@satishjan1 The initial question is asking about setting the hostname.   The information you reference is telling you to do that, but for a different operating system.  My first response was telling you how to do it for RHEL.     For your next question,  you do not have to set the hostname in /etc/sysconfig/network,  you have to do it the way required for your operating system.  See Above.   The hostname must be set, and persist after reboot.      If you do not set the hostname before installing the cluster you will have unmentionable problems with services and components later on down the road. ... View more