Change a Server Hostname in CentOS

  • Last updated on: 2016-01-13
  • Authored by: Rackspace Support

By default, your server is started with the server’s given name as the hostname. Some software, such as cPanel, requires a valid Fully Qualified Domain Name (FQDN) for the hostname to be used during their licensing verification system. This article describes how to change a server hostname in CentOS.

Change a server hostname

  1. Using a text editor, open the /etc/sysconfig/network file.
  2. Modify the HOSTNAME= value to match your FQDN hostname.

    # sudo nano /etc/sysconfig/network
    HOSTNAME=myserver.domain.com
    
  3. For internal networking, change the host that is associated with the main IP address for your server, (found at /etc/hosts).

    hosts.png

  4. Run the hostname command. This command lets you change the hostname on the server that the command line remembers, but it does not actively update all programs that are running under the old hostname.

    hostname.png

  5. Restart networking on your server to ensure that changes will persist on restart.

    # /etc/init.d/network restart
    

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