CentOS7 is finally here! In this guide, I will take a quick look at how you can change the hostname in CentOS

Step 1: Check Your Current Hostname

Enter this into the shell:

hostname

You will get back something like host.domain.com, where domain is your assigned root domain that is usually used to set up your initial nameservers (if you are using WHM or Plesk, you are probably used to that)

Step 2: Backup Hosts and Network Files

If you are new to CentOS and have never edited the hostname before, it is a good idea to backup the following files first. Copy and paste this command

cp /etc/hosts /etc/hosts.bak
cp /etc/sysconfig/network cp /etc/sysconfig/network.bak

Step 3: Modifying Hosts File

My favorite editor is pico, so I will use that for this example:

pico /etc/hosts

Next, modify the line that looks similar to host.domain.com and replace only that

Modifying Centos Hostname

Step 4: Modifying Network File

pico /etc/sysconfig/network

Modifying Sysconfig Hostname

Step 5: Execution

Finally, we are going to change the hostname and restart the network service by executing two lines:

hostname host.webmaster.net

and

service network restart

This is what you should get:
Service Network Restart

Step 6: Confirmation

You can now confirm that you hostname has been changed by executing the command hostname again.

VoilĂ , you have successfully rendered your hostname to a different alias.

Troubleshooting

If you’re still having problems with your hostname, make sure to clear all caches within your control panel.

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