Practice together, never alone. We cover programming languages, development tools, learning methods, and pitfall notes. We simplify complex topics, guiding you from beginner to advanced. Weekly practical content—let's grow together!
This guide explains Elasticsearch clusters—from fundamental concepts and node roles to health monitoring, scaling strategies, security measures, and practical command‑line tips—helping you build, operate, and optimize a resilient, high‑performance search infrastructure.
This article explores Kubernetes' core components—API Server, Controller Manager, Scheduler, and etcd—detailing their source‑code architecture, key mechanisms, extension points, performance tips, and practical steps for building operators, custom schedulers, and API extensions.
An in‑depth look at Kubernetes’ control plane reveals how the API Server, Scheduler, and Controller Manager work together to manage cluster state, handle authentication, schedule pods, and ensure convergence, with practical HA tips, advanced features, and real‑world deployment workflows.
This guide presents ten core Linux commands—grep, find, awk, sed, ssh/scp, systemctl, netstat/ss, tar, rsync, and jq—along with practical command‑line combos, automation scripts, safety tips, and advanced troubleshooting tools to help sysadmins diagnose issues, manage files, and streamline production workflows efficiently.
This guide walks through diagnosing intermittent 502 Bad Gateway errors in Nginx by analyzing error logs, checking upstream and FastCGI timeout settings, reviewing PHP‑FPM configuration, performing performance tuning, and outlining advanced troubleshooting, monitoring, and capacity‑planning strategies to ensure stable high‑traffic deployments.
This guide presents a comprehensive, step‑by‑step roadmap for accelerating slow SQL queries without altering the original statements, covering index creation, database parameter tuning, table partitioning, caching layers, read‑write splitting, sharding, statistics updates, hardware choices, and middleware routing.
Netty services can accumulate CLOSE_WAIT sockets when the server fails to close its side of the socket, leading to resource exhaustion and potential service collapse; this article explains the TCP state machine, common code pitfalls, kernel tuning, defensive handlers, and a comprehensive checklist to prevent and resolve the issue.
This guide breaks down five common QPS measurement techniques—from load balancer logs and Java instrumentation to APM tools and database metrics—detailing their principles, pros and cons, real‑world pitfalls, and provides Java code examples and optimization strategies for accurate, real‑time monitoring.
This guide outlines a complete backend architecture for high‑volume GPS data, detailing the overall system flow, technology stack choices, Maven dependencies, data models, Kafka producer/consumer configurations, SpringBoot controllers, asynchronous processing, Redis caching, health checks, Docker deployment, and performance tuning recommendations to ensure stability and scalability.
This article recounts the migration from a simple HTTP polling approach to an MQTT‑based real‑time communication architecture, detailing the motivations, technical comparisons, implementation steps, performance gains, operational challenges, and future directions for scalable event‑driven systems.
