This guide explains why Nacos generates massive access logs, shows how to disable the Tomcat access log via configuration, provides a cron script for log cleanup, demonstrates dynamic log‑level adjustment through API calls, and details fine‑grained logback settings for better log management.
This article explains core Linux I/O concepts—including file systems, I/O types, caching mechanisms, copy‑on‑write, zero‑copy, and performance metrics—then presents practical application, file‑system, and disk‑level optimization techniques to improve throughput and latency.
This tutorial walks through installing Docker CE on CentOS, then pulling and running Elasticsearch and Kibana containers, configuring Kibana, and setting up the Cerebro monitoring tool, providing all necessary commands and configuration snippets for a complete ELK stack deployment.
Learn how to create temporary and permanent Linux aliases to replace lengthy commands, streamline file synchronization with rsync, manage aliases via the alias and unalias commands, and store them in dedicated files for persistent shell customization.
This article explains Kubernetes' deprecation of Docker, introduces containerd as a lightweight, industry‑standard runtime, and provides step‑by‑step instructions for installing, configuring, and operating containerd on Linux, including common CLI commands for managing images and containers.
This comprehensive guide walks you through Docker fundamentals, compares virtual machines to containers, explains core concepts, shows step‑by‑step installation, image building, container execution, and best practices, enabling you to containerize a Vue project and deploy it with Nginx effortlessly.
This article explains the differences between epoll's level‑triggered (LT) and edge‑triggered (ET) modes, shows how to use epoll_create, epoll_ctl, and epoll_wait, provides complete C++ examples for read and write handling, and offers practical guidance on avoiding common pitfalls in high‑performance Linux network programming.
Learn how to install and configure Samba on Linux, covering the service’s history, required packages, daemon processes, main configuration file settings, command‑line tools, SELinux integration, and step‑by‑step client and server setup for Windows and Linux file sharing.
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 article introduces the command‑line utility q, explains how to install it on Linux and Windows, and demonstrates using full SQLite‑compatible SQL syntax to query, filter, join, and aggregate plain‑text log files, offering a database‑style alternative to traditional shell tools.
This article provides a comprehensive, hands‑on guide to building a MySQL master‑slave cluster with GTID replication and configuring MHA for automatic failover, covering environment preparation, password‑less SSH, MySQL settings, MHA installation, custom scripts, testing, and the key advantages of the solution.
This article explains the object‑oriented design of the Linux VFS, details the four core VFS structures, shows how ext4 is registered and mounted via register_filesystem and ext4_mount, and walks through the six‑step ext4_fill_super process for initializing superblocks and related metadata.
A comprehensive, categorized list of essential Linux commands covering system information, file management, process control, networking, package handling, disk operations, backups, and text editing, providing quick reference examples and usage syntax for everyday system administration tasks.
This article provides a comprehensive reference of Linux commands, explaining their purpose and usage across categories such as file management, system monitoring, networking, user administration, and process control, helping readers efficiently manage and troubleshoot Linux systems.
This guide explains the NFS protocol fundamentals, activation steps, version comparisons, and provides a step‑by‑step CentOS 7 installation and configuration tutorial, including service setup, firewall adjustments, export file editing, and client mounting procedures.
Learn step-by-step how to create a reliable MySQL database backup solution by writing a shell script, compressing the dump, assigning execution permissions, and scheduling it with cron to run automatically, while covering storage media choices, disk space checks, and verification of the backup process.
This article explains the four core parts of a Linux system—kernel, shell, filesystem and applications—covering memory and process management, VFS architecture, file types, directory hierarchy, partitioning, mounting, links and essential command‑line tools.
This article explains the core concepts of Linux virtual memory, including why it exists, how paging and page tables work, the role of the MMU, swap usage, common pitfalls, and practical commands for inspecting and tuning memory behavior on a Linux system.
This tutorial explains how to download a CentOS 7 Docker image, run it as a lightweight Linux virtual machine, map ports and directories, access the container's shell, and export or import the container as an image for easy migration across hosts.
This guide walks through installing rsync on CentOS and demonstrates nine real‑world examples—including local directory sync, preserving timestamps, remote transfers, avoiding overwrites, progress monitoring, deletion, include/exclude patterns, and size limits—complete with commands, output, and key options.
This article explains why the ELK stack is useful for large‑scale log collection and analysis, then provides detailed installation, configuration, and integration steps for Elasticsearch, Logstash, and Kibana on both macOS and Linux, including common pitfalls and memory‑tuning tips.
