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Zein Marwan
Zein Marwan

Download Eureka Server: Best Practices and Tips for Using It


How to Download Eureka Server




If you are developing microservices applications, you might have heard of Eureka server. Eureka server is a service discovery tool that helps you manage and locate your microservices. In this article, you will learn what Eureka server is, why it is useful for microservices, and how to download and run it using Spring Boot and Maven or Gradle.


What are Microservices?




Microservices are an architectural style that develops a single application as a set of small, independent, and loosely coupled services. Each service performs a specific function and communicates with other services through well-defined APIs. Microservices offer several advantages over monolithic architectures, such as:




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  • Agility: Microservices enable faster development and deployment cycles, as each service can be updated independently without affecting the whole application.



  • Scalability: Microservices allow each service to be scaled separately according to the demand for its functionality, reducing the cost and waste of over-provisioning resources.



  • Resilience: Microservices improve the availability and reliability of the application, as a failure in one service does not affect the other services.



  • Diversity: Microservices allow each service to use different technologies and languages, depending on the best fit for its purpose.



What is Eureka Server?




Eureka server is a service discovery tool that helps you manage and locate your microservices. Service discovery is a process of finding the network location of a service provider by a service consumer. Service discovery is essential for microservices architectures, as there can be many services running on different hosts and ports, and they can change dynamically due to scaling or failures.


Eureka server provides the following features for service discovery:


  • Registration: Each microservice registers itself with the Eureka server by providing its metadata, such as host, port, health endpoint, etc. The microservice also sends periodic heartbeats to the Eureka server to renew its registration and inform its availability.



  • Discovery: The Eureka server maintains a registry of all the registered microservices and their metadata. The microservice consumers can query the Eureka server for the available instances of a microservice provider and get the information needed to invoke it.



  • Load balancing: The Eureka server can also act as a load balancer by distributing the requests from the microservice consumers to the available instances of a microservice provider in a round-robin fashion.



Prerequisites for Downloading Eureka Server




To download and run Eureka server, you need the following prerequisites:


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  • Java 1.8 or later



  • Spring Boot 2.6.0 or later



  • Maven 3.5+ or Gradle 7.5+



Steps to Download Eureka Server




The easiest way to download Eureka server is to use Spring Initializr, which is a web tool that helps you generate a Spring Boot project with the dependencies you need. Follow these steps to download Eureka server using Spring Initializr:


  • Go to [16]( and fill in your project details, such as group name, artifact name , and package name. You can also choose the project type (Maven or Gradle) and the language (Java, Kotlin, or Groovy).



  • Select Spring Boot version 2.6.0 or later from the dropdown menu.



  • Add the Eureka Server dependency by clicking on the Add dependencies button and searching for Eureka Server. You can also add other dependencies you need for your project, such as Spring Web or Spring Cloud Config.



  • Click on the Generate button to download the zip file containing your project.



  • Extract the zip file and open the project in your preferred IDE or editor.



Alternatively, you can also download Eureka server using Maven or Gradle directly. For Maven, you need to add the following dependency to your pom.xml file:


```xml


org.springframework.cloud


spring-cloud-starter-netflix-eureka-server


``` For Gradle, you need to add the following dependency to your build.gradle file:


```groovy dependencies implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-server' ``` After downloading Eureka server, you need to do some configuration to run it. First, you need to enable the Eureka server by adding the @EnableEurekaServer annotation to your main application class, as shown below:


```java import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; @SpringBootApplication @EnableEurekaServer public class EurekaServerApplication public static void main(String[] args) SpringApplication.run(EurekaServerApplication.class, args); ``` Next, you need to specify some properties for your Eureka server in the application.properties or application.yml file, such as the port number, the hostname, and whether to register itself as a client. Here is an example of application.properties file for Eureka server:


```properties server.port=8761 eureka.client.register-with-eureka=false eureka.client.fetch-registry=false eureka.instance.hostname=localhost ``` The above properties mean that the Eureka server will run on port 8761, will not register itself as a client, will not fetch other services from the registry, and will use localhost as its hostname. You can change these properties according to your needs.


How to Test Eureka Server




To test if your Eureka server is working properly, you can run it using your IDE or by executing the following command in your terminal:


```bash mvn spring-boot:run # for Maven gradle bootRun # for Gradle ``` Once your Eureka server is running, you can access its dashboard by opening [17]( in your browser. You should see something like this:



The dashboard shows some information about your Eureka server, such as its status, its general info, and its registered instances. You can also see some links to access other features of Eureka server, such as metrics, environment, and health.


To test if your Eureka server can register other microservices, you need to create a client service that uses Eureka client dependency and registers itself with the Eureka server. You can follow a similar process as downloading Eureka server, but this time you need to add the Eureka Client dependency instead of the Eureka Server dependency. You also need to add the @EnableDiscoveryClient annotation to your main application class and specify some properties for your client service in the application.properties or application.yml file, such as the name of the service and the URL of the Eureka server. Here is an example of a client service that registers itself with the Eureka server:


```java import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; @SpringBootApplication @EnableDiscoveryClient public class ClientServiceApplication public static void main(String[] args) SpringApplication.run(ClientServiceApplication.class, args); ``` ```properties spring.application.name=client-service server.port=8080 eureka.client.service-url.defaultZone=


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