This guide collects a variety of unconventional methods—from simple kill commands and one‑liners to Docker container tricks and even humorous "power‑off" scripts—to force‑quit Vim, illustrating both practical shortcuts and tongue‑in‑cheek approaches for developers who struggle with the editor's exit commands.
This guide explains the various special file types under Linux's /dev directory, shows how to identify them with ls, and demonstrates practical uses of /dev/null, /dev/full, /dev/zero, /dev/random, /dev/urandom, and /dev/pts through concrete command‑line examples.
The article explains Unix's core design that treats files, devices, sockets, and pipes as unified resources accessed via file descriptors, discusses the abstraction trade‑offs, and pays tribute to the pioneers behind these concepts while illustrating the ideas with several diagrams.
This guide explains how to use the Linux seq command to create numeric sequences, customize start, end, and step values, apply separators, pipe results to calculators like bc, and highlights performance tips and limitations for effective shell scripting.
This article describes a real‑world Ceph storage incident caused by disk bad sectors, analyzes its impact, and presents two practical recovery methods—full disk copy with dd+nc and skipping the faulty sector during service start—along with detailed commands and post‑recovery steps.
This article introduces twenty powerful Linux command‑line utilities—from fast recursive search tools and interactive Git viewers to code formatters, process monitors, and smart auto‑correction helpers—explaining their core functions, typical use cases, and example commands to streamline development and system administration tasks.
This guide explains why Docker consumes large amounts of disk space, breaks down the different types of storage Docker uses, and provides step‑by‑step commands to clean up containers, images, volumes, and build caches so you can free up space efficiently.
This guide explains Linux package naming conventions, how to inspect binary dependencies and installed libraries, and provides a comprehensive collection of RPM and YUM commands—including installation, query, verification, removal, and repository configuration—to help administrators manage software efficiently.
A Linux laptop with a 4K display suffered extreme CPU usage and fan noise during video playback, which vanished after disabling 200% UI scaling and using a lower resolution with 100% scaling, revealing a scaling‑related bug in the graphics stack.
This article describes a tiny Linux‑based business card that boots in seconds, includes classic games and a MicroPython interpreter, runs on an 8 MB Allwinner F1C100s chip, and can be built for under three dollars using inexpensive components and DIY PCB fabrication.
The Linux 5.3 series receives its final maintenance release (5.3.18) with 59 file changes, after which support ends, prompting users and distro maintainers to upgrade to the newer 5.4 kernel, which introduces long‑awaited exFAT filesystem support and the Lockdown security feature.
This guide explains Linux's three identity types (owner, group, others) and their read/write/execute permissions, shows how to interpret ls -al output, and provides detailed syntax, options, and practical examples for changing owners with chown, groups with chgrp, and permissions with chmod using both symbolic and numeric methods.
This article presents a comprehensive guide to Linux performance analysis, covering CPU, memory, disk I/O, network, system load, flame‑graph techniques, and a real‑world Nginx case study, enabling engineers to quickly locate and resolve bottlenecks.
Joey Sneddon forecasts a surge in Linux hardware, a pivotal Ubuntu LTS release, major WSL improvements, the possible emergence of a GNOME‑based OS, and a shift toward lightweight distributions, outlining the key trends that will shape Linux and open‑source ecosystems in 2020.
This article provides a thorough overview of MySQL optimization, covering the underlying philosophy, risk considerations, participants, optimization scope across hardware, system, application, and database layers, practical tools, command‑line techniques, and detailed tuning recommendations for both system and database parameters.
This article walks through the full‑stack process of migrating and compiling the CDH Hadoop distribution on Kunpeng cloud servers, covering environment setup, dependency installation, source code adjustments, common build errors, and final packaging for a production‑ready big‑data platform.
This comprehensive tutorial walks you through preparing the environment, installing and configuring OpenLDAP on CentOS, securing it with TLS/SSL, setting up phpldapadmin, defining ACLs, enabling master‑slave replication, and implementing Keepalived for VIP‑based high availability, all with ready‑to‑use scripts and configuration files.
