Home Operation and Maintenance Linux Operation and Maintenance Detailed explanation of the file description of /etc/host* in Linux system services (1)

Detailed explanation of the file description of /etc/host* in Linux system services (1)

Jun 06, 2017 am 10:39 AM

1./etc/hosts

>man hosts


1. Function: Host name query Static table; mainly used for conversion between IP address and computer host name.

/ETC/HOSTS file format, each line represents an IP address; each line consists of three parts:

ip_address canonical_hostname The host name or domain name of #ip address specifications

# Note:

(1)

Note

## 内容#(2) Host Names is only only It can contain numbers, letters, hyphens (-), and dots (.); it must start with a letter and end with a letter or number. (3) Host name alias is optional

(4) Although the host table has been replaced by DNS, it is still widely used:

--System boot: Most systems have a small host table, which contains the names and address information of important hosts in the local network. This is useful when DNS is not enabled.

--NIS: Websites that use NIS will use the host table as the input to the NIS host database. Even if NIS uses DNS, most NIS websites still use the host table as the backup entry for all local hosts. --Isolated node: In a LAN that is not connected to the internet, the host table will be used as a replacement for DNS. If the local information rarely changes, and the local LAN is not connected to the Internet, DNS has no advantage.

The above-mentioned isolated node means that when establishing a LAN without a connection to the Internet, you can use /etc/hosts to specify the mapping between the host name and IP that needs to be connected. Those that are not included in the /etc/hosts mapping , generally unable to connect.

(5) Modifications to this file usually take effect immediately unless this file is cached.

2. Example

Note:

After entering the IP and its host name in /etc/hosts, you can use the host name for LAN

Remote login

or connect, it is faster;2./etc/hostname This file can only contain the host name

The way to permanently modify the host name is to modify /etc/hostname, which will take effect after restarting;

Temporary modification: You can use hostname new-host-name in the terminal to make temporary changes Once the system is restarted, the hostname will be changed back to the original one.

3./etc/host.conf1. There are two methods for domain name resolution:

(1) Use DNS system

(2) Use the /etc/hosts file

/etc/host.conf to specify the order of domain name resolution methods.

The general content is:

##order: Specify which order to use.

hosts: Use /etc/hosts file resolution

bind: Use DNS resolution.

The above is the detailed content of Detailed explanation of the file description of /etc/host* in Linux system services (1). For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What computer configuration is required for vscode What computer configuration is required for vscode Apr 15, 2025 pm 09:48 PM

VS Code system requirements: Operating system: Windows 10 and above, macOS 10.12 and above, Linux distribution processor: minimum 1.6 GHz, recommended 2.0 GHz and above memory: minimum 512 MB, recommended 4 GB and above storage space: minimum 250 MB, recommended 1 GB and above other requirements: stable network connection, Xorg/Wayland (Linux)

How to run java code in notepad How to run java code in notepad Apr 16, 2025 pm 07:39 PM

Although Notepad cannot run Java code directly, it can be achieved by using other tools: using the command line compiler (javac) to generate a bytecode file (filename.class). Use the Java interpreter (java) to interpret bytecode, execute the code, and output the result.

vscode cannot install extension vscode cannot install extension Apr 15, 2025 pm 07:18 PM

The reasons for the installation of VS Code extensions may be: network instability, insufficient permissions, system compatibility issues, VS Code version is too old, antivirus software or firewall interference. By checking network connections, permissions, log files, updating VS Code, disabling security software, and restarting VS Code or computers, you can gradually troubleshoot and resolve issues.

Linux Architecture: Unveiling the 5 Basic Components Linux Architecture: Unveiling the 5 Basic Components Apr 20, 2025 am 12:04 AM

The five basic components of the Linux system are: 1. Kernel, 2. System library, 3. System utilities, 4. Graphical user interface, 5. Applications. The kernel manages hardware resources, the system library provides precompiled functions, system utilities are used for system management, the GUI provides visual interaction, and applications use these components to implement functions.

Can vscode be used for mac Can vscode be used for mac Apr 15, 2025 pm 07:36 PM

VS Code is available on Mac. It has powerful extensions, Git integration, terminal and debugger, and also offers a wealth of setup options. However, for particularly large projects or highly professional development, VS Code may have performance or functional limitations.

How to use VSCode How to use VSCode Apr 15, 2025 pm 11:21 PM

Visual Studio Code (VSCode) is a cross-platform, open source and free code editor developed by Microsoft. It is known for its lightweight, scalability and support for a wide range of programming languages. To install VSCode, please visit the official website to download and run the installer. When using VSCode, you can create new projects, edit code, debug code, navigate projects, expand VSCode, and manage settings. VSCode is available for Windows, macOS, and Linux, supports multiple programming languages ​​and provides various extensions through Marketplace. Its advantages include lightweight, scalability, extensive language support, rich features and version

How to check the warehouse address of git How to check the warehouse address of git Apr 17, 2025 pm 01:54 PM

To view the Git repository address, perform the following steps: 1. Open the command line and navigate to the repository directory; 2. Run the "git remote -v" command; 3. View the repository name in the output and its corresponding address.

What is vscode What is vscode for? What is vscode What is vscode for? Apr 15, 2025 pm 06:45 PM

VS Code is the full name Visual Studio Code, which is a free and open source cross-platform code editor and development environment developed by Microsoft. It supports a wide range of programming languages ​​and provides syntax highlighting, code automatic completion, code snippets and smart prompts to improve development efficiency. Through a rich extension ecosystem, users can add extensions to specific needs and languages, such as debuggers, code formatting tools, and Git integrations. VS Code also includes an intuitive debugger that helps quickly find and resolve bugs in your code.

See all articles