Microservices Part Creating Service Registry Application

Building a Microservices Application: Creating a Service Registry

To build a microservices application, you'll first need a service registry – a specialized microservice that maintains a list of registered microservices. This process involves six steps.

Step 1: Creating the Service Registry Microservice

We'll build the service registry using the spring-cloud-starter-netflix-eureka-server dependency. The pom.xml file will look like this:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>3.4.1</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.sky</groupId>
  <artifactId>service-registry</artifactId>
  <version>1.0</version>
  <name>service-registry</name>
  <description>Registry for Job Portal Application</description>
  <url> </url>
  <licenses>
    <license/>
  </licenses>
  <developers>
    <developer/>
  </developers>
  <scm>
    <connection/>
    <developerConnection/>
    <url/>
  </scm>
  <properties>
    <java.version>21</java.version>
    <spring-cloud.version>2024.0.0</spring-cloud.version>
  </properties>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <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>
  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

Step 2: Enabling the Eureka Server

The ServiceRegistryApplication.java file requires the @EnableEurekaServer annotation:

package com.sky.service_registry;

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

@SpringBootApplication
@EnableEurekaServer
public class ServiceRegistryApplication {

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

}

Step 3: Service Registry Configuration

The application.properties file needs these settings to prevent the service registry from registering itself as a microservice:

spring.application.name=service-registry
server.port=8761

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

Step 4 - 6: Registering a New Microservice

These steps detail adding a new microservice and registering it with the service registry. This involves adding the spring-cloud-starter-netflix-eureka-client dependency, configuring the Eureka server URL, and verifying registration via the Eureka Server URL (https://www.php.cn/link/0ae12dc3676bc09a35fe6ed96926a6b5).

This concludes the initial setup. Further details on microservices will be covered in subsequent posts.

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