Spring Cloud 的 Eureka HA

一、Eureka Server HA

     在Windows或Linux的hosts文件进行如下修改, 如两台电脑, 进行物理IP设置

127.0.0.1 peer1  127.0.0.1 peer2 

     复制上一章节的 eureka-server工程, 改名为 eureka-server-ha。

     1) 对yml文件进行如下配置:

spring:  application:      name: microservice-eureka-server-ha1  # 指定 profile=peer1  profiles: peer1server:  port: 8761                                   # 注册服务的端口号  eureka:  instance:    hostname: peer1                            # 指定当profile=peer1时，主机名    client:    service-url:      defaultZone: http://peer2:8762/eureka/   # 将自己注册到peer2这个Eureka上面去      ---spring:  application:      name: microservice-eureka-server-ha2  # 指定 profile=peer2  profiles: peer2server:  port: 8762eureka:  instance:    hostname: peer1  client:    #register-with-eureka: false   #表示是否将自己注册到Eureka Server中，默认为true, 由于当前应用就是 Eureka Server， 故而设置为false    #fetch-registry: false         #表示是否从 Eureka Server中获取注册信息, 默认为true, 因为这是一个单点的 Eureka Server, 不需要同步其它的 Eureka Server 节点的数据， 故而设置为 false    service-url:      defaultZone: http://peer1:8761/eureka/  # 设置与Eureka Server交互的地址， 查询服务和注册服务都需要依赖这个地址. 默认http://localhost:8761/eureka; 多个地址可以使用","分隔       

     2) pom.xml Maven文件配置

<?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.itmuch.cloud</groupId><artifactId>microservice-eureka-server-ha</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>eureka-server-ha</name><description>Simple for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.6.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version><spring-cloud.version>Dalston.SR3</spring-cloud.version></properties><dependencies><!-- Eureka 服务  --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-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><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

       3） 主程序 

package com.itmuch.cloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;@SpringBootApplication@EnableEurekaServer    // 开启这是一个 Eureka Server 程序public class EurekaServerApplication {public static void main(String[] args) {SpringApplication.run(EurekaServerApplication.class, args);}}

   

       4） Maven 打包

mvn clean package 

      5） 在DOS中运行

java -jar springcloud-eureka-ha-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer1  java -jar springcloud-eureka-ha-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer2  

       

二、Eureka Client 的YML文件defaultZone指向配置

        只要配置 defaultZone 的指向

server:  port: 8081  session:    timeout: 30  tomcat:    max-threads: 0    uri-encoding: UTF-8    spring:  application:    #表示注册到Eureka上的应用名称    name: cloud-service  datasource:    url: jdbc:mysql://localhost:3306/boot    username: root    password: xshdb    driver-class-name: com.mysql.jdbc.Driver      jpa:    # Specify the DBMS    database: MYSQL    # Show or not log for each sql query    show-sql: true    # Hibernate dll auto (create, create-drop, update)    hibernate:       ddl-auto: updateeureka:  client:    service-url:      #将服务注册到集群上      defaultZone: http://peer1:8761/eureka/,http://peer2:8762/eureka/  instance:    prefer-ip-address: true     # 表示将自己的IP注册到Eureka Serverk, 如果不配置该属性或将它改为false，则表示注册微服务所在操作系统的hostname到Eureka Server    

三、访问 Eureka Web 控制台