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Linux Security 101: Key System File and Directory

Linux Security 101: Key System Files and Directories Every User Should Protect

Linux is an efficient and widely used operating system, especially in server, development and cybersecurity. 🖥️

Linux is known for its stability and flexibility; making it a popular choice for both professionals and everyday users. ✨

However, the popularity of Linux systems also makes them a target for 🚨 attackers.

Understanding important files and directories in Linux is essential for several reasons:

♦ Security 🔒: Understanding critical directories allows you to recognize if something goes wrong, such as unauthorized changes that may be a sign of a security breach.

♦ Backup and Recovery 💾: Knowing which files and directories are important, you can make better decisions about what needs to be backed up to avoid data loss or system failure.

♦ System Management 🛠️: Knowing where the core system file is located will help you manage and troubleshoot your Linux system more efficiently.

♦ Custom Configuration ⚙️: Linux gives you a lot of control over system settings. Familiarity with system files allows you to customize the operating system to meet your specific needs.

In a nutshell, knowing that important Linux files and system directories make you a more efficient and secure user. The full use and flexibility of Linux can be achieved. 🛡

This cybersecurity cheat sheet offers a brief overview of the most important directories and files in the Linux 📚 system.

Please save / bookmark this cheat sheet for future reference. 🔖

# informationsecurity # Cybersecurity # Security # linux # klex # infosec # Trending # Drug sign with lemon8 # it # Lemon 8 Club

2024/9/26 Edited to

... Read moreการรักษาความปลอดภัยในลินุกซ์ไม่เพียงแต่เป็นเรื่องของความไว้วางใจแต่ยังเกี่ยวข้องกับไฟล์และไดเรกทอรีที่สำคัญ การรู้จักไฟล์ที่มีความสำคัญ เช่น /etc/passwd และ /etc/shadow ทำให้ผู้ใช้สามารถป้องกันการโจมตีและรักษาความปลอดภัยข้อมูลได้ดีขึ้น จำเป็นต้องเข้าใจความเสี่ยงที่อาจเกิดขึ้นจากการที่ผู้โจมตีอาจเข้าถึงข้อมูลสำคัญเหล่านี้ การบริหารจัดการไดเรกทอรีที่มีความสำคัญ เช่น /var/log สำหรับบันทึกการเข้าถึงและการใช้งาน จะช่วยให้ผู้ใช้สามารถตรวจสอบกิจกรรมที่ผิดปกติได้ทันที และการสำรองข้อมูลจาก /home หรือ /var/lib จะพิจารณาถึงการป้องกันข้อมูลสูญหายได้อย่างมีประสิทธิภาพ โดยเฉพาะที่สำคัญคือการวิเคราะห์ไฟล์ที่มีความเสี่ยงสูง เช่น /etc/sudoers ที่สามารถเปลี่ยนแปลงให้ผู้ใช้ที่ไม่พึงประสงค์แทรกแซงระบบ ในทุกๆ ไดเรกทอรี ควรมีการตั้งค่าการเข้าถึงที่เหมาะสมเพื่อป้องกันการเข้าถึงโดยไม่ได้รับอนุญาต ผลิตภัณฑ์ได้แก่การใช้คำสั่งตรวจสอบสำหรับการรับรู้การเปลี่ยนแปลงไฟล์ที่สำคัญในระบบ การศึกษาเกี่ยวกับการใช้เครื่องมือที่ช่วยตรวจสอบสถานะและความมั่นคงของระบบอย่างสม่ำเสมอจะช่วยสร้างความเข้าใจส่วนประกอบต่างๆ ของ Linux และสามารถป้องปรามภัยที่อาจเกิดขึ้นได้อย่างเหมาะสมที่สุด

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The image displays the title 'WGU D317 - IT APPLICATIONS EXAM 2025/2026 | COMPUTER SECURITY AND MANAGEMENT | 160 VERIFIED QUESTIONS AND ANSWERS' and the first three multiple-choice questions with their selected answers, covering Linux interaction, app extensions, and Windows network profile features.
This image shows multiple-choice questions and answers related to IT applications. It includes questions about scheduling tasks, troubleshooting wireless networks, the significance of Windows firewall configurations, and the console used to manage services, with the correct answers marked.
The image presents multiple-choice questions and answers on IT topics. It covers Linux backup tools, the folder for 32-bit programs on 64-bit Windows, the role of Trusted Root Certification Authorities, and the command to find Windows build information.
WGU D317 - IT APPLICATIONS EXAM 2025/2026
To grab your guide email knoowyy446@gmail.com WGU D317 IT Applications Exam 2025/2026 | Computer Security & Management | 160 Verified Questions & Accurate Answers Get exam-ready and ace your WGU D317 – IT Applications Exam 2025/2026 with confidence! 💻📘 This complete prep guide includes
Lemon367443437826

