How to find IPs of Eureka registered service on the clients

Question

I have the following services:

• EurekaServer - hosts the eureka discovery server
• Client-service - registers to EurekaServer
• Finder-service - registers to EurekaServer

Is there a way to get Client-service's ip so I can make requests to it from the Finder-service.

I know there is a way to find InstanceInfo from EurekaServer and I was thinking of making a controller in eureka server where you pass service id and get service's instance ip. This way Finder-service would only need to know service id and eureka ip which it knows because it is registered there.

Is there another solution which is cleaner than this?

Answer 1

To use client discovery you first need to enable by adding either @EnableEurekaClient or @EnableDiscoveryClient to your @SpringBootApplication annotated class (or your specialized @Configuration).

Next to make use of the resolution of the actual service instance to use you need to create a RestTemplate which is load-balanced. This will add an interceptor which translates the service name into the ip-address / DNS name to send the request to (if multiple instances are found it will distribute the load between those instances).

To create a load balanced RestTemplate add the @LoadBalanced annotation to the configured RestTemplate.

@Bean
@LoadBalanced
public RestTemplate restTemplate(RestTemplateBuilder rtb) {
    return rtb.build();
}

Now when doing a request through the RestTemplate it will resolve the service name client-service to the actual service instance to use. Without you having to do anything.