10.1 Spring Cloud

What is Spring Cloud?

Spring Cloud is a set of tools built on top of Spring Boot for building distributed microservices systems.

Overview

• Spring Cloud is part of the Spring Boot ecosystem.

• It provides libraries and tools to build, configure, and manage microservice-based applications.

  • Makes microservices easier to manage, monitor, and scale.
  • Enables communication and coordination among services.

• It is not a cloud platform like AWS, GCP, or Azure — instead, it helps you build cloud-ready applications.

Spring Cloud Core Components

Component	Purpose
Eureka	Service registry
Spring Cloud Gateway	API gateway / routing
Config Server	Centralized configuration
Resilience4j	Circuit breaker
Sleuth	Distributed tracing
Zipkin	Trace visualization
Spring Cloud Stream	Messaging

Common Architecture Flow

Client -> API Gateway -> Eureka Discovery -> Microservices  
        -> Config Server -> Central Config Repo
        -> Zipkin / Sleuth -> Tracing
        -> Kafka/RabbitMQ -> Async Events