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Debian 12 Bookworm Host Name Modification Guide
In the world of network-connected computers, each device needs a unique identifier—the host name—to distinguish different devices. Whether you are working on a large enterprise network or just operating on a personal Linux system, you may need to change the hostname. This guide will detail how to change the hostname in the latest version of Debian 12 Bookworm, the popular Linux distribution.
Preparation
Before you begin, make sure you meet the following conditions:
Explanation of terms
To ensure that we understand consistently, let's clarify some terms:
Backup the current settings
Backing up important configurations is always a prudent approach before making any changes. Open the terminal and run:
cp /etc/hostname /etc/hostname.bak cp /etc/hosts /etc/hosts.bak
This will create a backup copy of the current hostname and hosts file.
Method 1: Use the hostnamectl command
Step 1: Check the current host name
To view the current host name, run the following command:
hostnamectl
Step 2: Change the host name
To change the hostname, execute:
sudo hostnamectl set-hostname new hostname
Replace "New Host Name" with the host name you want. For example, to change the hostname to "mydebian", you will run:
sudo hostnamectl set-hostname mydebian
Step 3: Verify the changes
Use the hostnamectl command again to check whether the hostname has been updated:
hostnamectl
Method 2: Manually edit the configuration file
Step 1: Open /etc/hostname file
Open the /etc/hostname file using a text editor (such as nano):
sudo nano /etc/hostname
Step 2: Edit the host name
In the text editor, you will see the current hostname. Delete and replace it with your new hostname, then save and exit.
Step 3: Open and edit the /etc/hosts file
Similarly, open the /etc/hosts file:
sudo nano /etc/hosts
Find the line that starts with 127.0.1.1 and is followed by the old host name. Replace the old hostname with the new hostname, save and exit.
Step 4: Apply changes
After making these changes, apply them using the following command:
sudo systemctl restart systemd-hostnamed
Step 5: Verify the changes
To check if the hostname has been changed successfully, run:
hostnamectl
Frequently Asked Questions
Host Name Not Updated: If you find that the host name is not Updated immediately, a system restart can usually resolve this issue:
sudo reboot
Network Service Issue: After changing the hostname, you may find that some network-related services are running abnormally. Restarting the network service usually solves this problem:
sudo systemctl restart networking.service
Summarize
You have now mastered two different ways to change the hostname in Debian 12 Bookworm: using the hostnamectl command and manually editing the configuration file. While the hostnamectl method is faster and easier, understanding the configuration file gives you a deeper understanding of how Linux systems work.
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