RHEL 8 Change Hostname (computer name) command

I am a new RHEL 8 user and setup a server. They setup my server name to ‘localhost’ during deployment but now I would like to change the computer name to something else. How can I remove old name and set it to ‘nixcraft-rhel8’ on Red Hat Enterprise Linux? Can you tell me how do I change the RHEL 8 computer name? How do I assign a static hostname to server running RHEL 8?

Introduction : For RHEL 8 you can use the hostnamectl command to change the hostname of an RHEL 8 server, laptop or desktop. You can use the hostname command to see or set the system’s hostname too. The hostname or computer name is usually at system startup in /etc/hostname file. Open the terminal application and type the following command to change the hostname on RHEL 8.

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Display the current RHEL 8 hostname

Type any one of the following command including the cat command:
$ cat /etc/hostname
OR
$ hostname
OR
$ hostnamectl
RHEL 8 show or display current hostname

RHEL 8 change hostname command

The procedure to change the computer name on Red Hat Linux:

  1. Type the following command to edit /etc/hostname using nano or vi text editor:
    sudo vi /etc/hostname
  2. Delete the old name and setup new name.
  3. Next Edit the /etc/hosts file:
    sudo vi /etc/hosts
  4. Replace any occurrence of the existing computer name with your new one.
  5. Reboot the system to changes take effect:
    sudo reboot

How to change the RHEL 8 server hostname without a system restart

Type the following commands:
$ sudo hostname nixcraft-rhel8
Next edit the /etc/hostname file and update hostname:
$ sudo vi /etc/hostname
Finally, edit the /etc/hosts file and update the lines that reads your old-host-name:
$ sudo vi /etc/hosts
From:
127.0.1.1 localhost
To:
127.0.1.1 nixcraft-rhel8
Save and close the file.

A note about hostnamectl command

Systemd based Linux distributions such as RHEL 8 can simply use the hostnamectl command to rename hostname. To see current setting just type:
$ hostnamectl
Sample outputs:

   Static hostname: localhost
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 2f23e83aad5d413498ef79742ad660eb
           Boot ID: c3c158618d54451f82f3cee23471248d
    Virtualization: kvm
  Operating System: Red Hat Enterprise Linux 8.0 Beta (Ootpa)
       CPE OS Name: cpe:/o:redhat:enterprise_linux:8.0:beta
            Kernel: Linux 4.18.0-32.el8.x86_64
      Architecture: x86-64

To change hostname from linux-mig6 to suse-rhel8, enter:
$ sudo hostnamectl set-hostname nixcraft-rhel8
$ hostnamectl

How to set or change RHEL 8 server hostname

Set or change RHEL 8 server hostname using the hostnamectl command

Conclusion

On RHEL 8 one can use the hostnamectl command to control the system hostname and set a new name as well. This is recommended method for all RHEL 8 users.

This entry is 15 of 19 in the Linux/Unix Set hostname Tutorial series. Keep reading the rest of the series:
  1. Ubuntu Linux Change Hostname (computer name)
  2. Debian Linux: Change Hostname / Computer Name Permanently
  3. Linux change my hostname / computer system name
  4. Linux Change Hostname
  5. RHEL / Centos Linux 7: Change and Set Hostname Command
  6. OpenBSD Change Hostname
  7. CentOS Linux 5/6 Change Hostname Command
  8. Linux setting hostname and domain name of my server
  9. FreeBSD Change Hostname without reboot
  10. SuSe Linux Change Hostname without reboot
  11. How to set the hostname on Fedora Linux
  12. Ubuntu 18.04 LTS change hostname permanently
  13. Ubuntu set hostname permanently (computer name) command
  14. OpenSUSE Linux set hostname permanently (computer name) command
  15. RHEL 8 Linux set hostname permanently (computer name) command
  16. CentOS 8 Linux set hostname permanently (computer name) command
  17. Ubuntu 20.04 LTS set hostname permanently (computer name) command
  18. Set / Change FQDN on Ubuntu 20.04 LTS
  19. Alpine Linux - Setting system hostname

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