Eureka Server Jar Download: How to Integrate with Spring Boot and Spring Cloud
How to Download and Use Eureka Server JAR
If you are developing microservices with Spring Boot, you might want to use Eureka Server as a service registry and discovery tool. In this article, you will learn what Eureka Server is, how to download it from GitHub, how to run it locally, and how to register and discover services with it.
What is Eureka Server and Why You Need It
Eureka Server is an application that holds the information about all client-service applications. Every microservice will register into the Eureka server and Eureka server knows all the client applications running on each port and IP address. Eureka Server is also known as Discovery Server.
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Eureka Server is a service registry for microservices
A service registry is a central place where all the services can register themselves and provide their metadata, such as host, port, health indicator, etc. A service registry also allows clients to look up the available services and their locations. This way, clients do not need to hard-code the service URLs or rely on external configuration.
Eureka Server enables service discovery and load balancing
Service discovery is the process of finding the network location of a service provider given its logical name. With Eureka Server, each client can simultaneously act as a server to replicate its status to a connected peer. In other words, a client retrieves a list of all connected peers in a service registry, and makes all further requests to other services through a load-balancing algorithm. To be informed about the presence of a client, they have to send a heartbeat signal to the registry.
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Eureka Server is part of Spring Cloud Netflix project
Spring Cloud Netflix provides integrations for various Netflix OSS components, such as Eureka, Ribbon, Hystrix, Zuul, etc. These components help you build distributed systems with common patterns like service discovery, circuit breaker, intelligent routing, etc. Spring Cloud Netflix makes it easy to use these components with Spring Boot applications.
How to Download Eureka Server JAR from GitHub
One way to get Eureka Server JAR file is to download it from GitHub. Here are the steps:
Go to the releases page of Netflix/eureka repository
The official GitHub repository for Eureka Server is [Netflix/eureka](^1^). You can find all the releases of Eureka Server on this page . You can choose the latest or desired version of Eureka Server from the list.
Choose the latest or desired version of Eureka Server
For example, if you want to download the latest version (2.0.0) of Eureka Server, you can click on the v2.0.0 tag . You will see a page with some release notes and assets.
Download the eureka-server-x.x.x.jar file
Under the assets section, you will find a file named eureka-server-x.x.x.jar (where x.x.x is the version number). This is the executable JAR file for Eureka Server. You can download it by clicking on it or using the right-click menu and choosing "Save link as...". Save the file to your desired location on your computer.
How to Run Eureka Server JAR Locally
Once you have downloaded the Eureka Server JAR file, you can run it locally on your machine. Here are the steps:
Open a terminal and navigate to the directory where you downloaded the JAR file
For example, if you saved the file in your Downloads folder, you can open a terminal and type cd Downloads to change the current directory to Downloads.
Execute the command java -jar eureka-server-x.x.x.jar
Make sure you have Java installed on your machine. You can check the Java version by typing java -version in the terminal. If you have Java, you can run the Eureka Server JAR file by typing java -jar eureka-server-x.x.x.jar (where x.x.x is the version number). This will start the Eureka Server application on your machine.
Verify that Eureka Server is running on
By default, Eureka Server runs on port 8761. You can verify that Eureka Server is running by opening a browser and typing in the address bar. You should see a web page with the title "Eureka" and some information about the Eureka Server instance, such as status, registered applications, etc.
How to Register and Discover Services with Eureka Server
Now that you have Eureka Server running locally, you can use it to register and discover services. Here are the steps:
Add spring-cloud-starter-netflix-eureka-client dependency to your microservice project
If you are using Spring Boot to create your microservice project, you can add the spring-cloud-starter-netflix-eureka-client dependency to your pom.xml file. This will enable your microservice to communicate with Eureka Server and register itself as a client. For example, you can add this dependency:
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>
Annotate your main application class with @EnableEurekaClient
To enable Eureka Client in your microservice, you need to annotate your main application class with @EnableEurekaClient. This annotation will automatically register your microservice with Eureka Server when it starts up. For example, you can annotate your main application class like this:
@SpringBootApplication @EnableEurekaClient public class MyMicroserviceApplication public static void main(String args) SpringApplication.run(MyMicroserviceApplication.class, args);
Configure the eureka.client.serviceUrl.defaultZone property in your application.properties file
To tell your microservice where to find Eureka Server, you need to configure the eureka.client.serviceUrl.defaultZone property in your application.properties file. This property specifies the URL of Eureka Server that your microservice will use to register and discover services. For example, if you are running Eureka Server locally on port 8761, you can configure this property like this:
Start your microservice and check the Eureka dashboard for registration details
Now you can start your microservice and see it register itself with Eureka Server. You can check the Eureka dashboard on and see your microservice listed under the registered applications section. You can also click on your microservice name and see its details, such as instance ID, host, port, status, etc.
In this article, you learned how to download and use Eureka Server JAR file from GitHub. You also learned how to run Eureka Server locally and how to register and discover services with it. Eureka Server is a powerful tool for building microservices with Spring Boot and Spring Cloud Netflix. It provides service registry and discovery features that enable dynamic scaling and fault tolerance for your microservices.
What is the difference between Eureka Server and Eureka Client?
Eureka Server is an application that holds the information about all client-service applications. It acts as a service registry and discovery tool for microservices. Eureka Client is a library that enables a microservice to communicate with Eureka Server and register itself as a client. Eureka Client also provides features such as load balancing, caching, health checking, etc.
How to change the port of Eureka Server?
By default, Eureka Server runs on port 8761. If you want to change the port of Eureka Server, you can configure the server.port property in your application.properties file. For example, if you want to run Eureka Server on port 8080, you can configure this property like this: