Changing your server's hostname is a routine but important system administration task. Your hostname is used to identify the server on a network, and in hosting environments like cPanel, it must be set correctly for licensing and email services to work properly.

Step 1: Change the Hostname (Temporarily)

Run the following command as root or with sudo:

hostname servername.yourdomain.com

To verify the change:

hostname
hostnamectl status

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Step 2: Set the Hostname Permanently

For Systemd-based Systems (CentOS 7+, RHEL 7+, Ubuntu 16.04+):

hostnamectl set-hostname servername.yourdomain.com

For CentOS 6 or older:

vi /etc/sysconfig/network

Set or modify:

HOSTNAME=servername.yourdomain.com

Also update /etc/hosts:

127.0.0.1   servername.yourdomain.com servername

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For Debian/Ubuntu:

sudo nano /etc/hostname

Replace with:

servername.yourdomain.com

sudo nano /etc/hosts

127.0.1.1   servername.yourdomain.com servername

Step 3: Resync cPanel License

If you’re running cPanel/WHM, run:

/usr/local/cpanel/cpkeyclt

Optional: Update Hostname in WHM

Go to: WHM → Networking Setup → Change Hostname

Additional Recommendations

• Ensure Reverse DNS (PTR) record matches your new hostname.
• Regenerate SSL certificates if hostname is used in services like mail/WHM.
• Update hostname in your monitoring/logging systems.

Summary