Loadbalancing fails when a server is down

Question

I have written a simple set of micro-services with the following architecture:

For all, I have added spring-boot-starter-actuator in order to add /health endpoint.

In Zuul/Ribbon configuration I have added :

zuul:
  ignoredServices: "*"
  routes:
    home-service:
      path: /service/**
      serviceId: home-service
      retryable: true

home-service:
  ribbon:
    listOfServers: localhost:8080,localhost:8081
    eureka.enabled: false
    ServerListRefreshInterval: 1

So that, each time client will call GET http://localhost:7070/service/home, loadbalancer will choose one of two HomeService which runs on 8080 or 8081 port and will call its endpoint /home.

But, when one of HomeService is shutdown, the loadbalancer does not seem to be aware (in spite of ServerListRefreshInterval configuration) and will fail with error=500 if it tries to call the shutdown instance.

How could I fix it?

Loadbalancing fails when a server is down

2 Answers