Suddenly dnsmasq stopped to resolve hostnames in OpenShift

Solution In Progress - Updated -

Issue

  • Suddenly dnsmasq stopped to resolve hostnames in OpenShift
    • Issue started to appear at particular node, it was working until the issue so it's not a configuration error
    • There is no obvious errors in dnsmasq log nor configuration error in configuration files
    • Issue disappears when dnsmasq is restarted
    • Failure pattern seems to vary:
      • Only TCP DNS query from pod doesn't work while other queries all work
      • All queries don't work

Environment

  • Red Hat OpenShift Container Platform

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