On Linux, the client port used in a TCP connection is selected either by the kernel during the connect system call—randomly scanning the ip_local_port_range while respecting reserved ports—or by a prior bind call, with detailed kernel functions such as inet_hash_connect and __inet_hash_connect governing the process.
This article compiles a comprehensive list of open‑source Linux applications, covering audio players, chat clients, backup and recovery utilities, desktop customization themes, development IDEs, e‑book managers, editors, educational software, email clients, file managers, games, graphics tools, browsers, office suites, productivity helpers, security utilities, file‑sharing services, terminal emulators, miscellaneous utilities, video players, and other useful programs.
Learn how Linux selects the next process for CPU execution by exploring key scheduler structures such as task_struct, sched_class, runqueue, the various scheduling policies (CFS, RT, Deadline, etc.), the scheduling flow, and the low‑level context_switch mechanism that swaps address spaces and registers.
This article explains the difference between CPU utilization and CPU load, describes how to interpret these metrics, and provides practical Linux commands and step‑by‑step methods for diagnosing high load with low utilization or vice versa, including common I/O and indexing issues.
The article explains how MySQL uses different memory areas such as Thread Memory, Sharing, and InnoDB Buffer Pool, describes the impact of large user tables on query performance, and shows that when a table size exceeds the InnoDB buffer pool capacity, sharding becomes necessary.
This tutorial walks through building a three‑node UCloud lab, installing ipvsadm, configuring NAT and TUNNEL load‑balancing modes with LVS, adjusting routing and ARP settings, and verifying the setup using ipvsadm commands and curl requests.
This guide walks through upgrading GCC, extracting and installing Redis 6.2.4 on a Linux server, configuring a systemd service, verifying the installation, and provides basic performance tuning tips such as adjusting max connections, memory settings, data compression, and clustering.
Learn how Linux’s non‑blocking I/O mechanisms such as select, poll, and epoll enable high‑concurrency servers, explore OpenResty’s Lua‑based architecture, and follow step‑by‑step instructions for installing, configuring, and troubleshooting a performant OpenResty/Nginx environment on Linux.
This guide provides a comprehensive overview of the FTP protocol and its lightweight counterpart TFTP, then walks through installing, configuring, and securing the vsftpd service on Linux, covering active and passive modes, authentication options—including anonymous, local, and virtual users via text files or MySQL—and essential SELinux and firewall adjustments.
This guide explains why large files often need to be divided for network transfer on Linux, and provides step‑by‑step commands and options for using the split utility to cut files into smaller pieces and the cat command to recombine them efficiently.
The article walks through Linux’s mmap file‑read workflow—from the kernel entry point and VMA creation, through page‑fault handling that allocates pages and invokes synchronous or asynchronous readahead, to munmap’s unmapping steps and the deferred file‑cache reclamation mechanisms.
This tutorial walks you through why ELK is essential for large‑scale log collection, shows a simple architecture diagram, and provides detailed installation and configuration steps for Elasticsearch, Logstash, and Kibana on both macOS and Linux, including common pitfalls and Java integration.
This step‑by‑step tutorial shows how to enable security groups, configure firewall ports, install the BT panel or use the command line to set up a Linux server, then install JDK, Tomcat, and Docker CE with all required commands and configurations.
This article explains how Docker volumes work, how to mount host directories into containers using the -v and --mount options, and demonstrates data persistence by creating a volume, inspecting its storage location, and verifying that files created inside the container appear on the host.
An intermittent 403 error caused by nginx reuseport misrouting on a shared IP was traced to kernel listener hash table ordering; upgrading the Linux kernel from 4.14 to 4.16+ resolved the issue by prioritizing IP+PORT over INADDR_ANY lookups.
This guide explains time‑zone fundamentals, compares ntpd and ntpdate, and provides step‑by‑step commands to install, configure, secure, and verify NTP services on Linux, ensuring reliable and precise system time across servers.
Linux users often need more than a single terminal window, so this guide compares four popular terminal multiplexers—tmux, GNU Screen, Konsole, and Terminator—evaluating their splitting, stacking, control keys, package size, and hacker-friendly features to help you choose the best tool for your workflow.
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 explains the fundamentals of virtual memory in Linux, covering its purpose, paging and page tables, address translation, swap usage, common questions about 32‑ vs 64‑bit systems, direct memory access, JVM memory consumption, and essential commands for monitoring and configuring memory.
