As user “root”
“vi /etc/sysconfig/network”, change HOSTNAME value to the new hostname
“hostname NEW_HOST_NAME” to change it for the current sessions
“vi /etc/hosts”, change the old value to point to the new hostname
“service network restart” to restart the networking service and apply all the new changes
Just Some Techie Notes! 
There are no host names in /etc/hosts except localhost in default Oracle Linux installation. So /etc/sysconfig/network is enough
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I login as root and “vi /etc/sysconfig/network ” but it doesn’t show the hostname after I restart. it show none. Please help in this.
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