Focused on sharing practical Linux technology content, covering Linux fundamentals, applications, tools, as well as databases, operating systems, network security, and other technical knowledge.
This article walks through common CORS errors encountered when a frontend on http://localhost:8080 calls a backend on http://localhost:59200, explains the role of the four CORS response headers, the preflight OPTIONS request, and provides step‑by‑step Nginx configurations to resolve each case.
The article explains how Direct Memory Access (DMA) eliminates CPU‑bound data copies, compares traditional I/O with zero‑copy techniques such as mmap and sendfile, and shows how reducing system calls and context switches can double file‑transfer throughput while highlighting the limits of kernel cache for large files.
This article presents a systematic methodology and a curated set of Linux tools—including CPU, memory, disk I/O, network, load monitoring, and flame‑graph techniques—illustrated with a real‑world nginx case study to help engineers quickly locate and resolve performance issues.
This guide introduces five Linux file‑comparison utilities—diff, colordiff, wdiff, vimdiff, and sdiff—detailing their core syntax, useful options, installation steps, and practical examples so readers can choose the right tool for any diffing task.
Bashtop is a visually appealing, terminal‑based Linux resource monitor that displays CPU, memory, processes and network bandwidth, offers sortable process lists, supports SIGKILL/SIGTERM/SIGINT signals, and can be installed via manual git build, snap, APT, DNF, Pacman, or other package managers across Ubuntu, Debian, Fedora, CentOS, and Arch, with configurable settings and help menus.
This article walks through expanding a Linux server’s root filesystem by checking disk usage, adding a new disk, creating a physical volume, extending the volume group and logical volume, and resizing the XFS filesystem, with commands and screenshots for each step.
This article provides a thorough overview of Rsync, covering its algorithm, supported platforms, key features, usage in both SSH and daemon modes, detailed configuration options, practical command examples, cron‑based automation, and real‑time syncing with inotify‑tools.
GET and POST are two of the eight HTTP request methods; this article explains their request‑line, header and body structures, compares their characteristics such as safety, idempotence, caching, length limits and TCP packet usage, and clarifies why HTTP distinguishes them despite sharing the same underlying protocol.
This article walks through using Windows command‑line loops to batch‑ping large IP ranges, showing how to iterate subnets, capture results in files, separate reachable from unreachable hosts, and handle arbitrary IP lists for efficient network troubleshooting.
This article presents 40 practical Bash shell script examples ranging from a basic Hello World program to file management, conditionals, loops, functions, and system maintenance, each illustrated with clear code snippets and step‑by‑step explanations for Linux users.
