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CentOS Linux 5/6 Change Hostname Command

I am a new CentOS Linux server user. How do I change hostname on CentOS Linux? How can I change server hostname on CentOS Linux version 5 or 6?

You need to use the following commands to set or view current hostname, domain name and/or FQDN (Fully Qualified Domain Name):
  1. dnsdomainname command : Display the system's DNS domain name.
  2. hostname command : Show or set the system's host name.

You also need to edit the following files for a hostname change:

  1. /etc/sysconfig/network file.
  2. /etc/hosts file.

In this tutorial, I will show you how to set/change a server hostname in CentOS Linux to "server1.cyberciti.biz". CentOS / RHEL version 7.x users, see this page for more info.

Display current hostname

Type the following command:
# hostname
Sample outputs:


To display current domain name:
Type the following command:
# dnsdomainname
Sample outputs:


Hostname change procedure on CentOS

Open the terminal or login to the remote server using ssh client. Edit /etc/sysconfig/network file, enter:
# vi /etc/sysconfig/network
Find and modify HOSTNAME value to set to FADN such as server1.cyberciti.biz:


Save and close the file.

Edit hosts file

Edit /etc/hosts file, enter:
# vi /etc/hosts
You need to set or change the host that is set to your IP address on server. localhost server1.cyberciti.biz server1  # Added by nixCraft

Save and close the file.

Set hostname manually without rebooting the box

Type the following command:
# hostname server1.cyberciti.biz

Restart the CentOS networking and other services (if any)

You need to restart the networking service on CentOS Linux, enter:
# service network restart
# /etc/init.d/network restart

Verify new hostnames

Simply type the following commands:
# hostname
# dnsdomainname

See also

{ 1 comment… add one }

  • Joro March 21, 2015, 11:34 am

    Hey pal,

    Why are you restarting the network at all?!

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