Darktable 3.0, the open‑source RAW editor, brings a redesigned UI, new 3D LUT module, enhanced denoise profiling, additional filter modes, better 4K/5K support and more, and this guide shows how to install, update, or remove it on Ubuntu and other Linux distributions.
A four‑year‑old girl submitted a one‑character patch to the Linux kernel that added a dash for proper alignment, illustrating the openness of the kernel project, the meticulous nature of its codebase, and the surprising impact of even the smallest contributions.
This guide explains how to monitor Linux log files in real time using commands such as tail (with -f, -F, and -n options), tailf, multitail, lnav, and less, including installation instructions for various distributions and examples for Apache logs.
This article provides a comprehensive analysis of Linux's epoll mechanism, covering its fundamental data structures, key kernel functions, wait‑queue handling, event insertion, wake‑up logic, and the differences between edge‑triggered and level‑triggered modes, while including full source code excerpts for reference.
This article documents a hands‑on experiment that allocates a 50 GB Redis instance on a 64 GB dual‑node machine, explores NUMA behavior, demonstrates how memory affinity can trigger swap, and concludes with practical recommendations for Redis memory sizing and NUMA binding.
Ubuntu Cinnamon Remix is a community‑driven Linux distribution that blends Ubuntu's base with the Cinnamon desktop, offering a distinct set of packages, installation steps, and support considerations compared to Linux Mint, while still leveraging Ubuntu's repositories and update mechanisms.
An extensive guide walks through Linux’s core components—kernel, memory and process management, VFS, device drivers, networking, shells, filesystem hierarchy, partitioning, mounting, and link types—detailing their structures, key commands, and practical examples for system administrators and developers.
This tutorial walks through setting up a Kunpeng development environment, building a simple Hello World program, creating a cross‑platform CMake project, and compiling, installing, and packaging MySQL 5.7 as RPM/DEB packages for CentOS 7 and Ubuntu 18.04.
This comprehensive guide walks you through the core features of the cURL command-line tool, covering file downloads, redirects, resumable transfers, timeouts, authentication, proxy usage, chunked downloads, silent mode, header manipulation, and both uploading files and sending or reading emails.
This guide outlines a comprehensive Linux incident‑response workflow—identifying suspicious behavior, locating and terminating malicious processes, eliminating virus files, closing persistence mechanisms, and hardening the system—while providing concrete shell commands, monitoring techniques, and remediation tips to effectively combat Linux malware.
This guide explains the purpose of Linux runlevels, maps them to systemd targets, shows how to check the current runlevel, change it temporarily or permanently, list services per level, create custom levels, and improve system security through fine‑grained service control.
This comprehensive Linux tutorial explains why grep is indispensable, demonstrates basic and advanced string searches, multiple patterns, regex usage, recursive scans, whitespace handling, differences among grep variants, find vs grep, compressed‑file searches, IP and email extraction, case handling, exclusions, replacements, line numbers, context lines and result sorting.
This article explains how to install perf and FlameGraph tools on Linux, capture profiling data from MySQL using various perf record options, convert the binary output to a readable script, and generate an SVG flame graph for visual performance analysis, including example commands and interpretation tips.
This step‑by‑step guide shows how to prepare a Raspberry Pi Zero W, flash a Raspbian Lite image, enable SSH and Wi‑Fi, install and configure Nginx, and expose the device to the internet using Ngrok, complete with commands, configuration files and screenshots.
This article explains TCP state definitions, Linux commands for monitoring connections, the three‑way handshake, four‑way termination, common pitfalls like SYN‑Flood attacks, and practical tips such as keepalive configuration to diagnose and resolve network or socket problems.
This guide explains Linux regular expressions, distinguishes shell and regex metacharacters, shows how to enable colored grep output, provides a sample test file, and walks through numerous practical pattern-matching examples with clear visual illustrations.
