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Eureka实战-2【构建Multi Zone Eureka Server】

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-server/src/main/resources/,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-client/src/main/resources/,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-gateway/src/main/resources/,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:

Eureka实战-2【构建Multi Zone Eureka Server】

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

Eureka实战-2【构建Multi Zone Eureka Server】

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。

原文  http://www.cnblogs.com/idoljames/p/11620616.html
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