Why are xen guest systems showing 'unknown host' on Red Hat Network?

Solution Verified - Updated -


  • Red Hat Enterprise Linux 5
  • Xen Virtualization.


  • The virtual system shows "Unknown host" in Red Hat Network.


  1. Run the /usr/share/rhn/virtualization/poller.py to detect the guests on host system,
# python /usr/share/rhn/virtualization/poller.py
  1. Run the profile sync,
# rhn-profile-sync

Root Cause

  • Entries in cron job /etc/cron.d/rhn-virtualization.cron are commented,
# 0-59/2 * * * * root python /usr/share/rhn/virtualization/poller.py
  • The rhnsd service is not running.
# service rhnsd status

Diagnostic Steps

  • Check whether /etc/cron.d/rhn-virtualization.cron has correct entry as below and it should not be commented,
# cat /etc/cron.d/rhn-virtualization.cron
 0-59/2 * * * * root python /usr/share/rhn/virtualization/poller.py

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