concept Eureka in category spring

This is an excerpt from Manning's book Spring Microservices in Action, 2E MEAP V07. Login to get full access to this book.

Eureka. Eureka (https://github.com/Netflix/eureka) is an open source Netflix project that, like Consul, offers similar service discovery capabilities. Eureka also has a key-value database that can be used with Spring Cloud Config.

Figure 6.4 shows the implementation of the client-side caching with Eureka for our Ostock microservices.

Figure 6.4 By implementing client-side caching and Eureka with the licensing and organization services, you can lessen the load on the Eureka servers and improve client stability if Eureka becomes unavailable.

#A Logical name of the service that will be registered with Eureka

Listing 6.7 Adding the spring.application.name in the licensing service’s bootstrap.yml file

spring:
    application:
     name: licensing-service
    profiles:
      active: dev
    cloud:
        config:
            uri: http://localhost:8071

Every service registered with Eureka will have two components associated with it: the application ID and the instance ID. The application ID is used to represent a group service instance. In a Spring-Boot-based microservice, the application ID will always be the value set by the spring.application.name property. For our organization service, our spring.application.name is creatively named organization-service and licensing-service for our licensing service. The instance ID will be a random auto-generated number meant to represent a single service instance.

Next, we need to tell Spring Boot to register the organization and licensing services with Eureka. This registration is done via additional configuration in the service’s configuration files managed by the Spring Configuration Service. For purposes of this example, those files are located in the Spring Configuration server project in the path src/main/resources/config/organization-service.properties and src/main/resources/config/licensing-service.properties. The following code listing 6.8 shows how to register the service with Eureka.

Eureka is a Netflix project that, when used with Spring Cloud, is easy to set up and configure.

This is an excerpt from Manning's book Spring Microservices in Action. Login to get full access to this book.

Eureka— Eureka (https://github.com/Netflix/eureka) is an open source Net-flix project that, like Consul, offers similar service discovery capabilities. Eureka also has a key-value database that can be used with Spring Cloud Config.

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.thoughtmechanix</groupId>
  <artifactId>eurekasvr</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>
  <name>Eureka Server</name>
  <description>Eureka Server demo project</description>
<!--Not showing the maven definitions for using Spring Cloud Parent-->
  <dependencies>
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-eureka-server</artifactId>          #1
    </dependency>
  </dependencies>
Rest of pom.xml removed for conciseness
....
</project>  

Eureka is a Netflix project that when used with Spring Cloud, is easy to set up and configure.

Figure 4.4. By implementing client-side caching and Eureka with the licensing and organization services, you can lessen the load on the Eureka servers and improve client stability if Eureka becomes unavailable.