Implementing Discovery Server in SpringBoot | Service Discovery | Microservices

We have 3 microservices for our Hotel Rating Application →

• UserService - http://localhost:8081/users

• HotelService - http://localhost:8082/hotels

• RatingService - http://localhost:8083/ratings

Here we will try to implement Service Discovery mechanism for out Hotel Rating application by creating a Discovery Server.

Step 1 → Create a springboot microservice named DiscoveryServer with following dependencies -

• Cloud Bootstrap | SPRING CLOUD

• Eureka Server | SPRING CLOUD DISCOVERY (Netflix Eureka Server)

<!-- Spring cloud version needs to be provided inside the <properties> -->
<properties>
  <java.version>17</java.version>
  <spring-cloud.version>2023.0.3</spring-cloud.version>
</properties>

<!-- Dependencies -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter</artifactId>
</dependency>

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

<!-- Spring Cloud will also require this <dependencyManagement> -->
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring-cloud.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

Step 2 → Enable Eureka server by adding @EnableEurekaServer

package com.movie_rating.ServiceRegistry;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class ServiceRegistryApplication {

    public static void main(String[] args) {
        SpringApplication.run(ServiceRegistryApplication.class, args);
    }

}

Step 3 → Adding configuration in properties file. There are 2 important configuration properties here -

• eureka.instance.hostname=localhost → to configure hostname

• eureka.client.register-with-eureka=false → StartFragmentIndicates whether or not this instance should register its information with eureka server for discoveryEndFragment

• eureka.client.fetch-registry=false → StartFragmentIndicates whether this client should fetch eureka registry information from eureka server.EndFragment

spring.application.name=ServiceRegistry

server.port=8090

eureka.instance.hostname=localhost
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false

We have now setup our Discovery Server. We can run our Discovery Server to get this interface -

But since we haven’t registered any Client microservice yet, we aren’t getting any applications displayed.

Let’s discuss how to setup and register our Client microservices in our Discovery Server in the next article - Implementing Service Discovery Client in SpringBoot | Microservices