An operations lab passionate about server tinkering 🔬 Sharing automation scripts, high-availability architecture, alert optimization, and incident reviews. Using technology to reduce overtime and experience to avoid major pitfalls. Follow me for easier, more reliable operations!
This guide shows how to set up Docker Engine and Docker‑Compose on isolated Linux machines without internet access by downloading static binaries, transferring them, and running a ready‑made Bash script that configures, starts, and verifies the installation in just a few steps.
This guide explains why Docker can rapidly fill storage, shows how to pinpoint the biggest space consumers, and provides tiered, production‑ready cleanup commands, automation scripts, and monitoring setups to keep container environments healthy and efficient.
This guide shows how to automatically download the latest APNIC IP allocation list, generate Nginx allow rules for Chinese IP ranges, configure the server to permit only those addresses, and set up daily updates, providing a free, low‑overhead way to block foreign traffic.
This article compiles concise, high‑scoring answers to essential operations interview questions, covering security hardening, intrusion response, high‑availability architecture, disaster‑recovery design, Redis replication and clustering, Docker fundamentals and networking, Kubernetes components, monitoring, CI/CD pipelines, and the evolving role of DevOps.
This article provides interview‑ready, step‑by‑step explanations of how Nginx works with Tomcat, the benefits of static‑dynamic separation, essential Nginx modules and load‑balancing algorithms, plus detailed MySQL master‑slave replication, failover, backup strategies, and related database concepts.
This guide presents the most common operations interview questions—covering Linux mounting, filesystem issues, server performance, networking fundamentals, RAID, load balancing, and web server configuration—along with detailed, high‑scoring answers that showcase systematic thinking, troubleshooting logic, and production‑grade awareness.
This guide presents three practical, production‑grade methods to dynamically block IP addresses in Nginx—using OpenResty with Redis for millisecond response, fail2ban with log analysis for automated bans, and a pure‑shell file‑watch approach—each with step‑by‑step installation, configuration, and usage instructions.
When servers become sluggish, fail to start, or run out of disk space, blindly restarting only masks the problem; this guide compiles ten critical Linux commands with usage scenarios to help you quickly pinpoint CPU, memory, port, disk, swap, and network issues for effective troubleshooting.
TIME_WAIT is a normal TCP state designed to prevent stray packets, but high volumes can indicate inefficient connection handling; this guide explains its mechanics, common causes, monitoring commands, and practical kernel and application-level tuning strategies to reduce TIME_WAIT buildup in high‑traffic services.
This guide explains why accurate server time is critical, compares ntpd with Chrony, and provides a single‑command script that automatically detects the OS, disables old ntpd services, installs Chrony, configures public or private NTP servers, and verifies synchronization across CentOS, Ubuntu, and CTyunOS.
