How to change Hostname of a Linux server

Steps

1) Run command: hostname to check the current hostname

To set new hostname Run below Command

hostname new_server_name

2) Modify the hostname in file: /etc/sysconfig/network

vi /etc/sysconfig/network

3) Modify the hostname in file: /etc/hosts

vi /etc/hosts

Output Will be like 

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
Your-Server-IP   Host-Name 

4)Run the command  service network restart