This article presents a concise Vim cheat sheet covering entry, configuration, cursor movement, scrolling, text insertion, deletion, copy‑paste, undo, search‑replace, bookmarks, visual mode, linewise commands, macros, window management, and file operations, illustrated with clear screenshots for Linux users.
This guide walks you through setting up the open‑source MySQL Monitor tool, covering environment preparation, installation, database schema import, host configuration, alert channel setup (email and WeChat), cron scheduling, and accessing the monitoring pages, all with a clean Chinese interface.
This guide walks you through a complete Linux emergency response workflow—identifying suspicious behavior, terminating malicious processes, removing infected files, eliminating persistence mechanisms, hardening the system, and adding command auditing—using practical shell commands and examples.
This guide walks you through setting up a Kunpeng ARMv8-compatible development environment using QEMU on Windows x86, Linux x86, and a Huawei Cloud ECS KC1 instance, covering required downloads, BIOS setup, disk image creation, VM launch commands, and OS installation steps.
This guide outlines essential Linux performance evaluation areas—CPU, memory, disk I/O, network I/O, and overall system load—detailing the primary commands (vmstat, free, iostat, ifstat, top), interpreting their output fields, and offering practical thresholds for diagnosing bottlenecks.
Discover a curated list of fifteen powerful command‑line utilities—from fast file searchers and interactive Git viewers to multi‑threaded downloaders and terminal session recorders—that can dramatically improve productivity and monitoring for system administrators and DevOps engineers.
This guide walks through installing Zabbix 4.4.0 on CentOS 7, configuring PostgreSQL, adding the TimescaleDB time‑series extension, setting up the Zabbix database, and tuning Linux, Nginx, and PHP so the monitoring platform runs smoothly with high‑performance time‑series storage.
This guide explains how to optimize disk I/O on Kunpeng processors by outlining the underlying performance bottlenecks, introducing essential monitoring tools like iostat, and detailing practical kernel and filesystem tuning methods—including dirty page settings, read-ahead adjustments, I/O scheduler selection, and XFS configuration.
This guide explains how to use Cobbler, an automated provisioning tool, to streamline large‑scale OS installations on servers, covering installation, configuration of DHCP/TFTP/RSYNC, creating repos, managing distros and profiles, and deploying CentOS via PXE with practical command examples.
This tutorial walks you through installing VirtualBox, setting up a CentOS Linux virtual machine, and using Xshell to remotely access the system, covering download links, configuration steps, partitioning details, and essential command-line tips.
This article compares Ubuntu and Fedora from a desktop perspective, covering installation ease, default desktop environments, package managers, hardware driver support, community resources, release cycles, underlying foundations, and enterprise backing to help readers decide which distribution suits their needs.
This article explains how lxcfs, a FUSE‑based user‑space filesystem, isolates the /proc and /sys virtual files for containers, details its implementation for reading cpuonline and load average, and provides code examples of the core functions that enable per‑container system metric visibility.
Linux Kernel 5.4, the final major stable release of 2019, introduces significant network driver updates, lock‑down security enhancements, native exFAT support, AMD Radeon graphics improvements, and a host of hardware and filesystem upgrades, offering developers and manufacturers a more secure and versatile platform.
This article explains what Artifactory is, its role as a binary repository manager comparable to Git for binaries, and provides step‑by‑step instructions for installing, starting, stopping, accessing, and upgrading Artifactory on a Linux system.
This guide walks you through a systematic, step‑by‑step process for diagnosing and resolving poor‑performance or failure incidents on Linux servers, covering everything from gathering context and checking who is logged in to inspecting processes, network services, hardware, I/O, logs, cron jobs and application‑level diagnostics.
This article explains the four main I/O models—blocking, non‑blocking, I/O multiplexing (select/epoll), and asynchronous I/O—in the context of Linux network programming, clarifying their mechanisms, differences, and when each model is appropriate.
This article explains how lxcfs uses FUSE and cgroup technology to isolate /proc and /sys files inside containers, showing the implementation details of cpuonline and loadavg handling, and includes key source code snippets that illustrate the isolation mechanism.
