How to correctly configure a Linux hostname

Title: How to correctly configure the Linux host name, specific code examples are required

In the Linux system, the host name is the unique name that identifies a computer on the network. Correctly configuring the host name not only helps us manage the host more conveniently, but also improves network security. The following will introduce how to correctly configure the Linux host name and give specific code examples.

1. View the current host name
   In the Linux system, we can use the hostname command to view the current host name. Enter the following command in the terminal:

   hostname

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2. Modify the host name
   a. Temporarily modify the host name
   If we just want to temporarily modify the host name, we can use the following command:

   sudo hostname new_hostname

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   This command will immediately modify the host name, but will revert to the original host name after restarting.

   b. Permanently modify the host name
   To permanently modify the host name, we need to edit the /etc/hostname file. Open the editor with the following command:

   sudo nano /etc/hostname

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   In the opened file, modify the original hostname to the new desired hostname and save and exit.

3. Configuration host file
   Host file/etc/hosts is used to map IP addresses and host names. After modifying the hostname, we need to update the hosts file. Use the following command to edit the host file:

   sudo nano /etc/hosts

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   After opening the file, add the following content on the first line:

   127.0.0.1    new_hostname

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   Replace new_hostname with your modified hostname, Then save the file and exit the editor.

4. Restart the network service
   After modifying the host name, we need to restart the network service for the change to take effect. Use the following command to restart the network service:

   sudo systemctl restart networking

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   or

   sudo systemctl restart NetworkManager

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5. Verify whether the host name modification is successful
   Reopen the terminal and use the hostname command to check the host name Whether the modification has been successful.

Through the above steps, we can correctly configure the Linux host name and implement it through specific code examples. Remember to back up relevant files before modifying the host name to avoid system failure caused by operational errors. Hope this article is helpful to you.

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