This article introduces ten open‑source Linux command‑line tools—including bat, duf, tldr, htop, glances, exa, fd, ag, axel and pydf—explaining how to install them on various distributions, showcasing their key features and usage examples, and demonstrating how they can improve everyday system administration tasks.
This article reviews the classic Linux top command, explains its syntax, options, and interactive keys, then presents eleven modern alternatives—bashtop, bpytop, btop, bottom, glances, gotop, gtop, htop, nvtop, vtop, and zenith—detailing their features, installation methods, and usage examples for effective system monitoring.
ssar is Alibaba’s open‑source system performance monitoring tool that extends traditional sar capabilities with comprehensive machine‑level, process‑level, and load metrics, offering rapid development, flexible configuration, and advanced diagnostics such as load5s, thread analysis, and custom Python query extensions for detailed OS troubleshooting.
This article explains the Linux top command syntax, options, and interactive hotkeys, interprets its output, and then presents a curated list of contemporary replacements—including bashtop, bpytop, btop, bottom, glances, gotop, gtop, htop, nvtop, vtop, and zenith—along with their key features, installation steps for various distributions, and basic usage examples.
Vivo’s vmonitor system replaces its legacy RabbitMQ‑based pipeline with an HTTP‑driven collector and gateway, stores minute‑level JVM, system, and business metrics in a customized OpenTSDB on HBase, adds precise floating‑point handling and null‑aware aggregation, buffers data in Redis, and provides multi‑dimensional alerts comparable to Zabbix, Open‑Falcon, and Prometheus.
This guide explains the Linux vmstat command, covering its syntax, each output field, common options, practical usage examples, memory unit conversion, active versus inactive memory, fork counting, time column addition, wide‑mode display, and disk‑partition statistics, helping you diagnose system bottlenecks efficiently.
This guide introduces Sysdig, an open‑source system monitoring tool for Linux, explains its integration, powerful filtering, custom output formats, file capture, chisel extensions, and container support, and provides practical command examples for everyday troubleshooting and analysis.
This article presents a Bash script that performs a full daily health check on a Linux server—covering disk usage, memory, CPU, processes, file changes, user logins, network settings, services, cron jobs, and security configurations—and then emails the generated report.
Learn how to use the Linux watch command to run any command at regular intervals, customize its behavior with options like -n, -d, and -t, and see practical examples such as monitoring memory usage and tracking file changes.
The article outlines a rapid, one‑minute health check for Linux servers using ten common command‑line tools—uptime, dmesg, vmstat, mpstat, pidstat, iostat, free, sar, and top—to quickly reveal CPU, memory, I/O, network saturation and error conditions before deeper analysis.
An in‑depth guide walks through essential Linux server monitoring tools—top, vmstat, pidstat, iostat, netstat, tcpdump and others—explaining each command’s output, key metrics, and how to interpret CPU, memory, disk and network statistics for effective troubleshooting and performance tuning.
This step‑by‑step guide shows how to create a Windows‑like Task Manager using Python's Tkinter GUI library and the psutil module, covering project setup, menu creation, button layout, real‑time system metrics, and code snippets for full implementation.
This article outlines a systematic approach to diagnosing and optimizing application performance, covering background concepts, a four‑step workflow, common pitfalls, and a comprehensive toolbox of Linux and Java utilities, while emphasizing practical analysis techniques for CPU, memory, disk, and network bottlenecks.
This article explains what Linux load average actually measures, distinguishes it from CPU utilization, describes runnable and uninterruptible states, and demonstrates its behavior through CPU‑intensive, I/O‑intensive, and high‑process‑count scenarios using common monitoring tools.
This guide explains how to install the uptimed daemon on various Linux distributions, enable and start its service, and use the uprecords command with its many options to view detailed system uptime, boot, and downtime histories.
This guide shows Linux users how to retrieve detailed CPU information—including model, frequency, physical and logical core counts, and hyper‑threading status—by querying /proc/cpuinfo with simple command‑line filters.
This article compiles a comprehensive set of Linux shell commands for server health checks—from file cleanup and process inspection to network, disk, and memory monitoring—followed by a handy collection of regular expressions for common validation tasks.
Learn how to effectively use the Linux time command—including its basic output, the meaning of real, user, and sys values, differences between shell built‑ins and GNU time, and advanced options like -p, -v, -o, -f—to accurately measure program performance and diagnose bottlenecks.
This article explains what the Linux Load Average metric means, how the three numbers are calculated, and walks through each line of the top command output—including CPU, memory, swap, and process details—to help you diagnose server load issues effectively.
This case study outlines iQIYI's LEDAO middle‑platform monitoring challenges, evaluates open‑source solutions, details the selection and customization of CAT, and presents deployment, integration, health‑check, and alerting enhancements that now support over 100 microservices across multiple regions.
This guide explains how to install the sar (System Activity Reporter) tool on Ubuntu, describes its syntax and options, and provides detailed examples for monitoring CPU, memory, I/O, and network metrics, plus an overview of the ksar graphical front‑end.
This guide walks through essential Linux server monitoring tools—top, vmstat, pidstat, iostat, netstat, sar, and tcpdump—explaining their output fields, what each metric reveals about CPU, memory, disk I/O, and network performance, and how to use them for effective troubleshooting and capacity planning.
This article introduces four widely used Linux monitoring utilities—iotop, htop, IPTraf, and Monit—explaining their core features and how they help quickly diagnose system performance and network issues for effective operations management.
This guide explains how to use common Linux monitoring utilities—top, vmstat, pidstat, iostat, sar, netstat, and tcpdump—to observe CPU, memory, disk I/O, and network performance, interpret their output, and troubleshoot system bottlenecks effectively.
Learn how to monitor Linux server performance using essential tools—top, vmstat, pidstat, iostat, netstat, sar, and tcpdump—understanding CPU, memory, disk I/O, and network metrics, interpreting their outputs, and applying insights to diagnose and troubleshoot system issues effectively.
Amid microservice and distributed architectures, this article explains how to design a comprehensive log analysis system—covering collection, storage, consumption, key data points, collection methods, and practical use cases like automated test generation, issue localization, and real‑time exception monitoring—to ensure system stability.
This article explains the Linux uptime command, describing its purpose, basic syntax, available options, common usage examples, and deeper concepts such as system load average, CPU core considerations, and how to retrieve related information from /proc files.
The article introduces duf, a Go‑based disk usage and free space viewer for Unix‑like systems, explains its features such as colored, resizable output, sorting and JSON mode, and provides step‑by‑step installation instructions for Debian/Ubuntu, RPM‑based distros, Arch AUR, Termux, macOS, FreeBSD, and Windows, plus usage examples and customization options.
This guide introduces duf, a Golang‑based command‑line utility that displays disk usage across Linux, macOS, BSD, Android and Windows, explains its key features, provides step‑by‑step installation methods for various distributions, and demonstrates common usage options and output formats.
This article provides a thorough, step‑by‑step guide to using the Linux sar command for real‑time and historical monitoring of CPU, memory, I/O, and network statistics, including syntax, sample outputs, installation tips, common pitfalls, and data‑export techniques.
This article explains common awk built‑in variables such as OFS, NR, and NF, demonstrates practical awk one‑liners for extracting and formatting /etc/passwd data, and shows how to use netstat (and ss) together with awk to monitor network connection states on a Linux system.
This guide introduces several Linux performance monitoring tools—nmon, perf, top, iostat, sar, dstat, and htop—explaining their functions, key metrics, and installation commands for use on a Huawei Kunpeng server. It also shows how to generate flame graphs with perf and highlights htop's interactive advantages.
This article introduces the powerful cross‑platform psutil module, explains how to install it, demonstrates basic commands to list processes, retrieve CPU usage, and explore various useful methods, all illustrated with clear code snippets and screenshots.
