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Eureka实战-2【构建Multi Zone Eureka Server】

  • 2019 年 10 月 3 日
  • 筆記

工程pom中公共依赖

<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>Finchley.RELEASE</spring-cloud.version>  </properties>    <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>

 

1、Eureka Server工程

启动4个实例，配置两个zone，即zone1、zone2，每个zone都要2个eureka server实例，这个2个zone配置在同一个region上，即region-east。

1.1、eureka-server工程pom文件：

<!--加上文章头部的公共依赖-->

<dependencies>          <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>              </plugin>        </plugins>  </build>

 

1.2、eureka-server工程启动类

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

 

1.3、eureka-server工程配置文件，路径：eureka-serversrcmainresources，分别有5个文件：application-zone1a.yml，application-zone1b.yml，application-zone2a.yml，application-zone2b.yml，application.yml

application-zone1a.yml：

server:    port: 8761  spring:    application:      name: eureka-server  eureka:    instance:      hostname: localhost      preferIpAddress: true      metadataMap.zone: zone1    client:      register-with-eureka: true      fetch-registry: true      region: region-east      service-url:        zone1: http://localhost:8761/eureka/,http://localhost:8762/eureka/        zone2: http://localhost:8763/eureka/,http://localhost:8764/eureka/      availability-zones:        region-east: zone1,zone2    server:        waitTimeInMsWhenSyncEmpty: 0        enableSelfPreservation: false

application-zone1b.yml

server:    port: 8762  spring:    application:      name: eureka-server  eureka:    instance:      hostname: localhost      preferIpAddress: true      metadataMap.zone: zone1    client:      register-with-eureka: true      fetch-registry: true      region: region-east      service-url:        zone1: http://localhost:8761/eureka/,http://localhost:8762/eureka/        zone2: http://localhost:8763/eureka/,http://localhost:8764/eureka/      availability-zones:        region-east: zone1,zone2    server:        waitTimeInMsWhenSyncEmpty: 0        enableSelfPreservation: false

application-zone2a.yml

server:    port: 8763  spring:    application:      name: eureka-server  eureka:    instance:      hostname: localhost      preferIpAddress: true      metadataMap.zone: zone2    client:      register-with-eureka: true      fetch-registry: true      region: region-east      service-url:        zone1: http://localhost:8761/eureka/,http://localhost:8762/eureka/        zone2: http://localhost:8763/eureka/,http://localhost:8764/eureka/      availability-zones:        region-east: zone1,zone2    server:        waitTimeInMsWhenSyncEmpty: 0        enableSelfPreservation: false

application-zone2b.yml

server:    port: 8764  spring:    application:      name: eureka-server  eureka:    instance:      hostname: localhost      preferIpAddress: true      metadataMap.zone: zone2    client:      register-with-eureka: true      fetch-registry: true      region: region-east      service-url:        zone1: http://localhost:8761/eureka/,http://localhost:8762/eureka/        zone2: http://localhost:8763/eureka/,http://localhost:8764/eureka/      availability-zones:        region-east: zone1,zone2    server:        waitTimeInMsWhenSyncEmpty: 0        enableSelfPreservation: false

application.yml

eureka:    server:      use-read-only-response-cache: false      response-cache-auto-expiration-in-seconds: 10  management:    endpoints:      web:        exposure:          include: '*'

 

从上面的4个配置文件可以看出，我们通过eureka.instance.metadataMap.zone设置了每个实例所属的zone，接下来使用这4个配置启动4个eureka server实例：

//启动命令
mvn spring-boot:run -Dspring.profiles.active=zone1a  mvn spring-boot:run -Dspring.profiles.active=zone1b  mvn spring-boot:run -Dspring.profiles.active=zone2a  mvn spring-boot:run -Dspring.profiles.active=zone2b

 

2、Eureka Client工程

这里配置2个eureka clent，分别属于zone1和zone2。

2.1、eureka-client工程pom文件

<!--加上文章头部公共配置-->

<dependencies>          <dependency>              <groupId>org.springframework.cloud</groupId>              <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>          </dependency>  </dependencies>    <build>        <plugins>              <plugin>                  <groupId>org.springframework.boot</groupId>                  <artifactId>spring-boot-maven-plugin</artifactId>              </plugin>        </plugins>  </build>

 