This article explains what Docker is, its underlying architecture—including namespaces, cgroups, and union file systems—its client‑server model, its core concepts such as images and containers, its installation methods, a step‑by‑step Koa hello‑world example, and how to migrate containers using export and import commands.
This comprehensive tutorial explains what tcpdump is, how it differs from Wireshark, walks through its core parameters, output format, common and advanced filtering rules, optional flags, and provides dozens of practical command‑line examples for precise packet capture on Unix systems.
This article explains the Linux kernel scheduler's core concepts, walks through the initialization code of the 5.4 kernel (including run queues, scheduling classes, domains, and groups), and details how multi‑core and NUMA topologies are handled to achieve balanced CPU usage.
This comprehensive guide lists the 21 most frequently used Linux commands—from navigating directories and managing files to searching, text processing, compression, system shutdown, and process control—providing a handy cheat‑sheet for developers and system administrators alike.
This guide introduces exa, a Rust‑based, open‑source file‑listing tool that adds Git integration, colorized output, tree views, and parallel scanning to replace the classic ls command, and shows how to install and use it across major Linux distributions and macOS.
This guide explains the three Unix file timestamps, shows how to view them with stat, and demonstrates using the find command’s ‑newerXY option to locate files modified, accessed, or status‑changed after a specific date and time.
This article demystifies the three common Linux commands—ln, mv, and cp—explaining how they differ in handling inodes, dirents, and data blocks, when they create links or move files, and why their performance varies across file systems and file types.
This article explains how Linux manages physical address space using SMP and NUMA architectures, describes the node, zone, and page data structures, details page allocation via the buddy system and slab allocator, and outlines user‑ and kernel‑mode page‑fault handling, swapping, and address translation mechanisms.
This guide walks you through installing Kafka on CentOS, configuring Zookeeper, using command‑line tools, setting up the Kafka‑Eagle visual interface, and integrating Kafka with a Spring Boot application, providing code snippets and step‑by‑step instructions for a quick start.
Learn how to completely uninstall any existing MySQL, install MySQL 8.0 via dnf or yum, verify the installation, configure it to start on boot, manage root passwords, and set up remote access with Navicat, all with clear commands and screenshots.
This article explains Linux virtual memory fundamentals, covering its purpose, paging and page tables, address translation, swap usage, common issues like 32‑bit vs 64‑bit limits, and practical commands such as free, vmstat, pmap, and sysctl for monitoring and configuring memory management.
This guide explains the Linux source command, covering its syntax, how to refresh the current shell environment, execute scripts within the same session, import functions, and read variables from other scripts, with practical examples and command-line illustrations.
This article explains how to use Maven profiles to manage multiple Spring Boot environments, configure the maven‑assembly‑plugin to create a zip release containing the jar, configuration files and a custom shell script, and then deploy and control the application on Linux using the provided shenniu_publish.sh tool.
This comprehensive guide explains what HAProxy is, its core features and performance, how to install and configure it for L7 and L4 load balancing, implement health checks, session persistence, monitoring, and achieve high availability with Keepalived on Linux systems.
This article provides a detailed, step‑by‑step guide to Linux's built‑in performance monitoring utilities—top, free and vmstat—covering their purpose, essential options, output interpretation, interactive shortcuts, and practical examples for effective system administration.
This guide introduces Axel, a lightweight command‑line download accelerator for Linux, covering installation across major distributions, key configuration options, and performance comparisons with wget that demonstrate significantly faster FTP and HTTP downloads using multiple simultaneous connections.
This article explains the principles of Linux file systems using clear diagrams and the simple MINIX file system as a teaching example, covering hard‑drive basics, file and directory structures, inode layouts, formatting layout, and step‑by‑step file‑reading procedures.
This article explains the purpose of the TCP TIME_WAIT state, how it prevents packet loss and connection errors, examines its duration based on the Maximum Segment Lifetime, and analyzes why high‑QPS load testing tools like ab may appear to bypass TIME_WAIT, revealing the impact on server resources.
This article uses vivid analogies to explain the concepts of physical memory, virtual memory, and Linux's paging mechanism, showing how operating systems abstract hardware resources to simplify programming while managing limited RAM through disk-backed storage.
