uname -n 

Configuring /etc/hostsIf your IP address is assigned to you by a DHCP server, then /etc/hosts is configured as follows: 

127.0.0.1	mybox.mydomain.com	localhost.localdomain localhost mybox

If you have a static IP address, then /etc/hosts is configured as follows: 

127.0.0.1	localhost.localdomain localhost 192.168.0.10	mybox.mydomain.com	mybox

Setting the Host Name using “hostname”

After updating the /etc/hosts file correctly, the “hostname” command should be run as follows to set your hostname: 

hostname mybox.mydomain.com

Checking /etc/HOSTNAME (if present)

You may or may not have the file /etc/HOSTNAME: 

mybox.mydomain.com

Checking /etc/sysconfig/network

If you have a static IP address, then /etc/sysconfig/network is configured as follows: 

NETWORKING=yes HOSTNAME="mybox.mydomain.com" ...

Checking /proc/sys/kernel/hostname

This is checked with the following command: 

cat /proc/sys/kernel/hostname

If you need to set this file, you can either reboot or set it now with the following command: 

echo mybox.mydomain.com > /proc/sys/kernel/hostname 
: courtesy: cpqlinux.com