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  1. OpenShift Bugs
  2. OCPBUGS-59225

DNS unstable during SDN -> OVN migration

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    • CORENET Sprint 273
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      Description of problem:

      During one of the incidents, we noticed that DNS was failing. We observed that customer pods were blocked from launching. SRE rolled all the openshift-dns pods to let customer workloads launch. 
      
          

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

      4.16.41
          

      How reproducible:

      We came across the issue during an incident. We still do not have a clear idea how to reproduce this reliably.
          

      Steps to Reproduce:

      We came across the issue during an incident. We still do not have a clear idea how to reproduce this reliably.
          

      Actual results:
      Some Machine API Controller pods were showing this error with DNS

      Post \"https://sts.amazonaws.com/\": dial tcp: lookup sts.amazonaws.com on 10.*.*.*:*: read udp 10.*.*.*:*->10.*.*.*:*: i/o timeout
          

      Expected results:

      DNS resolution should be generally stable during migration
          

      Additional info:

      
          

              pliurh Peng Liu
              taislam.osd Tafhim Ul Islam
              None
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              Zhanqi Zhao Zhanqi Zhao
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                Created:
                Updated: