创建eureka集群

springcloud-eureka-7002

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配置pom.xml文件

  1. <?xml version="1.0"?>
  2. <project
  3.     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"
  4.     xmlns="http://maven.apache.org/POM/4.0.0"
  5.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  6.     <modelVersion>4.0.0</modelVersion>
  7.     <parent>
  8.         <groupId>com.junjay</groupId>
  9.         <artifactId>SpringCloud</artifactId>
  10.         <version>0.0.1-SNAPSHOT</version>
  11.     </parent>
  12.     <groupId>com.junjay</groupId>
  13.     <artifactId>springcloud-eureka-7002</artifactId>
  14.     <version>0.0.1-SNAPSHOT</version>
  15.     <name>springcloud-eureka-7002</name>
  16.     <url>http://maven.apache.org</url>
  17.     <properties>
  18.         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  19.     </properties>
  20.     <dependencies>
  22.         <dependency>
  23.             <groupId>junit</groupId>
  24.             <artifactId>junit</artifactId>
  25.             <version>3.8.1</version>
  26.             <scope>test</scope>
  27.         </dependency>
  29.         <!-- 导包eureka -->
  30.         <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->
  31.         <dependency>
  32.             <groupId>org.springframework.cloud</groupId>
  33.             <artifactId>spring-cloud-starter-eureka-server</artifactId>
  34.             <version>1.4.6.RELEASE</version>
  35.         </dependency>
  37.         <!-- 热部署工具 -->
  38.         <dependency>
  39.             <groupId>org.springframework.boot</groupId>
  40.             <artifactId>spring-boot-devtools</artifactId>
  41.         </dependency>
  43.         <dependency>
  44.             <groupId>org.mybatis.spring.boot</groupId>
  45.             <artifactId>mybatis-spring-boot-starter</artifactId>
  46.         </dependency>
  48.         <dependency>
  49.             <groupId>org.springframework.boot</groupId>
  50.             <artifactId>spring-boot-starter-web</artifactId>
  51.         </dependency>
  53.     </dependencies>
  54. </project>

添加yml配置文件

  1. server:
  2.   port: 7002
  3. #Eureka 配置
  4. eureka:
  5.   instance:
  6.     hostname: localhost #首先声明eureka服务端名字
  7.   client:
  8.     register-with-eureka: false #是否向eureka中心注册自己
  9.     fetch-registry: false #如果fetch-registry为false，则表示自己是注册中心
  10.     service-url: #监控页面
  11.       #使用${}动态获取yml配置文件中值
  12.       #defaultZone 默认http://localhost:8761/eureka
  13.       defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

添加springboot启动类

  1. package com.junjay.eureka;
  3. import org.springframework.boot.SpringApplication;
  4. import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
  5. import org.springframework.boot.autoconfigure.SpringBootApplication;
  6. import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
  7. import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
  9. @SpringBootApplication
  10. //开启启动eureka，注解肯定是enable+eureka。。。
  11. @EnableEurekaServer // @EnableEurekaServer服务的启动类，可以接收别人注册进来
  13. //在Spring
  14. // boot的启动引导类上增加@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})，阻止Spring
  15. // boot自动注入dataSource
  16. @EnableAutoConfiguration(exclude = { DataSourceAutoConfiguration.class })
  17. public class EurekaService_7002 {
  19.     public static void main(String[] args) {
  21.         SpringApplication.run(EurekaService_7002.class, args);
  23.     }
  24. }

