Register in RHN after installation

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

Manul 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 
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

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