2.1、eureka-client工程启动类

import org.springframework.boot.SpringApplication;  import org.springframework.boot.autoconfigure.SpringBootApplication;  import org.springframework.cloud.client.discovery.EnableDiscoveryClient;    @SpringBootApplication  @EnableDiscoveryClient  public class EurekaClientApplication {        public static void main(String[] args) {          SpringApplication.run(EurekaClientApplication.class, args);      }  }

 

2.2、eureka-client工程配置文件，路径：eureka-clientsrcmainresources，共3个文件：application.yml，application-zone1.yml，application-zone2.yml

application.yml：

#这里暴露所有的endpoints，便于后面验证
management:    endpoints:      web:        exposure:          include: '*'

application-zone1.yml：

server:    port: 8081  spring:    application:      name: client  eureka:    instance:      metadataMap.zone: zone1    client:      register-with-eureka: true      fetch-registry: true      region: region-east      service-url:        zone1: http://localhost:8761/eureka/,http://localhost:8762/eureka/        zone2: http://localhost:8763/eureka/,http://localhost:8764/eureka/      availability-zones:        region-east: zone1,zone2

application-zone2.yml：

server:    port: 8082  spring:    application:      name: client  eureka:    instance:      metadataMap.zone: zone2    client:      register-with-eureka: true      fetch-registry: true      region: region-east      service-url:        zone1: http://localhost:8761/eureka/,http://localhost:8762/eureka/        zone2: http://localhost:8763/eureka/,http://localhost:8764/eureka/      availability-zones:        region-east: zone1,zone2

 

2.3、启动eureka client，执行命令，启动2个实例：

mvn spring-boot:run -Dspring.profiles.active=zone1  mvn spring-boot:run -Dspring.profiles.active=zone2

 

3、Zuul Gateway工程

这里新建一个zuul网关工程，来演示metadataMap的zone属性中ZoneAffinity特性。

3.1、zuul gateway工程，pom文件：

<!--加上文章头部的公共依赖-->

<dependencies>          <dependency>              <groupId>org.springframework.cloud</groupId>              <artifactId>spring-cloud-starter-netflix-zuul</artifactId>          </dependency>          <dependency>              <groupId>org.springframework.cloud</groupId>              <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>          </dependency>  </dependencies>    <build>        <plugins>              <plugin>                  <groupId>org.springframework.boot</groupId>                  <artifactId>spring-boot-maven-plugin</artifactId>              </plugin>        </plugins>  </build>

 

3.2、zuul gateway工程启动类：

import org.springframework.boot.SpringApplication;  import org.springframework.boot.autoconfigure.SpringBootApplication;  import org.springframework.cloud.client.discovery.EnableDiscoveryClient;  import org.springframework.cloud.netflix.zuul.EnableZuulProxy;    @SpringBootApplication  @EnableDiscoveryClient  @EnableZuulProxy  public class ZuulGatewayApplication {        public static void main(String[] args) {          SpringApplication.run(ZuulGatewayApplication.class, args);      }  }

 

3.3、zuul gateway工程配置文件，路径：zuul-gatewaysrcmainresources，一共3个文件：application.yml，application-zone1.yml，application-zone2.yml

application.yml：

spring:    application:      name: zuul-gateway  management:    endpoints:      web:        exposure:          include: '*'

application-zone1.yml：

server:    port: 10001  eureka:    instance:      metadataMap.zone: zone1    client:      register-with-eureka: true      fetch-registry: true      region: region-east      service-url:        zone1: http://localhost:8761/eureka/,http://localhost:8762/eureka/        zone2: http://localhost:8763/eureka/,http://localhost:8764/eureka/      availability-zones:        region-east: zone1,zone2

application-zone2.yml：

server:    port: 10002  eureka:    instance:      metadataMap.zone: zone2    client:      register-with-eureka: true      fetch-registry: true      region: region-east      service-url:        zone1: http://localhost:8761/eureka/,http://localhost:8762/eureka/        zone2: http://localhost:8763/eureka/,http://localhost:8764/eureka/      availability-zones:        region-east: zone1,zone2

 

3.4、启动zuul gateway工程，一共2个实例，执行命令：

mvn spring-boot:run -Dspring.profiles.active=zone1  mvn spring-boot:run -Dspring.profiles.active=zone2

 

验证ZoneAffinity，访问：localhost:10001/client/actuator/env，结果：

 

 访问：localhost:10002/client/actuator/env，结果：

 

 可以看出请求网关/client/actuator/env，访问的是eureka client实例的/actuator/env接口，处于zone1的Gateway返回的activeProfiles为zone1，处于zone2的Gateway返回的activeProfiles是zone2。

 

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