How to change hostname on Linux (Red Hat or Oracle)

This is post for those who are new to Red Hat Linux or Oracle Enterprise Linux (OEL) and wish to change hostname :-

.

#. How to find hostname on Linux/OEL ?

     Use command “hostname” to find host name of Linux

 

#. How to change hostname on Linux/OEL ?

1. Open file /etc/sysconfig/network  using editor like vi , nano or ed
2.  Change entry HOSTNAME=XXXXXX to
   HOSTNAME=New_Host_Name
3. Restart xinetd service or reboot Linux/OEL
   Restart xinetd service xinetd restart
   Reboot Linux reboot
4. If you have defined hostname resolution in hosts file then change entry in /etc/hosts