Lemon367443437826

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An infographic titled 'How SSH Protocol Works' illustrates the seven steps for establishing a secure SSH connection between a client and server. It details the process from TCP handshake and algorithm negotiation to Diffie-Hellman key exchange, client authentication, session establishment, and data interaction.
How SSH protocol works
SSH is a secure network protocol that allows encrypted remote access, command execution, and file transfers between devices across untrusted networks Here is a step by step procedure for the SSH protocol to establish a secure channel 😎👇 #infosec #technology Find high-res pdf books with
Learn Linux with Dan

Learn Linux with Dan

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This infographic presents a 'Roadmap to Learning Linux' by Dan Nanni, categorizing skills into Beginner, Intermediate, and Advanced levels. It lists essential topics like file management, system information, networking, service management, kernel configuration, system performance, and security, along with relevant commands and tools for each stage.
Roadmap to learning Linux
Linux powers everything from servers and cloud platforms to supercomputers and embedded devices. Learning Linux builds practical skills that can help in system administration, cybersecurity, cloud computing, networking, and DevOps. Here is a roadmap for learning Linux, from beginner to advanced
Learn Linux with Dan

Learn Linux with Dan

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Linux commands for log processing
Analyzing log files on Linux is crucial for maintaining security and system performance. It helps uncover unauthorized access attempts or breaches and also aids in troubleshooting problems that impact stability and efficiency Here are popular Linux commands for log processing 😎 #software #de
Learn Linux with Dan

Learn Linux with Dan

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Linux encryption tools
Linux gives you multiple ways to encrypt your data, and each tool works at a different layer of the stack. Some encrypt entire disks. Some protect individual files or file systems. Others secure email, network traffic, or even hide data inside images. The right choice depends on what you want
Learn Linux with Dan

Learn Linux with Dan

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An infographic titled 'OS-level Sandboxing Mechanisms' by Dan Nanni, comparing sandboxing features across Linux Containers, Windows Containers, MacOS App Containers, and FreeBSD Jails. It highlights specific isolation, resource management, and security features for each operating system's container technology.
Application sandboxing across different OS
OS-level sandboxing provides kernel-enforced isolation that restricts processes, filesystems, and resources, ensuring applications run in contained and controlled environments Here is a comparison of sandboxing support across different OS 😎👆 #linux #macos #windows #freebsd Find a hi
Learn Linux with Dan

Learn Linux with Dan

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An infographic titled "Linux Sandboxing Tools" by Dan Nanni categorizes tools into User Space (e.g., gVisor, Docker, Flatpak) and Kernel Space (e.g., Seccomp, SELinux, eBPF). It illustrates various tools for isolating applications on Linux.
Sandboxing tools for Linux
The goal of “sandboxing” is to improve system security by isolating apps in controlled environments. To achieve this goal, Linux kernel offers core features like syscall filtering and namespaces, while userspace tools make it easier to confine apps using these kernel mechanisms Here are sandboxi
Learn Linux with Dan

Learn Linux with Dan

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Different types of encryptions
Encryption comes in several major forms, including symmetric ciphers that share one secret key, public-key systems that use paired keys, quantum-safe approaches built to resist future attacks, and homomorphic schemes that keep data hidden even while it is being processed. 😎👆 Find a high-res pdf
Learn Linux with Dan

Learn Linux with Dan

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An infographic titled 'Linux Filesystem Commands' by Dan Nanni, categorizing commands for managing filesystems. It lists common commands like mkfs and df, along with specific commands for EXT, ZFS, Btrfs, and XFS filesystems, detailing their functions for formatting, checking, resizing, and managing.
Useful Linux filesystem commands
Linux filesystem tools are divided into two types: those that work universally across all filesystems, and those designed for specific filesystems, taking advantage of their unique features and layout Here are useful Linux filesystem commands 😎👆 #devops #softwaredeveloper #TechTips #sof
Learn Linux with Dan

Learn Linux with Dan

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Useful systemd commands
Systemd tools like systemctl and journalctl are key utilities in Linux for controlling system services—allowing you to start, stop, and check the status of services, as well as view system logs for troubleshooting Here is a list of useful systemd commands 😎👆 #softwaredeveloper #softwareengin
Learn Linux with Dan

Learn Linux with Dan

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An infographic titled "Open-source Privacy Tools" lists various software for digital privacy. Categories include Encrypted & Secure Storage, Private Browsing, Privacy-Focused Operating Systems, Password Management, Virtual Private Networks, Anonymous File Sharing, Secure Messaging, Metadata & Privacy Cleaning, and DNS Privacy, with examples for each.
Open-source privacy tools
How do you protect your privacy online? You start by locking down your data with encryption, using a password manager for strong logins, browsing with privacy-focused tools, chatting on secure messaging apps, running a reliable VPN to shield your connection, and clearing hidden metadata so nothing
Learn Linux with Dan

Learn Linux with Dan

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