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This article introduces the core knowledge of Linux environment variables. Environment variables are variables that store system or program runtime information, such as software paths, language settin

**Summary:** This article introduces Linux firewalls, which act as the "gatekeepers" of servers to restrict network access and primarily protect servers from attacks. The mainstream tools are categori

This article introduces the necessity and practical methods of Linux network configuration. For newcomers, mastering network configuration is fundamental for using servers and setting up services. The

This article introduces the core methods for managing Linux services. Services are background - running programs, and management is fundamental to system maintenance. Modern Linux uses the systemctl t

The core of Linux server backup is to create data copies to mitigate risks such as accidental deletion and system failures. Backups are categorized by content into three types: full (copies all data),

Partitioning and mounting disks in Linux are fundamental operations for managing storage, analogous to closet organization and entry points. The steps are as follows: 1. **Check Disks**: Use `lsblk` o

This article introduces the necessity and common methods for opening ports on Linux servers, helping beginners get started quickly. Opening ports is fundamental for services to communicate externally

Linux server time synchronization is a fundamental and critical task. The Network Time Protocol (NTP) is the core tool that addresses issues such as log chaos, service authentication failures, and dat

This article introduces the core knowledge of Linux user and user group management, aiming to achieve permission control and resource isolation. Users are categorized into root (UID 0, highest privile

SSH key-based login (passwordless login) ensures security through asymmetric encryption and eliminates the need to enter passwords, making it suitable for Linux server management. Traditional password