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

This is post for those who 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