Auditing Linux system operations can be streamlined by applying filtering rules to exclude noisy cron and daemon logs, avoiding sensitive command exposure, and choosing appropriate recording methods—such as history, custom bash, snoopy, auditd, or eBPF—each with distinct advantages, limitations, and configuration examples.
This guide introduces thirteen practical Linux utilities—ranging from network bandwidth monitors and disk I/O testers to security hardening and terminal multiplexing tools—complete with installation commands, usage examples, and key options to help system administrators efficiently monitor, diagnose, and optimize their servers.
This guide introduces thirteen practical Linux utilities—including Nethogs, IOZone, IOTop, IPtraf, IFTop, HTop, NMON, MultiTail, Fail2ban, Tmux, Agedu, NMap, and Httperf—covering their purpose, installation commands, key options, and example usage for effective system monitoring and troubleshooting.
This article compiles a comprehensive set of Linux shell commands for deleting zero‑byte files, inspecting processes, sorting by memory or CPU usage, checking URLs, network connections, system load, disk space, logs, and includes a handy collection of common regular expressions for text processing.
This guide explains why terminal enthusiasts need system resource monitoring, introduces the efficient visual tool Bpytop, and provides step‑by‑step instructions for preparing prerequisites, installing via source or package managers, running, customizing, and locating its configuration file.
This article presents a comprehensive, practical case study of diagnosing and resolving high‑concurrency performance issues in an SSM‑based e‑commerce system, covering architecture overview, problem identification, root‑cause analysis, JVM/Tomcat/Redis/MySQL tuning, load‑balancing, and post‑optimization monitoring results.
This article presents a thorough overview of MySQL optimization, covering the query execution process, philosophical principles, risk assessment, required participants, optimization dimensions, commonly used diagnostic tools, emergency and regular tuning procedures, hardware and system level adjustments, as well as detailed configuration parameters for both the server and the database engine.
Tencent’s Eagle Eye distributed real‑time monitoring and log analysis platform was migrated to the cloud by rebuilding its LogSender and Kafka‑to‑ES components, switching to cloud CKafka and Elasticsearch, which boosted throughput fourfold, cut resource usage by about half, saved roughly 20 million RMB annually, and set the stage for further enhancements such as comprehensive monitoring and exactly‑once delivery.
This tutorial demonstrates how to use Python's platform module and /proc filesystem to gather Linux system and hardware information, format it into a report, extend the script to send the report via SMTP email, add timestamps, and schedule periodic execution with cron.
This article provides an extensive overview of monitoring in operations, covering its objectives, methods, core concepts, a wide range of open‑source and commercial tools, detailed metric categories, alerting mechanisms, interview tips, and recommendations for building a robust, scalable monitoring ecosystem.
This guide walks you through Linux’s top command, explaining its default output—including system uptime, load averages, task summary, CPU states, memory usage, and column fields—while detailing the full set of interactive keys and command‑line options for real‑time process monitoring and management.
This guide explains the Linux top command in depth, covering its default output fields, how to interpret system uptime, load averages, task summaries, CPU and memory statistics, as well as the full set of interactive keys and command‑line options for customizing monitoring.
This article introduces a systematic approach to diagnosing Linux performance issues, covering the 5W2H analysis framework, essential CPU, memory, disk I/O and network monitoring tools, practical command examples, flame‑graph generation, and a real‑world nginx case study with actionable insights.
Feature flags enable controlled system changes, allowing teams to observe business and technical impacts, retain beneficial updates, quickly roll back harmful ones, and continuously learn through a fast feedback loop that guides subsequent modifications.
This article explains why the memory reported by ps RSS differs from the free command, walks through interpreting free -m output, demonstrates clearing caches, and shows how to account for process RSS, slab allocations, and PageTables to reconcile total used memory on Linux systems.
