Distributed High-Availability Ingress Architecture in Practice Series

别再让入口网关成为单点故障 | Nginx + Keepalived + Golang

A complete hands-on guide to building a highly available gateway with Nginx + Keepalived + Golang from scratch. It covers VRRP protocol principles, Gin health check service implementation, Nginx upstream health checks and circuit breaker configuration, Keepalived VIP failover deployment, drills for four failure scenarios, split-brain solutions, a Docker Compose local simulation environment, and integration practice with a distributed scanning engine. Includes complete code and automated test scripts, ready to use.

Chapter 1

Why Does Your Distributed System Need a High-Availability Entry Point? — From Single Point of Failure to VIP+Nginx Architecture Evolution Starting from a production incident at 3 a.m., compare the essential difference between direct IP connection and VIP+Nginx. Understand with one diagram how a high-availability entry point solves single points of failure, and why it is the first line of defense for distributed systems.

Chapter 2

Detailed Explanation of Nginx + Keepalived Core Principles: VRRP Protocol, Master-Backup Switchover, and VIP Drift An accessible and thorough explanation of the underlying VRRP protocol mechanism: heartbeat broadcasting, priority preemption, and MAC address migration. After reading, you will be able to explain clearly how Keepalived makes the IP "float."

Chapter 3

Golang Gin Hands-On Practice: Building a "Talking" Health Check Service in 50 Lines of Code Build a web service in Go from 0 to 1 that can report its local IP and hostname. Supports Docker Compose three-node simulation, and the code can be copied directly into your production project.

Chapter 4

Nginx upstream Health Check and Passive Circuit Breaking Configuration Hand-write production-grade Nginx configuration: dynamically removing failed nodes in upstream, active health checks, and passive circuit breaking mechanisms. Includes a general-purpose gateway configuration template ready to use.

Chapter 5

Complete Guide to Keepalived Deployment: VIP Drift, Master-Backup Switchover, and Health Check Scripts Deploy Keepalived on three machines from scratch, configure VRRP master-backup switchover, and achieve automatic VIP drift. Includes complete installation steps, configuration details, health check script integration, and failover verification.