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Download and Install Eureka Server Jar for Java 11 and Jakarta EE 9


How to Download Eureka Server Jar and Why You Need It




If you are developing microservices-based applications, you might have heard of Eureka Server. Eureka Server is a service discovery platform that helps you manage and coordinate your microservices in a distributed system. In this article, you will learn what Eureka Server is, what are its benefits, how to download Eureka Server jar from GitHub, how to run it as a Spring Boot application, and how to register and discover microservices with it.




download eureka server jar



What is Eureka Server and What are Its Benefits




Eureka Server is an application that holds the information about all client-service applications in your system. 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.


Eureka Server is a Service Discovery Platform for Microservices




Service discovery is a key component of microservices architecture. Service discovery allows microservices to find and communicate with each other without hard-coding their locations. This makes the system more flexible and resilient to changes.


Eureka Server provides service discovery for microservices. It allows microservices to register themselves at runtime as they appear in the system, and to discover other registered services using a simple REST API. Eureka Server also handles the health checking of the registered services and removes them from the registry if they become unavailable.


Eureka Server Enables Dynamic Scaling, Load Balancing, and Fault Tolerance




One of the advantages of microservices architecture is that it allows for dynamic scaling of the application based on the demand. However, scaling also introduces challenges such as load balancing and fault tolerance. How do you distribute the load among multiple instances of a service? How do you handle failures of some instances without affecting the whole system?


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Eureka Server helps you solve these challenges by providing load balancing and fault tolerance features. Eureka Server uses a client-side load balancer called Ribbon that can automatically distribute the requests among multiple service instances based on various criteria such as availability, response time, etc. Eureka Server also uses a circuit breaker called Hystrix that can detect failures of service instances and redirect the requests to fallback methods or other available instances.


How to Download Eureka Server Jar and Run It as a Spring Boot Application




Eureka Server is an open source project developed by Netflix and hosted on GitHub. You can download the latest release of Eureka Server jar from GitHub and run it as a Spring Boot application on your local machine or on any cloud platform that supports Java.


Prerequisites for Downloading Eureka Server Jar




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


  • A Java Development Kit (JDK) version 11 or higher. You can download JDK from [Oracle](^7^) or use any other distribution such as [OpenJDK](^8^).



  • A Git client to clone the Eureka repository from GitHub. You can download Git from [here](^9^).



  • A command-line tool such as Terminal on Mac or Linux, or Command Prompt or PowerShell on Windows.



Steps for Downloading Eureka Server Jar from GitHub




To download Eureka Server jar from GitHub, follow these steps:


Open your command-line tool and navigate to a directory where you want to clone the Eureka repository. For example, on Mac or Linux, you can use the following command: cd /Documents


Clone the Eureka repository from GitHub using the following command: git clone https://github.com/Netflix/eureka.git


  • This will create a directory called eureka in your current directory.



Navigate to the eureka-server subdirectory inside the eureka directory using the following command: cd eureka/eureka-server


  • This is where the Eureka Server jar file is located.



List the contents of the eureka-server directory using the following command: ls


  • You should see a file called eureka-server-1.10.16-SNAPSHOT.jar. This is the Eureka Server jar file that you need to run.



Steps for Running Eureka Server Jar as a Spring Boot Application




To run Eureka Server jar as a Spring Boot application, follow these steps:


Make sure you have JDK 11 or higher installed and set as your default Java version. You can check your Java version using the following command: java -version


You should see something like this: java version "11.0.12" 2021-07-20 LTS Java(TM) SE Runtime Environment 18.9 (build 11.0.12+8-LTS-237) Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.12+8-LTS-237, mixed mode)


  • If you see a different version or an error message, you need to install or update your JDK.



