Linux change hostname or system name

This post will guide you how to change your hostname or computer system using the command line under linux operation system. If you are using a ubuntu Linux system, and how to change your hostname or the machine name under command line option.

You can use the HOSTNAME command or HOSTNAMECTL command to acieve the result. You can also use those two commands to set or display the current hostname or domain name of your system. the hostname of your system can be used by other linux programs to identify this machine, such as: networking program.

Display Hostname

you can directly execute the hostname command to get the name of the system under command line option, type the following command:

#hostname

Outputs:

devops-osetc.com

Change Hostname

if you want to change the current hostname of your system, you can also use the hostname command. For example, if you want to set the current hostname as devops-osetc-new.com, type the following command:

#hostname devops-osetc-new.com

Change hostname permanently

if you want to change hostname permanently on your linux system, you need to change the hostname config file /etc/hostname, just do the following steps:

#1 edit the config file /etc/hostname with vi/vim command, type:

#vi /etc/hostname

#2 add new hostname into the config file, just like this line:

devops-osetc-new.com

#3 save and close the config file. then reboot the system.

Note: if you do not want to reboot system, and you need to run the below command:

#/etc/init.d/hostname.sh start

Change hostname using HOSTNAMECTL command

You can also use the hostnamectl command to change or set the hostname of your system under command line option.

Display Current Hostname

if you want to get the current hostname with hostnamectl command, just execute the following command:

#hostnamectl

Change hostname with hostnamectl command

if you want to change the hostname with hostnamectl command , just type the following command:

# hostnamectl set-hostname devops-osetc-new.com

Remove hostname with hostnamectl

if you want to remove the specific hostname and change its as default hostname, just type the following command:

#hostname set-hostname ""