The role and practical application of host names in Linux systems

The role and practical application of the host name in the Linux system

In the Linux system, the hostname (hostname) is an extremely important concept, which is used to identify the network A host (computer) in . Hostnames are usually unique and can be used to identify different computers on a network. The setting of the host name has practical significance and can also improve the convenience of system management.

Function and meaning

1. Network identification: The host name is the identification of each host in the network. The host name can be used to locate and access a specific machine.
2. System Management: In the Linux system, the host name is part of the system configuration, involving network communication, service access and other functions. By setting and managing hostnames, you can better manage your hosts.
3. Shell prompt: The host name is usually displayed in front of the terminal command prompt to facilitate users to identify the current host.

Practical application

View and modify the host name

In the Linux system, you can use the following commands to view and modify the host name:

1. View host name

   hostname

2. Temporarily modify the host name

   hostname <new_hostname>

3. Permanently modify the hostname

   • ##Debian/Ubuntu

     In the

     /etc/hostname file Edit the host name in:

     sudo nano /etc/hostname

     Then restart the system or execute the following command to make the modification effective immediately:

     sudo hostnamectl set-hostname <new_hostname>

   • CentOS/RHEL

     Also edit the host name in the

     /etc/hostname file and execute the following command:

     sudo hostnamectl set-hostname <new_hostname>
     sudo systemctl restart systemd-hostnamed

Host name and hosts file

The host name is also closely related to the system's

/etc/hosts file. This file is mainly used to resolve the relationship between host names and IP addresses locally. In this file, you can manually add the mapping between host names and IP addresses to facilitate local host name resolution.

For example, add a line in the

/etc/hosts file:

127.0.0.1    myhostname

In this way, when

myhostname is requested locally, the system will automatically resolve it The address is 127.0.0.1.

Summary

The host name in the Linux system plays an important role in network communication and system management. By properly setting and managing host names, each host can be easily identified and managed, and the stability and maintainability of the system can be improved. At the same time, combined with the configuration of the

/etc/hosts file, the mapping of host names and IP addresses can be more flexibly performed.

Through the above introduction, I believe that readers have an understanding of the role and practical application of host names in Linux systems. I hope it will be helpful to everyone in using Linux systems.

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