springcloud-eureka-7003

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配置pom.xml文件

  1. <?xml version="1.0"?>
  2. <project
  3.     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"
  4.     xmlns="http://maven.apache.org/POM/4.0.0"
  5.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  6.     <modelVersion>4.0.0</modelVersion>
  7.     <parent>
  8.         <groupId>com.junjay</groupId>
  9.         <artifactId>SpringCloud</artifactId>
  10.         <version>0.0.1-SNAPSHOT</version>
  11.     </parent>
  12.     <groupId>com.junjay</groupId>
  13.     <artifactId>springcloud-eureka-7002</artifactId>
  14.     <version>0.0.1-SNAPSHOT</version>
  15.     <name>springcloud-eureka-7002</name>
  16.     <url>http://maven.apache.org</url>
  17.     <properties>
  18.         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  19.     </properties>
  20.     <dependencies>
  22.         <dependency>
  23.             <groupId>junit</groupId>
  24.             <artifactId>junit</artifactId>
  25.             <version>3.8.1</version>
  26.             <scope>test</scope>
  27.         </dependency>
  29.         <!-- 导包eureka -->
  30.         <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->
  31.         <dependency>
  32.             <groupId>org.springframework.cloud</groupId>
  33.             <artifactId>spring-cloud-starter-eureka-server</artifactId>
  34.             <version>1.4.6.RELEASE</version>
  35.         </dependency>
  37.         <!-- 热部署工具 -->
  38.         <dependency>
  39.             <groupId>org.springframework.boot</groupId>
  40.             <artifactId>spring-boot-devtools</artifactId>
  41.         </dependency>
  43.         <dependency>
  44.             <groupId>org.mybatis.spring.boot</groupId>
  45.             <artifactId>mybatis-spring-boot-starter</artifactId>
  46.         </dependency>
  48.         <dependency>
  49.             <groupId>org.springframework.boot</groupId>
  50.             <artifactId>spring-boot-starter-web</artifactId>
  51.         </dependency>
  53.     </dependencies>
  54. </project>

添加yml配置文件

  1. server:
  2.   port: 7003
  3. #Eureka 配置
  4. eureka:
  5.   instance:
  6.     hostname: localhost #首先声明eureka服务端名字
  7.   client:
  8.     register-with-eureka: false #是否向eureka中心注册自己
  9.     fetch-registry: false #如果fetch-registry为false，则表示自己是注册中心
  10.     service-url: #监控页面
  11.       #使用${}动态获取yml配置文件中值
  12.       #defaultZone 默认http://localhost:8761/eureka
  13.       defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

添加springboot启动类

  1. package com.junjay.eureka;
  3. import org.springframework.boot.SpringApplication;
  4. import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
  5. import org.springframework.boot.autoconfigure.SpringBootApplication;
  6. import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
  7. import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
  9. @SpringBootApplication
  10. //开启启动eureka，注解肯定是enable+eureka。。。
  11. @EnableEurekaServer // @EnableEurekaServer服务的启动类，可以接收别人注册进来
  13. //在Spring
  14. // boot的启动引导类上增加@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})，阻止Spring
  15. // boot自动注入dataSource
  16. @EnableAutoConfiguration(exclude = { DataSourceAutoConfiguration.class })
  17. public class EurekaService_7003 {
  19.     public static void main(String[] args) {
  21.         SpringApplication.run(EurekaService_7003.class, args);
  23.     }
  24. }

eureka集群服务

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7：Eureka集群环境配置 - 图4

eureka单机服务

  1. # 单机：defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
  2. # 集群联机：defaultZone: 单机defaultZone地址1, 单机defaultZone地址2
  3. defaultZone: http://${eureka.instance.hostname}:7001/eureka/, http://${eureka.instance.hostname}:7002/eureka/

eureka集群联机

eureka服务：springcloud-eureka-7001

  1. defaultZone: http://${eureka.instance.hostname}:7002/eureka/,http://${eureka.instance.hostname}:7003/eureka/

eureka服务：springcloud-eureka-7002

  1. defaultZone: http://${eureka.instance.hostname}:7001/eureka/,http://${eureka.instance.hostname}:7003/eureka/

eureka服务：springcloud-eureka-7003

  1. defaultZone: http://${eureka.instance.hostname}:7002/eureka/,http://${eureka.instance.hostname}:7001/eureka/

不配服务本身，是因为本身服务配置在其他服务中了

服务提供者发布集群

  1. #eureka 的配置
  2. eureka:
  3.   client:
  4.     service-url:
  5.       # 服务注册到哪里 打开eureka服务配置以配置中的地址为准 
  6.       # eureka配置好之后，开启eureka功能注解
  7.       defaultZone: http://localhost:7001/eureka,http://localhost:7002/eureka,http://localhost:7003/eureka

启动发现并没有集群
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单机的时候 eureka注册中心实例名称 是localhost，现在是集群，不能三个实例都是localhost，这里复杂的办法是搞三个虚拟机，麻烦，这里有简单办法，直接配置本机hosts，来实现本机域名映射；
找到 C:\Windows\System32\drivers\etc 打开hosts，加配置
127.0.0.1 eureka7001.com
127.0.0.1 eureka7002.com
127.0.0.1 eureka7003.com
修改配置后再启动服务，集群搭建完毕
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启动服务提供者，使其注册在集群中
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比如当其中一个eureka无法挂了，服务注册不影响可以切换其他端口上的eureka服务