二、SpringCloud之Eureka服务注册与发现

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_29479041/article/details/83651655

一、Eureka简介

1、基于Netflix Eureka做了二次封装

2、两个组件组成：

• Eureka Server 注册中心
• Eureka Client 服务注册

3、Eureka总结：

• @EnableEurekaServer   @EnableEurekaClient
• 心跳检测、健康检查、负载均衡等功能
• Eureka的高可用，生产上建议至少两台以上

二、Eureka Server 注册中心

1、步骤

• pom.xml

    <properties>
        <spring-cloud.version>Greenwich.M1</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <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>

• application.yml

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
    fetch-registry: false
  server:
    enable-self-preservation: false #关闭自我保护模式 开发环境关闭，生产环境不要这样设置
spring:
  application:
    name: eureka
server:
  port: 8761

• EurekaApplication

@EnableEurekaServer  //启用注册中心的功能
@SpringBootApplication
public class EurekaApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaApplication.class, args);
    }
}

2、测试（http://localhost:8761/）

3、后台启动（这样就不用每次都去启动它）

• 1.将euraka打成jar包 ，将jar包放进一个文件夹内 

• 2.在终端写启动命令

Amy:~ Amy$ nohup java -jar /Users/Amy/Downloads/service/eureka-0.0.1-SNAPSHOT.jar > /dev/null 2>&1 &
[1] 5628
Amy:~ Amy$ ps -ef |grep eureka    3.http://localhost:8761/

#如果要停止进程
Amy:~ Amy$ kill -9 5628

三、Eureka Client 服务注册

1、步骤

• pom.xml(版本要与Eureka Server保持一致)

    <properties>
        <spring-cloud.version>Greenwich.M1</spring-cloud.version>
    </properties>    
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <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>

• application.yml

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
  instance:
    hostname: clientName #自定义连接
spring:
  application:
    name: client

• ClientApplication

@EnableDiscoveryClient //开启发现服务功能
@SpringBootApplication
public class ClientApplication {
    public static void main(String[] args) {
        SpringApplication.run(ClientApplication.class, args);
    }
}

2、测试