How to Configure Eureka Server in Spring Boot
If you are working in a microservices environment, then it is very likely that you will be using some form of service discovery. Service discovery is a technique for automatically detecting and monitoring services in a distributed system. One popular service discovery tool is Eureka, which is developed by Netflix.
In this blog post, we will see how to configure a Eureka server in Spring Boot.
19 Starting a Eureka server – Spring Boot Microservices Level 1
- First, create a Spring Boot application with the Web and Eureka Server dependencies
- Then, add the @EnableEurekaServer annotation to your main class
- Next, configure your application’s properties file to include the eureka server URL and port number
- Finally, run your application and verify that it registers with the Eureka server successfully
Eureka Server Dependency Maven
Eureka Server Dependency Maven
The Eureka Server is a core component of the Netflix OSS stack. It is a service registry that allows clients to discover and communicate with each other.
The Eureka Server dependencies are available from Maven Central.
Spring-Cloud-Starter-Netflix-Eureka-Server
If you’re looking to get started with a Spring-Cloud-based Netflix Eureka server, then the Spring-Cloud-Starter-Netflix-Eureka-Server is a great place to start. This starter provides all of the necessary dependencies and configuration files needed to get a basic Eureka server up and running. Once you have your Eureka server up and running, you can then register your various microservices with it so that they can be discovered by other services.
The use of a Netflix Eureka server makes it easy to build a microservice architecture that is scalable and fault tolerant. Each service can be registered with multiple instances of the Eureka server, and if one instance goes down, the others will still be available to serve requests. This means that your system as a whole is much more resilient to failure.
Eureka Server Configuration
Assuming you would like a blog post discussing the configuration of Eureka Server:
Eureka Server is an integral part of the Netflix OSS ecosystem and helps maintain continuity between services. It is a REST-based service that is responsible for managing and maintaining information about registered services in the system.
In order to use Eureka, each client must register with the server and provide meta-data about themselves. The server uses this information to determine which instances are available to route requests to.
When configuring Eureka Server, there are a few key things to keep in mind.
First, you will need to specify the environment in which your server will be running – this can be done by setting the ‘eureka.environment’ property. Next, you will need to configure how often clients should heartbeat with the server – this is done via the ‘eurekaclient.instanceInfoReplicationIntervalSeconds’ property. Finally, you will need to set the location of your eureka registry file – this is done via the ‘eureka.registryFile’ property.
Once you have configured these properties, you can start up your Eureka Server and begin registering clients!
Eureka Server Spring Boot
If you’re looking for a way to get started with Spring Boot and Eureka Server, this is the blog post for you! We’ll cover everything you need to know about setting up a Eureka Server with Spring Boot, including what dependencies to include and how to configure your application.
Eureka Client Example
Eureka Client is a lightweight Java-based library used for service registration and discovery. The client registers with Eureka Server and fetches registry information from the server to find a service to invoke. It also periodically sends heartbeats to the server to re-establish liveness of the services.
In this blog post, we will go through setting up a Eureka Client example using Spring Boot. We will create two microservices, one acting as Eureka Server and another as Eureka Client. The client will register itself with the server and then fetch the registered services from the server to invoke them.
We will use Netflix OSS’s open source Eureka Server implementation for our example. You can find more information about it here: https://github.com/Netflix/eureka .
Let’s get started!
Credit: www.youtube.com
How Does Spring Boot Integrate With Eureka Server?
Spring boot provides a number of features to help us work with the Eureka server. One feature is auto-discovery. This allows our application to automatically register itself with the Eureka server, and also to discover other services that are registered with the server.
Another feature is service registration. This allows us to explicitly register our application with the Eureka server, providing information such as the hostname and port number where it can be reached.
We can also configure our application to act as a client for the Eureka server.
This enables our application to fetch information about other services that are registered with the server, such as their hostnames and port numbers. This is useful when we need to communicate with other services in our system.
How Do I Register My Eureka Server in Spring Boot?
Assuming you have a Spring Boot application with the Eureka server dependency included, you can register your application as a Eureka client by adding the @EnableEurekaClient annotation to your main class.
For example:
@SpringBootApplication
@EnableEurekaClient
public class MyApplication {
public static void main(String[] args) {
SpringApplication.run(MyApplication.class, args);
}
How Do You Set Up a Eureka Server?
Assuming you would like a blog post discussing how to set up an Eureka server:
A Eureka Server is a service that holds the information about all client-service applications. It acts as a central registry for services, and it provides both registration and discovery features.
When a service registers with Eureka, it provides meta-data such as host and port, health indicator URL, etc. about itself. Once registered, other services can discover it using the name of the service.
Eureka comes with two components – Eureka Server and Eureka Client.
The client is embedded in every microservice application that wants to register with the server; there is no need to install anything separately. The client needs the configuration details of the server to which it has to connect for registration (namely, the URL). This is generally provided in bootstrap.yml or application.properties file located in the resources folder of your project structure
The following steps are required to set up a Eureka Server:
1) Add dependency of spring-cloud-starter-netflix-eureka-server in pom.xml file
2) In application properties/yaml file, add eureka related configurations like below
eurekaserver:
instanceId: ${vcap.application.instance_id:${spring.application.name}:${random}}
How Do I Connect Microservices to Eureka Server?
Assuming you have a basic understanding of microservices and Eureka, let’s get started.
To connect your microservices to an Eureka server, you’ll first need to add the Netflix Eureka Client dependency to your project. You can find the latest version here: https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-eureka-client
With that in place, you’ll need to configure your application for Eureka discovery. This is done by simply adding the @EnableDiscoveryClient or @EnableEurekaClient annotation to your main class:
@SpringBootApplication
@EnableDiscoveryClient
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args); } }
Once that’s in place, you’ll need to point your application to the location of your Eureka server via spring cloud configuration properties in either your application.properties or application.yml file: eureka . client .
serviceUrl . defaultZone : http : //localhost : 8761 / eurake / # REPLACE WITH YOUR OWN URL OF COURSE !
The final step is simply creating a new instance of DiscoveryClient and calling its registerService method whenever a new microservice comes online: private final DiscoveryClient discoveryClient ; @Autowired public MyService ( DiscoveryClient discoveryClient ) { this .
discoveryClient = discoveryClien ;} @PostConstruct public void registerWithEureka () { String serviceId = UUID . randomUUID ().toString (); ServiceInstanceBuilder builder = ServiceInstance .
builder () .serviceName ( “my – service ” + serviceId ) // could be used by load balancer for instance // selection if multiple instances are registered with same name .instanceId ( serviceId ); ServiceInstance instance = builder .build (); discoveryClien ttregisterService (instance); }}
That’s it!
Conclusion
In this post, we will learn how to configure Eureka Server in a Spring Boot application. We will also create a simple client that will connect to the Eureka server and register itself.