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Register in RHN after installation

There are many situations where we need to register the host/server to RHN server manually, due to network issues, bad certificate/authentication or time difference on the host during installation.

Manual RHN registration is quite easy

1. Check /etc/sysconfig/rhn/systemid file already exist, if YES delete the file

# rm /etc/sysconfig/rhn/systemid

2. Register with the update agent using rhn_register

# rhn_register


Other useful RHN client commands

Sync configuration files from RHN server

rhncfg-client get <filename>
rhncfg-client get #for all files.

To view the differences between the config files deployed on the system and those stored by RHN, issue the command:

rhncfg-client diff

To quickly determine if client configuration files are different than those associated with it via RHN, issue the command:

rhncfg-client verify

To View config channels

rhncfg-client channels

Disclaimer: The views expressed and the content shared are those of the author and do not reflect the views of the author's employer or techbeatly platform.


Gineesh has worked as a Systems Engineer, Automation Specialist, and content author. His primary focus is on Ansible Automation, Containerisation (OpenShift & Kubernetes), and Infrastructure as Code (Terraform). (aka Gini Gangadharan -


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