Saturday, March 23, 2019

Microservices - Client side load balancing with Ribbon

Greetings!

In my previous post I introduced Feign REST client with hard coded (or single) URL. We can improve it using Ribbon.
Ribbon is a client side load balancer which not only provides load balancing feature but also support caching, fault tolerance.

Source code can be found at github.


Add Ribbon library

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>

Update properties

Update cart-service.yml
catalog-service:
  ribbon:
    listOfServers: localhost:8010,localhost:8011

Update Fiegn Client

@FeignClient(name = "catalog-service")
@RibbonClient(name = "catalog-service")
public interface CatalogServiceFeign

Restart the cart service and test the application. Remember to push the configuration changes to github.

References

https://github.com/Netflix/ribbon
https://cloud.spring.io/spring-cloud-netflix/multi/multi_spring-cloud-ribbon.html

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