Ray's Galactic Tech
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Ray's Galactic Tech

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!

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Recent Articles

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Ray's Galactic Tech
Ray's Galactic Tech
Jan 10, 2026 · Operations

Master 10 Essential Linux Commands and Powerful Combinations for Everyday Ops

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.

Command LineMonitoringshell scripting
0 likes · 14 min read
Master 10 Essential Linux Commands and Powerful Combinations for Everyday Ops
Ray's Galactic Tech
Ray's Galactic Tech
Jan 9, 2026 · Operations

Why Does Nginx Return 502 Bad Gateway? A Complete Log‑to‑FastCGI Timeout Diagnosis

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.

502NginxPerformance
0 likes · 9 min read
Why Does Nginx Return 502 Bad Gateway? A Complete Log‑to‑FastCGI Timeout Diagnosis
Ray's Galactic Tech
Ray's Galactic Tech
Jan 7, 2026 · Backend Development

Why Netty Servers Accumulate CLOSE_WAIT Connections and How to Fix Them

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.

CLOSE_WAITConnection ManagementJava
0 likes · 8 min read
Why Netty Servers Accumulate CLOSE_WAIT Connections and How to Fix Them
Ray's Galactic Tech
Ray's Galactic Tech
Jan 6, 2026 · Backend Development

Scalable GPS Data Backend: SpringBoot, Kafka, MongoDB & Redis Design

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.

DockerKafkaMongoDB
0 likes · 11 min read
Scalable GPS Data Backend: SpringBoot, Kafka, MongoDB & Redis Design
Ray's Galactic Tech
Ray's Galactic Tech
Jan 5, 2026 · Backend Development

How We Replaced HTTP Polling with MQTT for Real‑Time, Low‑Latency Messaging

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.

MQTTbackend architectureevent-driven
0 likes · 8 min read
How We Replaced HTTP Polling with MQTT for Real‑Time, Low‑Latency Messaging