What is the maximum number of search domains that can be used in OpenShift 4.x?

Solution Verified - Updated -

Issue

  • Error message shown in /etc/resolv.conf on pods:
Search Line limits were exceeded, some search paths have been omitted, the applied search line is: <namespace>.svc.cluster.local svc.cluster.local cluster.local mycluster.my.domain.com my.domain.com domain.com
  • Need more than 6 domains in the /etc/resolv.conf search list.
  • Only the first 6 domains in the search path are looked up by the resolver.
  • Only first 3 custom search domains are observed by pods on OpenShift

Environment

  • Red Hat OpenShift Container Platform (OCP) 4.x

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