change hostname

On Ubuntu:

1. Press Ctrl+Alt+T on keyboard to open the terminal. When it opens, run the below command:

hostname NEW_NAME_HERE

This will change the hostname until next reboot. The change won’t be visible immediately in your current terminal. Start a new terminal to see the new hostname.

2. To change the name permanently, run command to edit the host files and change the name.And restart the machine after that:

sudo gedit /etc/hostname /etc/hosts

Reference


One more approach working on CentOS: Reference

hostnamectl set-hostname your-new-hostname

In addition to hostname command you can also use hostnamectl command to display a Linux machine hostname.

# hostnamectl

In order to apply the new hostname, a system reboot is required, issue one of the below commands in order to reboot a CentOS 7 machine.

# init 6
# systemctl reboot
# shutdown -r