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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：
- 由服务提供方将服务注册到 Eureka Server
- 服务消费者通过 Eureka Server 获取服务提供方的真实地址
- 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
3.测试
启动node1，node2
访问http://127.0.0.1:8761/