This guide introduces key Linux commands—such as uptime, who, uname, du, df, free, pmap, vmstat, ifconfig, ip, netstat, top, and pstree—to help you quickly assess system status, resource usage, and process relationships, enabling effective troubleshooting and maintenance.
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 article introduces key Linux monitoring utilities—top, vmstat, pidstat, iostat, netstat, sar, and tcpdump—explains the meaning of their output fields, and shows how to use them to diagnose CPU, memory, disk, and network performance issues on production servers.
This article provides a comprehensive, step‑by‑step explanation of how Linux load averages are calculated, how to dissect them with scripts like load2process, and how to use kernel modules and monitoring techniques for precise performance analysis and troubleshooting.
This article provides a collection of practical Bash scripts for generating random strings, colorized output, batch user creation, package and service checks, host ping monitoring, CPU/memory/disk utilization alerts, website availability testing, and MySQL replication status verification, all useful for Linux system administration and interview preparation.
This guide presents a collection of practical Bash snippets for Linux administrators, covering random string generation, colored output, batch user creation, package and service checks, host ping testing, CPU/memory/disk monitoring, remote disk usage, website availability, and MySQL replication status verification.
This guide shows how to use the built‑in Linux commands script and scriptreplay to capture complete terminal sessions—including timestamps, command output, and playback speed control—plus tips for silent recording, real‑time monitoring, and automatic logging on user login.
This article details how MaFengWo’s payment center evolved from a simple 1.0 implementation to a robust 2.0 architecture, covering core capabilities, modular design, monitoring, and the operational lessons learned for building a high‑availability, scalable payment platform.
This guide introduces the open‑source Duc tool, explains its supported interfaces and database back‑ends, provides step‑by‑step installation instructions for Debian‑based and source builds, and demonstrates core commands for indexing, querying, and visualizing disk usage on Linux.
This guide introduces key Linux commands—lshw, lscpu, lsusb, lsscsi, lspci, df, and free—explaining how to retrieve detailed hardware specifications, CPU details, USB devices, storage information, PCI components, disk usage, and memory statistics, complete with example outputs.
This guide walks you through essential Linux performance diagnostics—checking CPU details, boot‑time services, CPU load, free memory, and disk I/O—providing concrete commands, interpretation tips, and practical solutions to identify and resolve common slowdown causes.
This article explains the meaning of the Linux uptime/top output, defines system load average as the average number of runnable and uninterruptible processes, distinguishes it from CPU utilization, and provides guidance on interpreting load values for single‑core and multi‑core systems.
This guide presents practical Bash scripting techniques—including precautions, random string generation, color output functions, bulk user creation, package checks, service status verification, host liveness testing, resource monitoring, disk usage audits, and website availability checks—to help you automate Linux system administration tasks effectively.
This guide walks you through Linux command‑line shortcuts, the five key system‑operation metrics, and powerful tools like smem, ps, and sort to efficiently monitor CPU, memory, processes, disks, and network while also handling zombie processes.
This guide explains how to use Linux’s watch command to repeatedly execute a program, customize the interval, highlight output changes, exit on updates, react to non‑zero exit codes, and suppress the header, providing practical examples for each option.
This article introduces thirteen practical Linux operation tools—including Nethogs, IOZone, IOTop, IPtraf, IFTop, Fail2ban, and more—providing concise descriptions, download links, and step‑by‑step installation commands to help system administrators monitor performance, network traffic, and protect against attacks.
This article explains what a command‑line interface (CLI) is, weighs its advantages and disadvantages, shares personal insights on learning it, demonstrates basic commands, and provides a detailed walkthrough of the powerful Linux "top" monitoring tool to illustrate how mastering the CLI can dramatically improve efficiency.
This article provides a comprehensive guide to MySQL optimization, covering the underlying query process, risk-aware philosophy, practical troubleshooting steps, hardware and system tuning, essential monitoring tools, and detailed configuration adjustments to improve performance and stability in production environments.
