Spring Cloud Eureka快读入门Demo

1.什么是Eureka？

Eureka 由 Netflix 开发，是一种基于REST（Representational State Transfer）的服务，用于定位服务（服务注册与发现），以实现中间层服务的负载均衡和故障转移，此服务被称为 Eureka Server。同时，它还附带了基于 Java 的客户端组件：Eureka Client，它使得客户端与 Eureka Server 的交互变得更加的容易。 以下就是一个简单的服务调用过程：

1. 由服务提供方将服务注册到 Eureka Server
2. 服务消费者通过 Eureka Server 获取服务提供方的真实地址
3. 服务消费者通过真实的地址调用服务

2.代码工程

实验目的

搭建Eureka集群

pom.xml

<?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">     <parent>         <artifactId>eureka</artifactId>         <groupId>com.et</groupId>         <version>1.0-SNAPSHOT</version>     </parent>     <modelVersion>4.0.0</modelVersion>      <artifactId>eureka-server</artifactId>      <properties>         <maven.compiler.source>8</maven.compiler.source>         <maven.compiler.target>8</maven.compiler.target>     </properties>     <dependencies>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-web</artifactId>         </dependency>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-actuator</artifactId>         </dependency>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-test</artifactId>             <scope>test</scope>         </dependency>         <dependency>             <groupId>org.projectlombok</groupId>             <artifactId>lombok</artifactId>             <optional>true</optional>         </dependency>         <dependency>             <groupId>org.springframework.cloud</groupId>             <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>             <version>${eureka.version}</version>         </dependency>     </dependencies>  </project>

EurekaServerApplication

package com.et.eureka;  import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;  @EnableEurekaServer @SpringBootApplication public class EurekaServerApplication {    public static void main(String[] args) {     SpringApplication.run(EurekaServerApplication.class, args);   } }

节点1配置信息

server:   port: 8761  eureka:   instance:     hostname: node1 # eureka name     prefer-ip-address: false   client:     fetch-registry: false     register-with-eureka: true     # eureka url     service-url:       defaultZone: http://node2:8762/eureka spring:   application:     name: "eureka-server-ha"

节点2配置信息

server:   port: 8762  eureka:   instance:     hostname: node2 # eureka name     prefer-ip-address: false   client:     fetch-registry: false     register-with-eureka: true     # eureka url     service-url:       defaultZone: http://node1:8761/eureka spring:   application:     name: "eureka-server-ha"

配置本机host

/etc/hosts

127.0.0.1 node1 127.0.0.1 node2

以上只是一些关键代码，所有代码请参见下面代码仓库

代码仓库

• GitHub - Harries/springcloud-demo: Spring Cloud tutorial about hystrix,eureka,config,admin,skywalking

3.测试

启动node1，node2

访问http://127.0.0.1:8761/

4.引用

• Spring Cloud Netflix
• Spring Cloud 3: Eureka Clustering | Nick Li
• Spring Cloud Eureka快读入门Demo | Harries Blog™