This article explains the concept, architecture, and trade‑offs of various RAID levels—including RAID 0, 1, 2, 3, 4, 5, 6, and hybrid configurations—detailing how they combine multiple inexpensive disks to achieve different balances of speed, capacity, and fault tolerance for server environments.
This guide walks you through downloading, installing, configuring, and testing Fail2Ban on a Linux system, covering essential parameters, SSH jail setup, custom actions, filter editing, and command‑line utilities for managing bans and logs.
This guide reviews eleven Linux tools and commands—including iptraf, sar, ntop, and tcpdump—for monitoring network traffic, explains installation steps for various distributions, and describes how to interpret their output, helping administrators keep web servers performant and secure.
This article explains why high CPU usage on Linux servers isn’t always a problem, describes how to identify true CPU bottlenecks using tools like uptime, top, sar and vmstat, and offers practical tuning steps such as stopping unnecessary processes, adjusting priorities, using CPU affinity, and updating drivers.
This article explains Linux's real‑time and general scheduling policies—including SCHED_RR, SCHED_FIFO, SCHED_NORMAL, SCHED_BATCH, and SCHED_IDLE—describes their behavior, and demonstrates their impact on CPU allocation through practical chrt command tests.
This article compiles a curated list of essential Linux operations books, ranging from beginner-friendly introductions and system‑administration handbooks to advanced texts on operating‑system theory, kernel design, networking, and hands‑on system building, offering a comprehensive learning roadmap for aspiring Linux engineers.
This guide presents a comprehensive set of Linux commands and practical steps for detecting, analyzing, and responding to compromised systems, covering process identification, file inspection, network checks, log recovery, forensic imaging, and useful tools such as ldd, strace, and nc.
The author recounts how a university encounter and later work demands led them to master Unix, using tools like awk, Perl, Python and Ruby to automate massive data tasks, teach courses, and champion Ubuntu and other Unix-like systems as essential, productivity‑driving platforms.
This article explains what zombie processes are in Unix/Linux, shows how to list and count them using ps and top, provides commands to terminate them by killing their parent or sending signals, and offers strategies such as ignoring SIGCHLD or double‑forking to prevent their creation.
Drawing from a year and a half of Linux operations experience, this guide outlines practical standards for online actions, data handling, security, monitoring, performance tuning, and the right mindset to prevent costly incidents and maintain stable, secure systems.
This guide lists 25 practical Linux hardening techniques—from BIOS protection and partitioning to SSH configuration, SELinux, firewall rules, password policies, and log management—helping system administrators strengthen server security against attacks and vulnerabilities.
This article explains the fundamental concepts of Linux terminal devices—including tty, pseudo‑terminal (pty), and virtual terminal (pts)—and details the various /dev entries such as serial ports, controlling terminals, console terminals, and their practical usage examples.
This article outlines the origins, release cycle, commercial licensing, feature set, and derivative distributions of Red Hat Enterprise Linux, focusing on version 7’s hardware support, kernel enhancements, storage, networking, virtualization, container integration, toolchain, and system management capabilities.
The article details the official CentOS 7.0.1406 64‑bit release announced on July 7, 2014, highlighting kernel upgrades, container support, default JDK, installation media options, verification steps, major changes, downgrade options, known issues, and where to obtain source code and ISO images.
This guide introduces Linux Logical Volume Manager (LVM), explains its core concepts such as physical volumes, volume groups, and logical volumes, and provides step‑by‑step procedures for checking versions, handling common failures, and performing disaster‑recovery operations on both server and desktop systems.
This tutorial explains what the umask setting does, shows the octal permission masks, and provides step‑by‑step instructions for permanently modifying the default umask in a user’s shell profile or /etc/profile on any Linux distribution.
The article presents a curated Chinese‑language reading list for application operations and system administration, dividing essential titles into technical culture, core technical, and peripheral works, and recommending classics such as The Pragmatic Programmer, Unix Super Tools, Continuous Delivery, Mastering Regular Expressions, Ruby Metaprogramming, and even interdisciplinary books like The Zen of Presentation and Approaching Chinese Medicine.