This article provides a comprehensive guide to MySQL optimization, covering the underlying query process, philosophical considerations, practical troubleshooting steps, hardware and system tuning, essential tools, and detailed configuration adjustments to achieve stable and high‑performance database operations.
This article explores the advantages and drawbacks of using a command-line interface, explains why proficiency boosts efficiency, and provides a practical introduction to essential commands, including a detailed walkthrough of the powerful "top" monitoring tool.
The article explains the discrepancy between the file‑handle count reported by /proc/sys/fs/file‑nr and the numbers shown by lsof, clarifying the difference between file descriptors and file handles, describing how the kernel allocates struct file objects, and showing how shared memory, mmap, and other operations can inflate handle counts unnoticed by lsof.
This guide walks you through Linux’s top command, explaining its real‑time output—including system load, tasks, CPU and memory usage—and details every interactive key (h, d, f, k, etc.) and command‑line option for customizing displays, sorting, and managing processes.
This guide introduces the dstat command as a versatile, color‑enhanced replacement for vmstat, iostat, netstat, nfsstat and ifstat, covering installation via yum or direct download, core usage, common options, field explanations, example outputs, plugin extensions, and CSV export for further analysis.
This article provides a comprehensive guide to MySQL optimization, covering the query process, risk‑aware philosophy, collaborative participation, multi‑layer optimization dimensions, essential diagnostic tools, system‑level tuning, hardware recommendations, and key database configuration tweaks to achieve stable and high‑performance database operations.
Discover a collection of practical Bash script snippets covering random string generation, colored output functions, batch user creation, package and service checks, host reachability, CPU/memory/disk monitoring, remote disk usage collection, and website availability testing, with essential scripting best‑practice tips.
This article presents a curated list of twenty Python libraries and tools—including psutil, IPy, dnspython, scapy, Ansible, and SaltStack—that help with system monitoring, resource management, network automation, configuration management, and other operational tasks, providing brief descriptions and key use cases for each.
This article explains what Linux load average measures, how to view the 1‑, 5‑, and 15‑minute values, interprets the numbers using traffic analogies, presents stress‑test scenarios across different CPU cores, and shows how load average guides effective troubleshooting of CPU and I/O bottlenecks.
Discover a comprehensive collection of 80 essential Linux monitoring tools, ranging from system resource visualizers like nmon and Glances to log analyzers such as GoAccess, each described with features, usage tips, and links, helping sysadmins efficiently track performance, diagnose issues, and maintain robust infrastructure.
This guide explains how Linux root users can instantly track any command executed by other users using Bash history files, the w command, and the powerful Sysdig tool, including installation steps and example outputs.
This article explains how Lianjia designed and implemented LTrace, a zero‑intrusion, high‑performance distributed tracing system that captures full request chains across heterogeneous services, supports multi‑language environments, offers flexible sampling, and enables rapid fault isolation and performance optimization.
This guide compiles essential Linux command‑line techniques—from searching and editing with vi/vim, using pipelines, file finding, string replacement, redirection, permission changes, to monitoring system resources and network connections—helping operations engineers boost productivity and maintain high service availability.
This article explains the fundamental time units of system performance, outlines various measurement dimensions and tools, and guides readers through analysis, profiling, and improvement techniques to achieve high‑performance, reliable applications.
This article explains how to use the Linux top command for real‑time system and process monitoring, covering its interface, statistical and process sections, interactive shortcuts, command‑line options, and internal commands to customize and sort the displayed information.
Beats are lightweight data shippers in the ELK Stack, and this guide details the purpose, key features, and integration of Filebeat for log collection, Metricbeat for system and service metrics, Packetbeat for network traffic analysis, Winlogbeat for Windows event logs, and Heartbeat for service uptime monitoring.
This article walks through a real‑world SQL Server case study, explaining how to assess system hardware, interpret performance counters and wait statistics, identify CPU, memory, disk and indexing issues, and apply a three‑stage optimization process to dramatically improve database performance.
