Microservices with springcloud

This project demonstrates microservices architectural pattern using the spring boot and spring cloud.

Spring cloud compnents:

• Eureka Server - Open source service discovery server.

• Microservices

  • Product Service
  • Coupon Service

• Zuul API gateway

  • Helps put all the crossing cutting concerns in one single place like security,tracing and service aggregation and rate limits.

  • Zuul is just another microservice and it will register itself with Eureka.

  • API gateway as a single point of entry for all front end clients.

  • Zuul automatically gives us server side load balancing using Ribbon internally.

  • When invoking microservices from front end clients like Angular, invoke using this format https://<servername>:8765/microservice-name/uri where 8765 is port for Zuul gateway server and microservice name is the name of the microservice registered under the Eureka naming server.

• Feign

  • Develop rest clients using Feign instead of RestTemplate.

  • Eg. Coupon service is invoked from Product Service using Feign.

  • Helps avoid hardcoding of URLs.

• Hystrix

  • Used for fault tolerance.

  • Is integrated within the product service.If coupon service is down, then product service handles errors gracefully.

  

  

  • Sleuth and Zipkin

     * Used for request tracking.
     
     * Zipkin provides a dashboard to view the trace of a http request.
    

• Config Server

  • Used for centralized configuration management
  • Requires the installation and running of Rabbit MQ .
  • Can refresh client properties for all microservice instances by using the actuator endpoint - http://localhost:9090/actuator/bus-refresh