Detailed Explanation of Linux Network Card Parameters: Understanding ‘ip a’ Output with Real Cases!

🔥 When you see the output of <span><span>ip a</span></span>, are you confused by the mysterious parameters like <span><span>LOOPBACK</span></span>, <span><span>fq_codel</span></span>, and <span><span>metric 100</span></span>? 🔥 This article uses real terminal output examples to analyze the meaning of each parameter line by line and reveals how to diagnose network issues using them!🚀 At the end of the article, … Read more

Detailed Explanation of Ubuntu Netplan in Linux IP

Detailed Explanation of Ubuntu Netplan 1. Overview Netplan is a new network configuration tool introduced in Ubuntu starting from version 17.10, designed to simplify and unify the network configuration process. It defines network interface settings through YAML configuration files and supports <span>NetworkManager</span> and <span>systemd-networkd</span> as backends. Advantages Readable and writable YAML format. Unified configuration method. … Read more

Linux Directory Management Commands

Linux Directory Management Commands1. Displaying the Path (pwd) 1. Command Function The pwd command is used to display the absolute path of the current working directory. 2. Command Format The format of the pwd command is:pwd.3. Command Examples Example 1: Log in as the root user and display the home directory of the root user. … Read more

Summary of Troubleshooting 100% CPU Usage on Linux

Follow “Java Matters” and select “Star” to receive a free Java book package, whether you are a newcomer or an experienced developer in this new era.Source: Online. When your server’s CPU reaches 100%, how do you troubleshoot the abnormal fault? At the end of this article, a shell script will be shared to help you … Read more

The Perf Tool in Linux Kernel: An Analysis of Its Implementation Principles

[Image] In the vast realm of the Linux kernel, performance optimization and fault diagnosis stand as two towering peaks, obstructing the path of developers. To scale these two heights, developers are constantly in search of powerful tools. Among them, perf is undoubtedly one of the most dazzling “artifacts.” When running a complex Linux system, have … Read more

Detailed Explanation of the RedHat nmcli Tool in Linux IP

RedHat <strong><span>nmcli</span></strong> Tool Overview 1. Overview <span>nmcli</span> is a command-line interface tool provided by NetworkManager for managing network connections in Linux systems. It supports configuration, management, monitoring, and debugging of network devices and connections. For Red Hat-based distributions (such as RHEL, CentOS, etc.), <span>nmcli</span> is the standard network management tool. 2. Installation and Version Check … Read more

Comprehensive Guide to Disk Expansion in Linux Systems

Click the blue “Most Programmer” to follow me! Add a “star“, every day at 18:03 to learn technology together Disk Expansion in Linux Systems After adding the disk in the console, Add Partition After restarting the system, perform the following operations Disk Partitioning [root@oracle ~]# fdisk /dev/sda Welcome to fdisk (util-linux 2.23.2). Changes will remain … Read more

Common Linux Commands to Enhance Operational Efficiency

1、ls command is an abbreviation for list. The ls command can be used not only to view the files contained in a linux directory but also to check file permissions (including directory, folder, and file permissions) and to view directory information, etc. Common parameter combinations: ls -a lists all files in the directory, including hidden … Read more

Setting Up a Linux Firewall for Uncompromised Security

In the battlefield of network security, firewalls act as vigilant sentinels, weaving rules with code to protect the borders of the digital world. When you hold a Linux system in your hands, this operating system, inherently equipped with “security genes,” has already prepared various firewall tools for you. Let us break down the core value … Read more

How to Use man to View Help Documentation on Linux

Linux provides many commands and configuration files. How can we view the usage of these commands and configuration files? The commands and help documentation provided by Linux come with their own help documentation to explain the usage of commands and the format of configuration files. At the same time, Linux provides the <span>man</span> command to … Read more