Openshift 4.X RHCoreOS: DNS queries timeout or take 5 seconds to respond.

Solution Verified - Updated -

Issue

  • we have sometimes slow dns resolution times (5 sec) with Openshift Pods.
  • Seen in applications and nslookup/getent commands.
  • Kernel has the fix for the problem described in https://access.redhat.com/solutions/3690091

Environment

  • Openshift 4.x
  • Coreos
    • kernel 4.18.0-80.11.2.el8_0.x86_64
  • VMWARE
  • DNS
    • CoreDNS pods with load balancing

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