How to Change Hostname in Rocky Linux 9

Displaying the Current Hostname

Find out the hostname of your system by using the below command,

hostnamectl

Output:

[root@server ~]# hostnamectl
   Static hostname: n/a
Transient hostname: server
         Icon name: computer-vm
           Chassis: vm 
        Machine ID: 20b5506b9d87493f872d80205d51b9cc
           Boot ID: 5d8f3e5d6a104727ae51be1fab078e0c
    Virtualization: kvm
  Operating System: Rocky Linux 9.0 (Blue Onyx)
       CPE OS Name: cpe:/o:rocky:rocky:9::baseos
            Kernel: Linux 5.14.0-70.13.1.el9_0.x86_64
      Architecture: x86-64
   Hardware Vendor: Red Hat
    Hardware Model: KVM

Changing the System Hostname

Now that you know the current hostname, you can change the hostname by using the following command, and Optionally you can also set the pretty hostname as follows.

hostnamectl set-hostname crowncloud.net

hostnamectl set-hostname "crowncloud production server" --pretty

Next, add the record for the hostname in the /etc/hosts file.

127.0.0.1 crowncloud.net

Edit the file using your favorite editor.

nano /etc/hosts

After you've added/edited the file, save and exit the file.

Output: 

[root@server ~]# cat /etc/hosts
127.0.0.1 crowncloud.net

This will also add an entry to the /etc/hostname file automatically.

Restart the systemd-hostnamed service.

systemctl restart systemd-hostnamed

Alternatively Set or Change Hostname using NMTUI

Alternatively, you can set or change the hostname of your system using NetworkManager's Text User Interface. Run the following command and follow the steps as shown below,

nmtui

Select set system hostname.

image

Enter the new hostname.

image

Restart the systemd-hostnamed service.

systemctl restart systemd-hostnamed

Verify the Change

To verify the hostname has been fully changed, enter the hostnamectl command.

[root@server ~]# hostnamectl
 Static hostname: crowncloud.net
 Pretty hostname: crowncloud production server
       Icon name: computer-vm
         Chassis: vm 
      Machine ID: 20b5506b9d87493f872d80205d51b9cc
         Boot ID: 5d8f3e5d6a104727ae51be1fab078e0c
  Virtualization: kvm
Operating System: Rocky Linux 9.0 (Blue Onyx)
     CPE OS Name: cpe:/o:rocky:rocky:9::baseos
          Kernel: Linux 5.14.0-70.13.1.el9_0.x86_64
    Architecture: x86-64
 Hardware Vendor: Red Hat
  Hardware Model: KVM