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Connecting Microservices to Eureka

To connect microservices to an Eureka Naming Server, you need to configure your microservices as Eureka clients. This involves adding the necessary dependencies and configuration to enable the microservices to register themselves with the Eureka server and discover other services. Below are the steps to connect microservices to an Eureka Naming Server using Spring Cloud, which is a popular framework for building microservices in the Java ecosystem:

1. Add Dependencies:

In your microservice projects, add the following dependencies to your build file (typically pom.xml for Maven or build.gradle for Gradle):



This dependency includes the necessary libraries for integrating your microservice with Eureka.

2. Configure Application Properties:

In each microservice’s application.properties or application.yml file, specify the Eureka server’s location:

    name: your-service-name
    serviceUrl:  defaultZone
    : http://eureka-server-host:8761/eureka/

  • your-service-name is the name of your microservice.
  • eureka-server-host is the hostname where the Eureka Naming Server is running.

3. Annotate the Application Class:

In your microservice’s main application class, annotate it with @EnableEurekaClient. This annotation registers the microservice with Eureka and enables service discovery.

					import org.springframework
import org.springframework
import org.springframework

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


4. Service Registration and Discovery:

Once your microservices are configured as Eureka clients, they will automatically register themselves with the Eureka Naming Server when they start up. You can also use the @LoadBalanced annotation with your REST client to perform load-balanced service discovery. Here’s an example of using Feign, a popular declarative HTTP client in Spring Cloud:

public interface YourServiceClient {
    String yourMethod();


In this example, @FeignClient("your-service-name") instructs Feign to look up the service name in Eureka and perform load-balanced requests to that service.

5. Start Eureka Naming Server:

Before running your microservices, ensure that the Eureka Naming Server is up and running. Start the Eureka server by running a project with Eureka Server configuration, which includes the @EnableEurekaServer annotation.

With these configurations in place, your microservices will automatically register with the Eureka server when they start and will be able to discover other services by their registered names. This enables dynamic service discovery and load balancing in your microservices architecture.

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