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Changing Linux system Hostname. Hostname is the

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name of your Linux machine that is assigned during

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the first install. And often times, a machine is

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repurposed or decommissioned, or used for

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something else, then you have to change its hostname.

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To change the hostname, the command that is used is

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hostnamectl - set-hostname newhostname.

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This is the command, I believe there is no dash in the middle. But I'll

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try it out hostnamectl set-hostname newhostname

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The files that are used

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to save the newhostname in Linux 7 OS

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version, it's etc/hostname, the older version

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of Linux, which was version six, the configuration

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file for hostname was /etc/sysconfig/network.

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So again, let's try are changing our hostname of

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our Linux machine in our lab environment, or Linux

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machine, and right now when you type hostname,

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this is the name of our machine MyFirstLinuxOS.

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Now I want to change this hostname to a different

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hostname because my company came up with a new

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standard. Now every machine has to comply with the

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new standard requirement. So that's why I want to

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change it. So in order to change a hostname, you

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have to first become root, because root is only the

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one who has the power to do that. Okay, I'm going

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to login as root. Alright, and now I'm going to

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run the command hostname. Before I run this

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command, I just wanted to tell you, that the file that

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keeps your hostname information is /etc/

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[Author typing]

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hostname.

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If you see, when I cat this file, it has

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my hostname. I could go into this file directly and

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modify this hostname and then reboot the system

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and it work or I could just simply run hostname

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ctl command, set-hostname, and the new hostname, so

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I'll put it the new hostname

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[No audio]

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nyc,

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host1, let's say, because my machine is located

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in New York City, and this the number one host so

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I'm just you know making it up to comply with

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the standard my company came up with. Alright,

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perfect. So once I have it, I run the command, it

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ran. So now when you do cat /etc/hostname, you

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should see the new hostname there. Yes, you see

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that. nychost1, but when you type hostname,

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it gives you the hostname of your new machine.

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But if you notice here your prompt, MyFirstLinuxOS,

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has, your prompt has the old hostname.

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Why is that? Because this shell that I'm logged

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into, this shell has to be restarted or the whole

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system has to reboot in order to read the new hostname

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that we created. So the only way to do that

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is simple reboot. So I'll just run reboot or

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another command for reboot is init6. So

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this time I'll run init 6, and we'll wait for the

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system to come back online. Give it a couple of minutes.

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Got my login prompt, I'll login.

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Some time the virtual machine will take a little

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longer to come back online depending on your

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laptop speed. So I'm going to go and right click,

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Open Terminal,

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and you'll see now it has the new hostname.

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[No audio]

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nychost1, so this is how you change the hostname.

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Do you guys know how to change the hostname in

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Windows? Well I think you might. If not, then you

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should look into it. Because as administrator you

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will have to work a little bit of in the Windows

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environment too.You just go into your My Computer,

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right click on Properties, and change the hostname.

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So it is simple in Windows through the GUI, in

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Linux it is just running one command. It's simple

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here as well. So I'm going to change it back to

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my original hostname, becoming root. So this

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will stay consistent and this time I'll just

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modify the /etc/hostname file.

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[No audio]

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MyFirstLinuxOS, right, this is my original hostname.

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And when you run hostname this time, it will

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still give you that because the process that

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does the hostname changes, that process hasn't

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been restarted. The only way to do it is to

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restart like hostname, the command that we run

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before, but anyway, I'm just going to simple go

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ahead and restart or reboot my computer again, so

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the changes will take place and put my system back

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to my original hostname.

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