Learn the essential concepts of Linux processes, including their lifecycle, various states, key management commands like ps, top, kill, and pgrep, and how to interpret process information from /proc, enabling effective system monitoring and control.
This report details the performance testing of the 360 Endpoint Security Management System, covering product overview, architecture, tool selection (favoring LoadRunner), test scenarios, script implementation, execution results, resource utilization, and analysis, concluding with insights on testing methodology and optimization.
This guide explains how to install, configure, and use the dstat command on Linux to monitor CPU, disk, network, memory, and system metrics in real time, including syntax, common options, example outputs, CSV export, and plugin extensions.
Discover a curated list of 12 powerful Linux command-line utilities—from lsof and htop to Suricata and vnStat PHP—that help system and network administrators monitor files, processes, I/O, network traffic, and security, enabling efficient troubleshooting and performance optimization across diverse Unix environments.
This article provides a comprehensive overview of the Linux sar command, explaining its syntax, common options, example use‑cases for CPU, memory, I/O and process monitoring, and how to interpret the output fields to identify system bottlenecks.
This guide presents twenty indispensable Linux/Unix command‑line tools—from top and vmstat to Nagios and Collectl—that enable system and network administrators to monitor processes, memory, I/O, network traffic, and overall performance, helping quickly identify and resolve performance issues across any Linux distribution.
This article presents a curated list of 18 command‑line tools for Linux/Unix administrators, explaining how each utility—such as top, vmstat, lsof, tcpdump, and Nagios—helps monitor system performance, diagnose issues, and maintain reliable server operations.
This guide explains essential Linux audit commands, log‑viewing techniques, user and process inspection methods, and additional checks such as file integrity, network monitoring, cron jobs, and backdoor detection, providing a comprehensive toolkit for system security and operations.
This article explains why log analysis platforms are essential as systems grow, outlines the benefits of centralized logging, presents Ctrip’s real‑world requirements and challenges, and introduces the ELK stack as a scalable solution for collecting, storing, and visualizing massive log data.
Ensuring uninterrupted network performance is critical for multi‑level organizations, and this guide compiles twelve free network monitoring solutions—such as Fiddler, Nagios, NeDi, EasyNetMonitor, Microsoft Network Monitor, Cacti, Zenoss, PRTG, BandwidthD, Icinga, The Dude, and Total Network Monitor—detailing their key features, capabilities, and visual interfaces to help IT teams select the right tool for reliable, secure operations.
Using strace to trace the Linux ‘top’ command reveals that it reads a wealth of system information from the virtual /proc filesystem, where files like cpuinfo, meminfo, stat, and others provide real‑time metrics that power top’s monitoring display.
This guide explains how to install, configure, and use the sar (System Activity Reporter) tool on Linux to monitor CPU, memory, I/O, and load metrics, helping you pinpoint performance bottlenecks through various command options and detailed reports.
This guide explains how to install the sar tool on various Unix-like systems, configure its data retention and collection intervals, export performance metrics in formats such as CSV, XML, and JSON, and visualize the results using built‑in or third‑party graphing utilities.
This article introduces dstat, a versatile Linux monitoring tool that consolidates vmstat, iostat, and ifstat functions, demonstrates its default and customizable outputs, shows how to identify top resource‑consuming processes, and provides simple installation steps for CentOS.
Learn how to list all processes, filter by user, sort by CPU or memory usage, display top results, and visualize process hierarchies using Linux's ps command suite, with clear examples and screenshots to help you master system monitoring.
The Linux ‘w’ command provides a richer view of system load than ‘uptime’, displaying average load over 1, 5, and 15 minutes, detailed information about logged‑in users, their CPU usage, current activity, and offers guidelines for interpreting load values on single‑ or multi‑CPU systems.
Explore a comprehensive collection of sysdig command examples that let you monitor network bandwidth, container resources, HTTP traffic, disk I/O, CPU usage, performance bottlenecks, and security events, with ready-to-use snippets for Linux systems and containerized environments.