This guide explains why the ls command shows a fixed 4 KB size for directories, introduces the du (disk usage) utility, and provides step‑by‑step examples for obtaining total, per‑directory, per‑file, and cumulative size information using various du options.
This comprehensive guide explains what HAProxy is, its core functions and key features, then walks through installing, configuring, and running both L7 and L4 load balancers on Linux, adding logging, log rotation, monitoring, and achieving high availability with Keepalived.
This article provides a detailed walkthrough of the Calico CNI plugin source code, explaining how the calico and calico‑ipam binaries are built, how the ADD command creates WorkloadEndpoint objects, veth pairs, routes, and sysctl settings, and how these components integrate with the Calico datastore in a Kubernetes environment.
This article provides a comprehensive overview of Linux's core components—including the kernel, shell, virtual file system, various filesystem types, directory hierarchy, disk partition schemes, mounting procedures, and linking mechanisms—while illustrating key concepts with commands, code snippets, and diagrams for practical system administration.
This comprehensive guide walks through Linux memory management, explaining CPU memory access, virtual‑to‑physical address translation, page‑table initialization, zone organization, the buddy allocator, slab allocator, vmalloc, page‑fault handling, and CMA, providing code examples and diagrams to form a complete understanding.
This article explains how Linux manages virtual memory by describing the organization of virtual and physical address spaces, the mechanisms of segmentation and paging, multi‑level page tables, and the layout of user‑mode and kernel‑mode memory, including relevant kernel code examples.
This guide explains how to troubleshoot firewalld command errors, enable VRRP multicast traffic, and fix VIP migration problems in a Keepalived high‑availability setup on CentOS 7, providing step‑by‑step commands, configuration file adjustments, and verification procedures.
This article explains Linux scheduling fundamentals, describing the task_struct fields, scheduling classes, runqueue organization, the scheduling workflow including flag setting and execution, and the details of the context_switch function that performs address‑space and register state switches.
This article explains why Linux imposes resource limits, shows how to inspect user‑level limits with ulimit, demonstrates practical experiments to increase file‑descriptor and stack limits via /etc/security/limits.conf, and outlines system‑wide constraints and tools like prlimit for robust server programming.
This article explains how infrared remote controls work, details the NEC protocol timing and encoding, and walks through the Linux kernel driver implementation—including GPIO‑IR receiver code, NEC decoder logic, device‑tree configuration, and key‑event reporting—providing a complete technical guide for developers.
This step‑by‑step guide shows how to install Ruby, add the Scout_Realtime gem, start its daemon, configure firewall access, view real‑time metrics in a web browser, and manage logs, stopping or uninstalling the tool on Linux servers.
This article provides a comprehensive tutorial on installing UCloud's free USDP version for private big‑data deployments, covering environment preparation, minimum node specifications, resource download, configuration files, one‑click initialization scripts, server startup, web UI access, license acquisition, and optional manual setup procedures.
This guide walks you through practical steps to secure a Linux server, covering SSH configuration changes, disabling ping replies, managing users and groups, protecting critical files, creating new accounts, and safely granting root privileges.
This comprehensive guide walks you through selecting a secure Linux distribution, configuring kernel and sysctl parameters, applying boot‑time hardening, managing network and firewall rules, restricting root access, enabling MAC policies, sandboxing applications, and employing advanced memory and entropy techniques to dramatically improve system privacy and resilience against attacks.
This guide walks you through installing the GeoIP2 dependencies, adding the ngx_http_geoip2 module to NGINX, upgrading NGINX, downloading the latest GeoIP2 database, configuring NGINX to block non‑Chinese IPs, and verifying the setup with test requests.
This guide explains how to use the Linux date command together with mkdir or touch to automatically generate directories or files whose names reflect the current date or time, providing handy shortcuts for log management and other automation tasks.
This guide explains how to automate Linux tasks by configuring boot‑time services with chkconfig and rc.local, using the at command for one‑off jobs, and setting up recurring jobs with crontab, complete with syntax, examples, and practical shell script integration.
This article explains the Linux PM QoS framework, detailing its background, system‑ and device‑level constraints, core data structures, key API functions, and a practical example of limiting CPU‑DMA latency for power‑efficient device operation.
This article explains why Docker containers often stop right after starting, covering the role of PID 1, daemon‑off mode, Linux process management concepts like zombie and orphan processes, and how Docker’s containerd‑shim and runC interact to keep containers alive.
vmalloc allocates virtual memory by mapping non‑contiguous physical pages into a contiguous virtual address range, using vmap_area and vm_struct structures, and follows a three‑step process of finding a hole, allocating pages, and establishing the mappings, with details on its data structures and region layout.
