lookup root-server.net i/o timeout in Openshift with nmstate

Solution Verified - Updated -

Environment

Openshift Container Platform 4.11
Openshift Container Platform 4.12 subsequent to .42 z-stream

Issue

nmstate-handler pod logs show the following error:

failed checking DNS connectivity

Followed by:

lookup root-server.net

Resolution

This was a bug that has been resolved in kubernetes-nmstate-operator version 4.12.0-202310311002 released with OCP 4.12.42. The recommendation is to upgrade the Openshift cluster to 4.12 latest z-stream or upgrade the kubernetes-nmstate-operator to version 4.12.0-202310311002 or later.

Root Cause

The domain name is incorrect, and should be root-servers.net.

More information can be found via the upstream pull request. Backport to OCP 4.12.z was tracked in OCPBUGS-22480.

Diagnostic Steps

Inspect the nmsate-handler pod logs:

$ oc logs nmstate-handler-xxxxx -n openshift-nmstate | grep root-server

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