Explore the core concepts of GNU/Linux, including the GNU project and GPL license, Linux distributions, Unix heritage, swap partitions, GRUB bootloader, buffer vs cache, TCP three-way handshake, directory hierarchy, hard and symbolic links, and RAID storage levels, all explained in clear detail.
This comprehensive guide explains Linux firewall fundamentals, the netfilter framework, firewalld architecture, zone and service management, command‑line and graphical tools, as well as practical examples of configuring zones, services, ports, rich rules, and troubleshooting common issues.
This article investigates the implementation of Java's System.currentTimeMillis() on Windows, macOS, and Linux, measures its execution speed, explores the underlying native methods and OS time‑source mechanisms such as TSC, HPET, and RTC, and discusses performance implications and best practices for high‑frequency timestamp retrieval.
This article provides an in‑depth exploration of Linux’s timekeeping subsystem, covering how the kernel initializes and maintains system time, reads timestamps via vDSO and sequential locks, manages timers with various algorithms, and explains the underlying quartz crystal oscillator that generates the hardware clock.
This guide shows how to install GNOME Tweaks on Ubuntu and walk you through ten practical adjustments—including theme changes, animation disabling, icon control, extension management, font scaling, touch‑pad behavior, power settings, top‑panel items, window controls, and workspace configuration—to fully customize your GNOME desktop.
This article outlines how to transform manual and scripted operations into automated and intelligent processes by applying comprehensive shell scripting standards, avoiding common pitfalls, and implementing risk‑mitigation techniques such as proper headers, quoting, logging, concurrency locks, and safe file handling.
This guide explains how to install the open‑source Asciinema tool, record and replay terminal sessions with various options, understand its compact .cast file format, and set up automatic session logging for comprehensive audit trails, making terminal activity tracking efficient and lightweight.
This article explains how to achieve high‑availability software load balancing by combining the open‑source HAProxy reverse‑proxy with Keepalived, covering installation, configuration of VRRP, health checks, session persistence, SSL termination, and traffic routing on CentOS systems.
The article details how Ctrip engineers diagnosed sporadic Redis timeouts in containerized deployments, traced the problem to kernel scheduling delays caused by an APIC‑ID bug that inflated the possible‑CPU count, and resolved it by applying a kernel patch, offering verification steps for affected systems.
This article compiles ten common Linux operational problems—from shell script failures and cron output issues to disk space exhaustion and MySQL errors—detailing their causes and step‑by‑step solutions to help sysadmins quickly diagnose and resolve system faults.
Learn how to monitor Linux log files in real time using built‑in tools like tail, tailf, and tail ‑F, as well as advanced utilities such as multitail, lnav, and less, with command examples for Apache access logs and tips for handling rotated logs.
This guide walks you through common Linux boot failures—such as forgotten root passwords, disk sector errors, and GRUB configuration mistakes—by showing how to use single‑user mode, GRUB commands, and the Linux rescue environment to diagnose and repair the system.
This article provides a comprehensive list of common Linux command-line utilities, grouped by functionality such as file manipulation, system monitoring, user management, networking, and more, with brief descriptions of each command’s purpose.
The article explains how modern servers with multiple CPUs and memory modules connect via legacy Front Side Bus and modern NUMA architectures, demonstrates Linux commands to inspect memory topology, and presents benchmark results showing latency differences between intra‑node and inter‑node memory accesses.
This article explains the Linux mmap system call, covering virtual address space fundamentals, how mmap interacts with the page cache and inode structures, typical use‑cases such as shared memory and anonymous mappings, code examples, and special considerations like alignment, copy‑on‑write and memory swapping.
This guide explains how to set up Squid as an explicit or implicit forward proxy on Linux, covering SSL/TLS termination, required build tools, user creation, compilation options, CA generation, detailed squid.conf settings, and necessary iptables NAT rules.
This guide explains how to troubleshoot Linux boot problems by using single‑user mode to reset forgotten root passwords, repairing disk errors with fsck, correcting GRUB configuration mistakes, and employing Linux rescue mode to restore missing system files or rebuild the bootloader for dual‑boot systems.
Fedora 31 introduces GNOME 3.34, drops 32‑bit boot images, replaces Docker with podman, updates core packages like Glibc, NodeJS and Python, improves hardware support and flavors, and provides guidance on upgrading from earlier Fedora releases.
At the European Open‑Source Summit, Linus Torvalds explained that he now spends his days reviewing and replying to email patches, acting as a code maintainer rather than a developer, while reflecting on Git’s impact, his evolving role, and lingering imposter syndrome.
This article explains how Linux reports CPU usage with tools like top, the meaning of the fields in /proc/stat, how utilization percentages are calculated, the concepts of run queues, load average, context switching, multi‑core scheduling, and how to use perf and taskset for deeper performance analysis.
A 100 M dedicated line with 20 ms latency caused a 22 MB SQL query to take over 25 seconds, prompting an in‑depth analysis of how socket send/receive buffers, sysctl rmem/wmem settings, and TCP windows interact and affect network performance.
This guide introduces the Pure Bash Bible—a popular GitHub repository that compiles essential built‑in Bash commands for string manipulation, arrays, loops, and file handling—providing concise examples and practical code snippets to boost your shell scripting efficiency.
This guide explains how to create a production‑grade, near‑real‑time MySQL data‑synchronisation and query platform using Alibaba's open‑source Otter middleware, covering architecture, key features, installation steps, configuration of manager and node components, and best practices for safe query operations.
Learn how to effectively use tcpdump for network packet capture, understand its syntax and expression filters, explore common parameters, and see practical examples of analyzing MySQL traffic and packet details, empowering you to troubleshoot network issues and perform deep packet analysis.
A recently disclosed Linux kernel vulnerability (CVE‑2019‑17666) in the Realtek RTLWIFI driver allows remote code execution via specially crafted Wi‑Fi Direct frames, affecting devices with Realtek chips and requiring no user interaction, with a fix pending kernel integration.
Learn how to install and enable the Windows Subsystem for Linux on Windows 10, choose a Linux distribution from the Microsoft Store, activate the required Windows features, and configure Ubuntu with a user account—all illustrated with clear screenshots for a hassle‑free setup.
Ubuntu 19.10 “Eoan Ermine” introduces LZ4 fast‑boot compression, ZFS file‑system support, and GNOME 3.34, and the article explains key features, upgrade paths from earlier releases, download links, and alternative Ubuntu flavors, while warning against unsupported upgrade methods.
This article walks through a real‑world case of an Oracle RAC/ADG deployment on CentOS 7 that suffered severe performance degradation, detailing the root‑cause analysis, OS and listener tuning, patch installation, cache‑reclamation settings, and compatibility fixes to restore stability.
This article provides a comprehensive guide to the most frequently used Linux shell text‑processing utilities—find, grep, xargs, sort, uniq, tr, cut, paste, wc, sed, and awk—offering practical examples, command‑line options, and tips for efficient one‑ or two‑line scripts.
This article presents a curated collection of over a hundred free technical books—including Linux command‑line guides, system‑administration manuals, computer‑networking textbooks, and Docker tutorials—complete with brief descriptions, download links, and the impressive GitHub star and fork statistics of the source project.
This article explains how to write a Groovy script for a CI pipeline that lists webapp directories on a Linux server, keeps the newest four, sorts them by modification time, and deletes the older ones using sudo to overcome permission issues, complete with full source code.
This article explains the role of load balancers in large-scale internet applications, introduces Linux Virtual Server (LVS) as a four‑layer software load‑balancing solution, describes its architecture, NAT/TUN/DR forwarding methods, and details various static and dynamic scheduling algorithms such as Round Robin, Weighted Least‑Connection, and locality‑based strategies.
This guide details a step‑by‑step setup of a highly available GitLab service using two virtual machines, DRBD for block‑level replication, configuration of GitLab and PostgreSQL directories, DRBD resource creation, service start‑up, and manual primary‑secondary failover procedures.
This guide introduces Linux as a stable, open‑source server OS, explains its hierarchical directory layout, covers common command‑line operations, file permission concepts, useful shortcuts, and provides a concise overview of the powerful Vim editor for efficient text editing.
Discover a curated list of ten indispensable, free, open‑source Linux applications—from package managers and media players to office suites and security tools—each with key features, usage tips, and direct download links to enhance your Linux desktop experience.
CentOS 8 has been officially released, mirroring RHEL 8 with a 4.18 kernel, DNF package manager, updated programming languages, GCC 8.2, newer database servers, and a shift to nftables, while offering upgrade instructions, source‑code access, and links to official download resources.
This guide compares eight popular Linux distributions—Elementary OS, Linux Mint, Arch/Antergos, Ubuntu, Tails, CentOS, Ubuntu Studio, and openSUSE—highlighting their target audiences, key features, strengths, and drawbacks to help readers choose the most suitable distro for their personal or professional use.
This article explains what Linux load average measures, how to read the 1‑, 5‑, and 15‑minute values, what they indicate on single‑core and multi‑core systems, and which thresholds should raise alerts for system performance monitoring.
This article explains the concepts of Linux user groups and file permissions, demonstrates how to create groups and users, and provides detailed command examples (groupadd, useradd, chgrp, chown, chmod) for managing ownership and access rights on files and directories.
The article analyzes a rare blocking issue in a Python Agent where a subprocess created via subprocess.Popen hangs due to an unclosed pipe inherited by a forked child process, demonstrates debugging steps using thread frames and lsof, and provides a reproducible example and mitigation recommendations.
This comprehensive guide presents essential Bash and command‑line techniques for Linux, macOS, and Windows, covering basic navigation, file manipulation, process management, networking, one‑liners, obscure utilities, and platform‑specific tips, along with practical code snippets and references to further resources.
This guide walks you through essential Linux server monitoring tools—top, vmstat, pidstat, iostat, netstat, sar, and tcpdump—explaining each metric, how to interpret CPU, memory, disk, and network statistics, and offering practical tips for troubleshooting performance bottlenecks.
This guide shows how to use Ansible to automate the mass installation and configuration of Zabbix‑agent on both Linux and Windows hosts, covering key‑based SSH authentication, playbook creation, service management, and Zabbix auto‑discovery setup.
This article documents a multi‑stage investigation of intermittent GitLab Runner build timeouts and hangs, describing the background, VM configuration, successive diagnostic steps using strace, iotop, perf, and storage‑driver adjustments, and concludes with performance test results and lessons learned.
This article surveys the most prominent Linux‑derived operating systems for the Internet of Things, detailing their origins, real‑time capabilities, hardware requirements, and the ecosystems that support them, while highlighting the fragmentation and future prospects of Linux in IoT.
This article explains Docker’s lightweight container technology, contrasts it with traditional virtual machines, outlines its core components and architecture, and provides step‑by‑step installation instructions for Windows, macOS, and Linux, empowering developers to streamline environments and deployment.
This guide explains why Linux may fail to boot, then walks through using single‑user mode, correcting common GRUB configuration errors, and employing Linux rescue mode with concrete commands and examples to restore a broken system.
This guide outlines a practical roadmap for Linux newcomers, covering the purpose of learning, essential command‑line tools, recommended resources, habits for working in the shell, Unix‑style thinking, and key skills like Shell scripting, Python, DevOps, and cloud automation.
This guide details the prerequisites, step‑by‑step installation methods (WAR, macOS, Windows, Linux/Docker), and post‑installation configuration of Jenkins, including unlocking, plugin management, user creation, update site configuration, slave node setup, and configuration file locations.
This comprehensive guide walks you through MySQL optimization philosophy, risk management, stakeholder involvement, practical tools, hardware and system tuning, kernel parameter adjustments, and detailed MySQL configuration tweaks to achieve both performance gains and reliable stability in production environments.