This guide introduces a free PowerShell wrapper for rsync that enables seamless file synchronization between Windows and Linux machines, detailing script features, system requirements, download links, and usage examples for both directions of transfer.
The article outlines why high‑load Go services need performance tuning and presents a systematic workflow—preparation, analysis with Linux tools and Go’s pprof/trace, targeted optimizations such as goroutine pooling, Redis MSET, efficient JSON handling and slice resizing—demonstrating how these changes boost throughput, lower latency, and stabilize memory usage while offering broader Go‑specific best‑practice recommendations.
This article provides a deep, step‑by‑step analysis of how Linux 3.10 processes a send() call—from user‑space socket handling through TCP, IP routing, queueing, driver DMA mapping, and both hard and soft interrupt handling—answering why CPU time appears in sy/si, why NET_RX softirqs dominate, and what memory copies occur during transmission.
This article introduces the Linux `time` command, explains its basic usage and output fields (real, user, sys), distinguishes between shell built‑in and GNU versions, demonstrates advanced options such as custom formatting, file output, and shows how to interpret the metrics for performance analysis.
This guide explains what Base64 encoding is, why it’s needed for transmitting binary data as text, and provides step‑by‑step command‑line examples for encoding and decoding strings, files, and user input with practical Bash scripts.
A practical guide warns developers to breathe, verify servers, back up data, and follow strict habits when using risky commands like rm -rf, chmod, dd, and MySQL to prevent catastrophic data loss in production environments.
This comprehensive guide explains how to dramatically improve Linux security and privacy by selecting hardened distributions, configuring kernel and boot parameters, applying sysctl tweaks, disabling unnecessary services, using MAC frameworks, sandboxing applications, hardening memory allocation, and following best‑practice system administration steps.
This guide explains what Linux Load Average represents, how to read each field of the top command output—including CPU, memory, and process details—and offers practical tips for diagnosing server performance issues using additional tools like vmstat and iostat.
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.
A tech roundup reveals a former actor turned PhD, exposes a massive Amazon paid‑review fraud, extends Linux 5.10 LTS support to 2026, details Edge’s false Firefox block, showcases Google’s new Chrome media controls, and announces China’s 62‑qubit programmable quantum prototype.
This guide walks through checking the current kernel version, adding the ELRepo repository, listing and installing newer kernels on CentOS 7, configuring GRUB to boot the new kernel, and then provides a parallel step‑by‑step process for upgrading the kernel on Ubuntu 16.04, including troubleshooting dependency issues.
This tutorial walks through Linux library management, demonstrating how to build and inspect static (.a) and shared (.so) libraries, configure runtime search paths with LD_LIBRARY_PATH, customize linker behavior, and handle multi‑architecture library locations using practical command‑line examples.
This article provides a detailed tutorial on the Linux find command, covering how to locate files by name, type, size, time, and permissions, combine conditions, execute actions, and compare it with the locate utility, offering practical examples for system administrators.
This guide explains how to relocate Docker's storage directory to a larger disk on a CentOS system, covering disk addition, partitioning, formatting, mounting, copying data, updating the Docker daemon configuration, and verifying container operation after migration.
This guide walks you through safely stopping, removing, and reinstalling GitLab CE on a Linux server, covering dependency installation, configuration tweaks, port management, firewall settings, and essential GitLab commands for daily administration.
This guide walks you through installing AutoKey on Linux, configuring its UI, creating typo‑fix phrases, setting window filters, assigning hotkeys, and writing Python scripts to automate repetitive typing tasks, helping you streamline your workflow and reduce keystroke effort.
This article explains how Linux stores file metadata in inodes, demonstrates the differences between hard and soft links through practical experiments, and provides a detailed walkthrough of the inode structure and its associated VFS operation functions.
This guide introduces the most important Linux terminal commands—pwd, ls, cd, mkdir, man, touch, nano, and rm—explaining their usage, syntax, and practical tips so developers can navigate, manage files, and work confidently in a shell environment.
This guide provides a comprehensive, step‑by‑step walkthrough of the Linux performance monitoring tools top, free, and vmstat, covering command syntax, useful options, real‑world examples, output interpretation, and practical tips for effective system tuning and troubleshooting.
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.