Run the Eureka Server jar file using the following command: java -jar eureka-server-1.10.16-SNAPSHOT.jar


This will start the Eureka Server application on port 8761 by default. You should see something like this: ... 2023-06-21 04:15:23.456 INFO 1234 --- [ main] c.n.e.EurekaBootStrap : Started Eureka Server 2023-06-21 04:15:23.459 INFO 1234 --- [ main] c.n.e.EurekaBootStrap : Setting up periodic instance registry sync task 2023-06-21 04:15:23.460 INFO 1234 --- [ main] c.n.e.EurekaBootStrap : Eureka data center value eureka.datacenter is not set, defaulting to default 2023-06-21 04:15:23.460 INFO 1234 --- [ main] c.n.e.EurekaBootStrap : Eureka environment value eureka.environment is not set, defaulting to test 2023-06-21 04:15:23.461 INFO 1234 --- [ main] c.n.e.EurekaBootStrap : isAws returned false 2023-06-21 04:15:23.462 INFO 1234 --- [ main] c.n.e.EurekaBootStrap : Initialized server context 2023-06-21 04:15:23.462 INFO 1234 --- [ main] c.n.e.r.PeerAwareInstanceRegistryImpl : Got 1 instances from neighboring DS node 2023-06-21 04:15:23.462 INFO 1234 --- [ main] c.n.e.r.PeerAwareInstanceRegistryImpl : Renew threshold is: 1 2023-06-21 04:15:23.462 INFO 1234 --- [ main] c.n.e.r.PeerAwareInstanceRegistryImpl : Changing status to UP 2023-06-21 04:15:23.464 INFO 1234 --- [ main] e.s.EurekaServerInitializerConfiguration : Started Eureka Server ...


  • This means that the Eureka Server is up and running.



  • Open your web browser and go to http://localhost:8761/. You should see the Eureka Dashboard, which shows the status of the Eureka Server and the registered services.



How to Register and Discover Microservices with Eureka Server




Now that you have downloaded and run the Eureka Server jar, you can use it to register and discover microservices in your system. To do this, you need to add Eureka Client dependency to your microservice project, configure your microservice to register with Eureka Server, and use Eureka Dashboard to view registered microservices.


How to Add Eureka Client Dependency to Your Microservice Project




To register your microservice with Eureka Server, you need to add Eureka Client dependency to your microservice project. Eureka Client is a library that provides the functionality of registering and discovering services with Eureka Server. You can use any Java framework or tool to create your microservice project, such as Spring Boot, Maven, Gradle, etc.


For example, if you are using Spring Boot and Maven, you can add the following dependency to your pom.xml file:


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


If you are using Spring Boot and Gradle, you can add the following dependency to your build.gradle file:


dependencies implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-client'


After adding the dependency, you need to update your project using your IDE or command-line tool.


How to Configure Your Microservice to Register with Eureka Server




After adding the Eureka Client dependency, you need to configure your microservice to register with Eureka Server. You can do this by adding some properties to your application.properties or application.yml file in your microservice project. These properties include:


eureka.client.service-url.defaultZone: This property specifies the URL of the Eureka Server that your microservice will register with. For example, if your Eureka Server is running on localhost:8761, you can set this property as follows: eureka.client.service-url.defaultZone=http://localhost:8761/eureka





eureka.instance.appname: This property specifies the name of your microservice that will be registered with Eureka Server. You can choose any name that is unique and descriptive for your microservice. For example, if your microservice is a product service, you can set this property as follows: eureka.instance.appname=product-service





eureka.instance.instance-id: This property specifies the ID of your microservice instance that will be registered with Eureka Server. You can use any ID that is unique and identifiable for your microservice instance. For example, if your microservice is a product service and you have multiple instances running on different ports, you can set this property as follows: eureka.instance.instance-id=$spring.application.name:$server.port


  • This will use the appname and port as the instance ID.



