Eureka简介

Eureka

Spring Cloud Eureka 是Netflix 开发的注册发现组件，本身是一个基于 REST 的服务。提供注册与发现，同时还提供了负载均衡、故障转移等能力

Eureka3个角色

服务中心，服务提供者，服务消费者

Eureka Server：服务器端。它提供服务的注册和发现功能，即实现服务的治理。

Service Provider：服务提供者。它将自身服务注册到Eureka Server中，以便“服务消费者”能够通过服务器端提供的服务清单（注册服务列表）来调用它。

Service Consumer：服务消费者。它从 Eureka 获取“已注册的服务列表”，从而消费服务

项目架构

搭建父项目

创建Maven项目

编写pom.xml文件，添加以下内容

<packaging>pom</packaging><!-- 统一管理jar包版本 -->
<properties><maven.compiler.source>11</maven.compiler.source><maven.compiler.target>11</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><spring-cloud.version>2021.0.0</spring-cloud.version><spring-boot.version>2.6.3</spring-boot.version>
</properties><!-- 子模块继承之后，提供作用：锁定版本+子modlue不用写groupId和version  -->
<dependencyManagement><dependencies><!--spring boot 2.6.3--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>${spring-boot.version}</version><type>pom</type><scope>import</scope></dependency><!--spring cloud 2021.0.0--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud.version}</version><type>pom</type><scope>import</scope></dependency></dependencies>
</dependencyManagement>

开启Run Dashboard面板

打开项目文件夹所在目录，找到.idea/workspace.xml ，添加以下配置

 <component name="RunDashboard"><option name="ruleStates"><list><RuleState><option name="name" value="ConfigurationTypeDashboardGroupingRule" /></RuleState><RuleState><option name="name" value="StatusDashboardGroupingRule" /></RuleState></list></option><option name="configurationTypes"><set><option value="SpringBootApplicationConfigurationType" /></set></option></component>

搭建单机的Eureka

在父项目中创建maven项目模块,名字为：cloud-eureka（自定义）
编写pom.xml文件

<?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>books</artifactId><groupId>org.example</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>books-eureka</artifactId><version>1.0-SNAPSHOT</version><dependencies><!--配置中心服务端--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-server</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>2.5.6</version></plugin><plugin><groupId>com.spotify</groupId><artifactId>docker-maven-plugin</artifactId><configuration><imageName>livegoods/eurekaserver:1.0</imageName><baseImage>openjdk:11</baseImage><dockerHost>http://192.168.66.101:2375</dockerHost><entryPoint>["java", "-jar", "/${project.build.finalName}.jar"]</entryPoint><exposes><expose>8761</expose></exposes><resources><resources><targetPath>/</targetPath><directory>${project.build.directory}</directory><include>${project.build.finalName}.jar</include></resources></resources></configuration></plugin></plugins></build></project>

编写application.yml

server:port: 8761
spring:application:name: books-eureka-server
eureka:client:fetch-registry: falseregister-with-eureka: falselogging:pattern:console: '%d{MM/dd HH:mm:ss.SSS} %clr(%-5level) ---  [%-15thread] %cyan(%-50logger{50}):%msg%n'

编写主启动类

package fz;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;@SpringBootApplication
@EnableEurekaServer
public class ServiceEureka8761 {public static void main(String[] args) {SpringApplication.run(ServiceEureka8761.class, args);}
}

访问

http://localhost:8761/