Changing the hostname in Linux depends on your distribution and whether you're using **systemd** (most modern distros do).
1. Check Current Hostname
[root@test ~]# hostnamectl status
Static hostname: test.localdomain
Icon name: computer-vm
Chassis: vm
[root@test ~]# date
Thu Aug 14 15:53:54 +04 2025
[root@test ~]# uptime
15:53:56 up 1 min, 1 user, load average: 2.46, 0.70, 0.24
2. Change Hostname (Permanent)
Using `hostnamectl` (Recommended for systemd-based systems like Ubuntu, CentOS 7+, RHEL 7+, Debian 9+)
sudo hostnamectl set-hostname new-hostname
[root@test ~]# hostnamectl set-hostname muthu.org
> Replace `new-hostname` with your desired name.
3. Update `/etc/hosts`
Edit the file:
sudo nano /etc/hosts
[root@test ~] vi /etc/hosts
Find the line like:
127.0.1.1 old-hostname
And change it to:
127.0.1.1 new-hostname
This ensures local name resolution works properly.
4. Reboot or Re-login
Although the change is immediate, some services may require a reboot:
sudo reboot
[root@test ~]# reboot
