How to Change the Hostname on Linux CentOS 6.3 Server

Taken from - http://vjetnamnet.com/how-to-change-the-hostname-on-linux-centos-6-3-server/

In this post, i will show you on how to change the Hostname on linux CentOS 6.3. I have tested this on RHEL 6, CentOS 5.5 and CentOS 6.2.  and Centos 6.3. Reboot is required for both options (A) and (B) for the changes to take effect.

Check current hostname with this command :

# hostname --fqd

centos62.ehowstuff.local

Option A:
1. Modify /etc/sysconfig/network

# vi /etc/sysconfig/network

2. Edit to your preferred hostname :

NETWORKING=yes   HOSTNAME=server.vjetnamnet.local

3. Modify /etc/hosts file as below :

# vi /etc/hosts   127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4   ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6   192.168.1.44 server.vjetnamnet.local server

4. Save and reboot your server.

Option B:
1. Type the following command to enter GUI mode.

# system-config-network

2. Go to “DNS Configuration”.

3. Modify your preferred hostname and click OK.

4. Click ” Save & Quit”.

5. Modify /etc/hosts file as below :

# vi /etc/hosts   127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4   ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6   192.168.1.44 server.vjetnamne.local server

6.Reboot your server.