What is the Hostname?

Briefly, a hostname is a unique name for a computer or network connection on a network. This name is a string of characters that help identify a computer on the network. It must be unique since there may be packet loss and some services may not work properly.

In other words, the hostname allows you to distinguish between devices on a local network. Besides, it allows computers to locate others, making it possible to exchange data within a network.

On the other hand, the hostname is used on the Internet as part of the Fully Qualified Domain Name that should not be confused.

But the aim of this post is that we learn how to change it in Ubuntu.

Change the Hostname in Ubuntu

In this tutorial, we will use the terminal. This is so that you can take advantage of it both on a server and your desktop system.

So, open your terminal or start an SSH session. If you use the GNOME interface you can open a terminal by pressing the keys CTRL + ALT + T

Then, check what your hostname is. To do this, run it:

hostname

You will get a simple output where you will see the hostname.

If you want a little more information related to the hostname you can use the command hostnamectl

hostnamectl
Static hostname: laptop
Icon name: computer-laptop
Chassis: laptop
Machine ID: 16fa2990e5014c52bbca62e8a9eb3558
Boot ID: 25860d46c0c94da5a8a5a344a237d81f

Now, you know what the hostname is in your system, it’s time to change it.

The easiest and most practical way is to use the hostnamectl command. To change it, follow this syntax:

sudo hostnameclt set-hostname [new-hostname]

For example:

sudo hostnameclt set-hostname osradar

And it’s that simple. Check the hostname command again and you will see the change reflected.

Change the Hostname in Ubuntu permanently

The above method is temporary. This means that when the computer is restarted, the changes will be reversed. To make the change permanent, you have to do the previous step but another one.

After you’ve changed the hostname with the previous command open the file /etc/hosts and replace any indication of the old hostname with the new one.

sudo nano /etc/hosts

Then, save the changes and reboot the system.

Now the change has been permanent.

Conclusion

Changing the hostname is quite easy but for many it can’t waste any time. So this is important to know and keep in mind for daily work.

So, please share this post and join our Telegram Channel.

The post How to change the hostname on Ubuntu? appeared first on Linux Windows and android Tutorials.

My server:

suse15:~ # uname -a
Linux suse15 4.12.14-lp150.8-default #1 SMP Sat Apr 7 05:12:52 UTC 2018 (8719fc4) x86_64 x86_64 x86_64 GNU/Linux

IP: 192.168.65.151
Hostname:  suse15
Domain name:  osradar.com.

The actual info:

Change hostname procedure :

The procedure to change the computer hostname on openSuse Linux:

Type the following command to edit /etc/hostname using your preferred text editor:
sudo vi /etc/hostname
Delete the existing name and put a new name.
Now Edit the /etc/hosts file:
vi /etc/hosts
Replace any name related to the existing computer name with your new one.

Reboot the system to changes take effect
sudo reboot

Using hostingctl command

hostingctl is   a command from where you can change  the hostname  also  with the following commands:

hostnamectl set-hostname  suse15

Using  Yast2

Yast2 us  GUI tool  to  manage your  server/desktop

Start Yast2 with
# sudo yast2

Then NetworkServices > Hostnames > and  change hostname related to your  IP address

Restart rcnetwork services.

osradar@suse15~> sudo rcnetwork restart

How to verify? 

Please reboot for the final check and enjoy

The post Change hostname in opensuse Leap appeared first on Linux Windows and android Tutorials.