The Fastest Guide to Changing Hostname on AlmaLinux! Easy Steps for Beginners

Introduction

Do you think changing a hostname sounds complicated? Actually, it is very easy to configure on AlmaLinux. Setting an appropriate hostname improves system manageability and helps avoid trouble in network environments.

In this article, I will explain how to change the hostname simply and effectively. I will provide concrete examples so that even Linux beginners can understand and practice it in a short time. Now, let's change the hostname cleanly with these easy steps!

How to check the hostname

First, let's check the current hostname. There are several ways to check it.

1. Using the hostname command

hostname

This simply displays the current hostname.

2. Using the hostnamectl command

hostnamectl

In addition to the current hostname, you can also check the status information of the host.

3. Checking the /etc/hostname file

cat /etc/hostname

This directly displays the file where the hostname is set.

How to change the hostname

Now, let's move on to the specific change methods. Here, I will introduce three main methods.

1. Changing with the hostnamectl command

This is the most recommended method. Just enter the following command to complete it:

sudo hostnamectl set-hostname 新しいホスト名

2. Editing the /etc/hostname file

1. Open the file with a text editor:

   1. sudo nano /etc/hostname

2. Delete the current hostname and enter the new hostname.

3. Update /etc/hosts as well, and replace the old hostname with the new one:

   1. sudo nano /etc/hosts

3. Changing with the nmcli command

This is how to set the hostname using NetworkManager.

sudo nmcli general hostname 新しいホスト名

Verification after changing the hostname

Once you have changed the hostname, let's verify that it has been applied.

1. Verify with hostname:

   1. hostname

2. Verify with hostnamectl:

   1. hostnamectl

3. Reboot if necessary:

   1. sudo reboot

Recommended options for VPS users

Setting the hostname is especially important for users who use a VPS. Here, we introduce two VPS services that are optimal for configuration.

1. LightNode

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2. ConoHa VPS

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Points of caution and tips

Please note the following when changing the hostname:

• RFC 1123 Compliance: Use only letters, numbers, and hyphens for hostnames, and avoid spaces or special characters.

• DNS Record Updates: After changing the hostname, please update your DNS records as necessary.

• SSH Configuration: After the change, your SSH settings and authentication credentials may be affected.

Conclusion

Wasn't changing the hostname easier than you thought? Please try it out by following the steps introduced in this article. In particular, properly setting the hostname in a VPS environment is the first step toward efficient network management.

If you want to read more Linux-related articles, learn more on the OneDollar tag page!