from f to a

      Additional info:

      https://issues.redhat.com//browse/OCPBUGS-7366

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        Issue Links

          blocks

          Bug - A problem that impairs or prevents the functions of the product. OCPBUGS-11968 Instance shouldn't be moved back from f to a

          • Normal - To be worked after urgent and high priorities are resolved. This term is chosen when the severity of an issue is relatively close to the level of effort to fix it. The existence of an easily implemented workaround can also lead to this priority level instead of a higher priority.
          • Closed
          is cloned by

          Bug - A problem that impairs or prevents the functions of the product. OCPBUGS-11968 Instance shouldn't be moved back from f to a

          • Normal - To be worked after urgent and high priorities are resolved. This term is chosen when the severity of an issue is relatively close to the level of effort to fix it. The existence of an easily implemented workaround can also lead to this priority level instead of a higher priority.
          • Closed
          links to

          GitHub openshift/cluster-control-plane-machine-set-operator#196: OCPBUGS-7921: Prioritise machine mapping over alphabetical mapping

          Web Link RHSA-2023:5006 OpenShift Container Platform 4.14.z security update

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              joelspeed Joel Speed
              rhn-support-zhsun Zhaohua Sun
              Zhaohua Sun Zhaohua Sun
              Jeana Routh Jeana Routh
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                Updated:
                Resolved: