This guide explains how to obtain and install the Windows 11 25H2 (Build 26200.5074) update via the Release Preview channel, detailing the enablement package, required system requirements, step‑by‑step installation, and post‑upgrade verification.
When memory usage approaches 90‑95% of capacity, Linux often raises CPU load and stalls instead of invoking OOM, but Alibaba Cloud's FastOOM adds proactive user‑space killing to prevent Near‑OOM livelocks and keep services responsive.
This comprehensive guide outlines six critical areas of modern system operations—including real‑time monitoring, security safeguards, automation, fault diagnosis, collaborative teamwork, and process optimization—offering practical strategies and tools such as Zabbix, Prometheus, ELK, Redis, Ansible, and capacity planning to ensure stable, efficient enterprise services.
This guide explains how to use the iostat command to monitor Linux disk I/O, interprets its key metrics, compares I/O behavior to everyday queueing, and offers practical solutions for performance problems based on real output samples.
This guide walks you through using the classic top command, its more user‑friendly successor htop, and the modern btop tool—covering installation, key shortcuts, UI modules, configuration files, and theme customization for effective process and system monitoring on Unix‑like systems.
The article reviews the historical development, distributed architecture, high‑concurrency handling, and operational challenges of China's 12306 railway ticketing platform, highlighting its evolution from early Unix‑based systems to the modern large‑scale, real‑time service that supports hundreds of millions of users during peak travel periods.
This guide explains how to use iostat and related Linux commands to monitor I/O performance, interpret key metrics such as %util, await, and svctm, and apply practical analysis and optimization techniques for diagnosing and resolving storage bottlenecks.
This guide explains how to verify disk alerts, locate large directories and files using df, du, and find commands, handle discrepancies caused by deleted files, and adjust system-reserved space to efficiently free up disk space on Linux servers.
This article details the design and implementation of a highly available membership system that handles billions of users and peak traffic of over 20,000 TPS, covering Elasticsearch dual‑center master‑slave clusters, traffic‑isolated three‑cluster architecture, Redis caching with distributed locks, and dual‑center MySQL partitioning.
This article details a comprehensive performance‑testing case study of an inventory‑reservation system, describing the test scenarios, bottleneck analysis, Redis‑based cache redesign, re‑testing results, cache‑preheat strategies, invalid‑call reduction, and operational best practices that together increased TPS by over twenty‑three‑fold while keeping latency under 500 ms.
This article clarifies the often‑confused concepts of system stability, high availability, reliability and availability, explains their metrics such as MTBF, MTTR and MTTF, and shows how they interrelate to guide engineers in building resilient services.
This comprehensive guide demystifies the Linux find command, covering its basic syntax, the four expression types (tests, actions, global and positional options), common parameters for time, user, permission, path, size, as well as advanced operators and safe exec usage.
The International Bureau of Weights and Measures announced the phase‑out of leap seconds, a practice that has caused system crashes and NTP headaches for major tech firms, and the decision—effective by 2035—will reshape how global time synchronization is handled in operations.
This article explains system performance concepts such as throughput and latency, describes how to design and run performance tests, outlines methods for locating bottlenecks at the OS, code, network, and database levels, and presents practical optimization techniques ranging from algorithmic improvements to I/O and TCP tuning.
This article explains how to monitor Linux system performance by covering CPU metrics with top and vmstat, memory usage via top columns and cache details, I/O health using iostat and zero‑copy techniques, as well as network statistics with sar, providing practical commands and interpretation guidance.
This guide introduces a collection of entertaining Linux command-line utilities—including figlet for ASCII art text, aafire for flame effects, fortune for random quotes, yes for repeated output, sl for a steam locomotive, cowsay for talking cows, cmatrix, asciiquarium, asciiview, hollywood, ninvaders, and bastet—detailing their installation via yum or apt and example usage commands.
Learn how the Linux ss utility provides faster, more detailed socket statistics than netstat, covering TCP/UDP listings, state filtering, process association, and practical command examples, while explaining why ss reads kernel data directly for superior performance in system monitoring.
This guide explains how the nohup command lets you run Linux programs without hanging up, redirects output to nohup.out or a specified file, and provides common options and practical examples for background execution and output redirection.
On October 4, a faulty maintenance command disabled Facebook’s DNS servers and severed its global backbone network, causing a seven‑hour outage that affected billions of users, highlighted architectural flaws, and underscored the need for redundant DNS and better operational safeguards.
This guide explains how to install tmux on CentOS, create and name sessions, detach and reattach them, list existing sessions, and use keyboard shortcuts to open, switch, split, and close windows, providing practical commands and visual examples for seamless terminal multiplexing.
This guide explains how to use the open‑source Crash utility to analyze Linux kernel vmcore dumps, covering supported dump formats, step‑by‑step installation from source, essential debugging parameters, common Crash commands, and building and using extension modules such as trace and gcore.
bashtop is a Bash‑written Linux resource monitor that visualizes CPU, memory, disk, network and process usage, offers a game‑inspired UI with fast navigation, configurable settings, and real‑time graphs, and is available on GitHub with detailed configuration examples and usage instructions.
This article explains what Dex2OAT is, why ahead‑of‑time compilation improves Android performance, the related file formats, command‑line usage, log analysis, system configuration, the internal call flow in Android Q, and practical optimization strategies for smoother app experiences.
The 12306 railway ticket platform faces extreme operational pressure because it must synchronize real‑time sales across online and offline channels, handle countless route and time combinations without buffering, manage complex inventory updates, enforce purchase limits, and process massive concurrent queries, making its load far greater than typical e‑commerce systems.
This tutorial walks you through the complete process of fixing network settings on a CentOS virtual machine cloned in vSphere, covering hostname changes, MAC address updates, network‑script edits, udev rule adjustments, and service restarts to restore connectivity.
This article explains how the Linux nohup command lets a process continue running after the terminal is closed, demonstrates it with an infinite-loop PHP script, and clarifies why the jobs command cannot list background tasks across different sessions.
A tiny typo—a stray space in an ifconfig command—changed a node's IP to 0.0.0.0, triggering IPC errors, instance eviction, and a full Oracle RAC restart, illustrating why meticulous command entry and privileged‑user discipline are critical in system operations.
This article explains common Linux shell pitfalls that lead to accidental directory or file removal—such as empty variables, spaces in paths, special characters, and failed cd commands—and provides practical safeguards like quoting, parameter expansion checks, set -u, logical short‑circuiting, and friendly prompts, while also highlighting real‑world database‑deletion incidents.
This article explains the evolution of the second, the definitions of UT, TAI and UTC, why leap seconds are needed, their impact on critical IT systems, and details Alibaba's innovative approach of splitting the extra second into 86,400 parts to maintain seamless global time synchronization.
The article explains the historical definition of the second, the concept of leap seconds, their impact on large‑scale IT systems, and details Alibaba's multi‑step approach of splitting the extra second into 86,400 parts to maintain accurate time synchronization across its infrastructure.
This article explains how Wonder's log monitoring system works, covering rolling count, string and numeric matching types, the underlying Go implementation with tail reading, alert strategies, and future enhancements for handling large log files.
This guide walks you through checking NTP status, viewing peers, manually syncing time, starting and enabling the NTP daemon at boot, verifying auto‑start, and customizing NTP servers to keep clocks consistent across many web servers.
The article explains the concept of a leap second, its scheduling by the IERS, the operational impact on large IT systems, and details Alibaba's technical strategy—including testing, time‑distribution methods, and team coordination—to guarantee a seamless transition during the 2015 positive leap second.