Here is an example of a complete application.properties file for a product service that registers with Eureka Server:


spring.application.name=product-service server.port=8080 eureka.client.service-url.defaultZone=http://localhost:8761/eureka eureka.instance.appname=$spring.application.name eureka.instance.instance-id=$spring.application.name:$server.port


How to Use Eureka Dashboard to View Registered Microservices




Once you have configured your microservice to register with Eureka Server, you can use the Eureka Dashboard to view the registered microservices and their details. To access the Eureka Dashboard, open your web browser and go to http://localhost:8761/. You should see something like this:



The Eureka Dashboard shows the following information:


  • The status of the Eureka Server itself, such as UP or DOWN.



  • The number of replicas of the Eureka Server in the system.



  • The number of registered applications and instances in the system.



  • The list of registered applications and their instances, along with their status, IP address, port, health check URL, etc.



You can click on any application or instance name to see more details about it. You can also refresh the dashboard manually or automatically using the buttons on the top right corner.


Conclusion and FAQs




Conclusion




In this article, you learned how to download Eureka Server jar from GitHub and run it as a Spring Boot application. You also learned how to register and discover microservices with Eureka Server using Eureka Client dependency and configuration properties. You also learned how to use Eureka Dashboard to view the registered microservices and their details.


Eureka Server is a powerful and easy-to-use service discovery platform for microservices that enables dynamic scaling, load balancing, and fault tolerance. It is widely used by many companies and projects, such as Netflix, Amazon, and Spring Cloud. If you want to learn more about Eureka Server and how to use it in your microservices architecture, you can check out the following resources:


  • [Eureka Server GitHub Repository]: This is the official GitHub repository of Eureka Server, where you can find the source code, documentation, issues, and releases of Eureka Server.



  • [Eureka Server Documentation]: This is the official documentation of Eureka Server, where you can find the overview, concepts, features, configuration, and examples of Eureka Server.



  • [Spring Cloud Netflix Eureka]: This is the official website of Spring Cloud Netflix Eureka, where you can find the guides, tutorials, and references of how to use Eureka Server with Spring Boot and Spring Cloud.



FAQs




Here are some frequently asked questions about Eureka Server and their answers:


Question


Answer


What is the difference between Eureka Server and Eureka Client?


Eureka Server is the application that holds the information about all the registered microservices in the system. Eureka Client is the library that provides the functionality of registering and discovering microservices with Eureka Server. You need to run one or more instances of Eureka Server in your system, and add Eureka Client dependency to your microservice projects.


How do I 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 add the following property to your application.properties or application.yml file in your Eureka Server project: server.port=your-port-number


For example, if you want to run Eureka Server on port 8080, you can add the following property: server.port=8080


You also need to update the eureka.client.service-url.defaultZone property in your microservice projects to point to the new port of Eureka Server.


How do I run multiple instances of Eureka Server?


If you want to run multiple instances of Eureka Server for high availability and redundancy, you can use the peer-aware mode of Eureka Server. In this mode, each instance of Eureka Server will register itself with other instances as a peer, and replicate the registry information among them. To enable this mode, you need to add the following properties to your application.properties or application.yml file in your Eureka Server project: eureka.client.register-with-eureka=true eureka.client.fetch-registry=true eureka.client.service-url.defaultZone=http://peer1:port1/eureka/,http://peer2:port2/eureka/,...


The first two properties tell Eureka Server to register itself with other instances and fetch their registry information. The third property specifies the URLs of other instances as peers. You need to replace peer1, port1, peer2, port2, etc. with the actual hostnames and ports of your instances. You also need to update the eureka.client.service-url.defaultZone property in your microservice projects to include all the URLs of your instances.


How do I secure Eureka Server?


If you want to secure Eureka Server from unauthorized access or modification, you can use Spring Security to add authentication and authorization features to your Eureka Server project. You can follow this [guide] to learn how to secure Eureka Server with Spring Security.


How do I monitor Eureka Server?


If you want to monitor the performance and health of Eureka Server and its registered services, you can use Spring Boot Actuator to expose various metrics and endpoints for your Eureka Server project. You can follow this [guide] to learn how to monitor Eureka Server with Spring Boot Actuator.




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