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Nginx Load Balancing for Microservices — Configuration, Strategies, and Observability
How to configure Nginx as a reverse proxy and load balancer for multiple Spring Boot instances — with least_conn strategy, custom logging, health checks, and real-time routing observability.
Master Nginx load balancing for microservices with this practical guide. Learn least_conn strategy, upstream configuration, custom logging for routing observability, Docker health checks, and production-ready proxy settings.
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In the coupon redemption system, Nginx sits at the front of three Spring Boot instances, routing every API request to the least-loaded server. This article explains every line of the Nginx configuration, why least_conn beats round-robin for variable-length requests, and how to make load balancing visible.
Why Nginx for Microservices?
When you have multiple application instances, you need a single entry point that:
- Distributes traffic — no single instance gets overwhelmed
- Hides internal topology — clients only know one URL
- Handles failures — if an instance goes down, routes to healthy…
