Key Components of a Microservice Architecture: Nginx, Gateway, Service Registry, Cache, Database, Messaging, Logging, Scheduling, and Object Storage

Microservice architectures are widely adopted, and this article provides a concise overview of the most common backend components that form a robust system.

Traffic entry – Nginx: Nginx serves as the external gateway, handling routing, load balancing, and static‑dynamic separation, typically deployed in multiple nodes with keepalived for high availability.

Gateway: Positioned after Nginx, the gateway (e.g., Spring Cloud Gateway) performs request authentication, routing, protocol conversion, and traffic monitoring. Alternatives such as Zuul, Kong, etc., are mentioned.

Business services: The micro‑services layer includes domain‑specific services like account, order, invoice, and cashier services, communicating via Feign with Ribbon for client‑side load balancing.

Service registry: A central registry (Zookeeper, Eureka, Nacos) registers all services to enable dynamic discovery; Nacos is recommended for its dual role as a configuration center.

Cache and distributed lock – Redis: Redis is used for hot‑data caching and as a distributed lock mechanism, with high‑availability achieved through Sentinel or cluster mode.

Data persistence – MySQL: Relational data is stored in MySQL with master‑slave and read‑write separation; scaling strategies such as sharding are discussed.

Structured data storage – Elasticsearch / MongoDB: For non‑relational or search‑heavy data, Elasticsearch (with DSL and GIS support) or MongoDB are suggested.

Message middleware: Asynchronous communication between services is handled by RabbitMQ or RocketMQ to ensure reliable message delivery.

Log collection – ELK stack: Logs from distributed nodes are aggregated using Filebeat → Logstash → Elasticsearch, with Kibana providing visualization and search.

Task scheduling: Distributed scheduling solutions such as Quartz (with DB), Elastic‑Job, and XXL‑JOB are introduced for reliable timed tasks.

Distributed object storage: Files are stored using MinIO, Alibaba OSS, or FastDFS to avoid local server storage limitations.

The article also includes promotional links and community invitations, but the technical sections serve as a practical guide for designing and operating a modern backend microservice system.