# hostname
prod-server

1. Modify the /etc/hosts file

If you have entries in the /etc/hosts file with the old hostname, you should modify it.

For example, the entry for 127.0.0.1 line in the /etc/hosts file will still show the old hostname. In this example, it shows as dev-server.

$ cat /etc/hosts
127.0.0.1  dev-server localhost.localdomain localhost

Modify this file, and set the new hostname here. For example, change dev-server to prod-server as shown below.

$ cat /etc/hosts
127.0.0.1  prod-server localhost.localdomain localhost

1. Modify the /etc/sysconfig/network file

The /etc/sysconfig/network file also has an entry for HOSTNAME. Change the value here as shown below.

# cat /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=prod-server

1. Restart the Network

Restart the network service, if you want any other services that are using the hostname to pickup the changes.

# service network restart
Shutting down interface eth0:        [  OK  ]
Shutting down loopback interface:   [  OK  ]
Bringing up loopback interface:     [  OK  ]
Bringing up interface eth0:          [  OK  ]

If its still not work than restart the system than in startup it will set.

Hope this will help

Regards,

Anil R.K. (SerpentCS)