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spring:
application:

name: eureka-server-clustered3

profiles: peer3
server:
port: 9763
host: serverA
eureka:
instance:

hostname: eureka-peer3
preferIpAddress: true
instance-id: ${spring.cloud.client.ipAddress}:${server.port}:${spring.application.name}

client:

registerWithEureka: true
fetchRegistry: true
serviceUrl:defaultZone: http://${server.host}:9761/eureka/,http://${server.host}:9762/eureka/

##### 配置2: application.propertiesapplication-peer1.properties

eureka.client.fetchRegistry=true
eureka.client.registerWithEureka=true
eureka.client.serviceUrl.defaultZone=http://serverA:9762/eureka/,http://serverA:9763/eureka/
eureka.instance.hostname=serverA
eureka.instance.metadataMap.instanceId=${spring.application.name}\:${spring.application.instance_id:${random.value}}
eureka.server.waitTimeInMsWhenSyncEmpty=0
server.port=9761
spring.application.name=server_peer1

application-peer2.properties

eureka.client.fetchRegistry=true
eureka.client.registerWithEureka=true
eureka.client.serviceUrl.defaultZone=http://serverA:9761/eureka/,http://serverA:9763/eureka/
eureka.instance.hostname=serverA
eureka.server.waitTimeInMsWhenSyncEmpty=0
server.port=9762
eureka.instance.metadataMap.instanceId=${spring.application.name}\:${spring.application.instance_id:${random.value}}
spring.application.name=server_peer2

application-peer3.properties

eureka.client.fetchRegistry=true
eureka.client.registerWithEureka=true
eureka.client.serviceUrl.defaultZone=http://serverA:9761/eureka/,http://serverA:9762/eureka/
eureka.instance.hostname=serverA
eureka.server.waitTimeInMsWhenSyncEmpty=0
server.port=9763
eureka.instance.metadataMap.instanceId=${spring.application.name}\:${spring.application.instance_id:${random.value}}
spring.application.name=server_peer3

##### 本地跑测试的时候，需要编辑 etc/hosts

127.0.0.1 serverA

##### Dockerfile 文件

FROM java:7
VOLUME /tmp
ADD eureka-0.0.1-SNAPSHOT.jar /app.jar
RUN bash -c 'touch /app.jar'
EXPOSE 9762
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

##### pom.xml 

<?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>org.demo</groupId>
<artifactId>eureka</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging><name>Eureka Server</name>
<description>Eureka Server demo project</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.4.3.RELEASE</version><relativePath />
</parent>

<properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><!-- springBoot 程序的主入口 --><start-class>eurekademo.EurekaApplication</start-class> <java.version>1.7</java.version><docker.registry>docker.umiit.cn:5043</docker.registry></properties><profiles><profile><id>dev</id><properties><env>dev</env></properties><activation><activeByDefault>true</activeByDefault></activation></profile><profile><id>peer1</id><properties><env>peer1</env><docker>peer1</docker></properties></profile><profile><id>peer2</id><properties><env>peer2</env><docker>peer2</docker></properties></profile><profile><id>peer3</id><properties><env>peer3</env><docker>peer3</docker></properties></profile>
</profiles><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka-server</artifactId><version>1.3.0.RELEASE</version></dependency><!-- <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId> </dependency> --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency>
</dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Camden.SR6</version><type>pom</type><scope>import</scope></dependency></dependencies>
</dependencyManagement>

<build><plugins><plugin><groupId>com.spotify</groupId><artifactId>docker-maven-plugin</artifactId><version>0.2.11</version><configuration><pushImage>true</pushImage><imageName>${docker.registry}/v3/${project.artifactId}:${docker}</imageName><dockerDirectory>src/main/resources_${env}/docker</dockerDirectory><resources><resource><targetPath>/</targetPath><directory>${project.build.directory}</directory><include>${project.build.finalName}.jar</include></resource></resources></configuration></plugin><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><!-- defined in spring-cloud-starter-parent pom (as documentation hint), but needs to be repeated here --><configuration><requiresUnpack><dependency><groupId>com.netflix.eureka</groupId><artifactId>eureka-core</artifactId></dependency><dependency><groupId>com.netflix.eureka</groupId><artifactId>eureka-client</artifactId></dependency></requiresUnpack></configuration></plugin><plugin><groupId>pl.project13.maven</groupId><artifactId>git-commit-id-plugin</artifactId><configuration><failOnNoGitDirectory>false</failOnNoGitDirectory></configuration></plugin><plugin><!--skip deploy (this is just a test module) --><artifactId>maven-deploy-plugin</artifactId><configuration><skip>true</skip></configuration></plugin><plugin><groupId>org.codehaus.mojo</groupId><artifactId>build-helper-maven-plugin</artifactId><executions><execution><id>add-resource</id><phase>initialize</phase><goals><goal>add-resource</goal></goals><configuration><resources><resource><directory>src/main/resources_${env}</directory></resource></resources></configuration></execution></executions></plugin></plugins>
</build><repositories><repository><id>spring-snapshots</id><name>Spring Snapshots</name><url>https://repo.spring.io/libs-snapshot-local</url><snapshots><enabled>true</enabled></snapshots></repository><repository><id>spring-milestones</id><name>Spring Milestones</name><url>https://repo.spring.io/libs-milestone-local</url><snapshots><enabled>false</enabled></snapshots></repository><repository><id>spring-releases</id><name>Spring Releases</name><url>https://repo.spring.io/libs-release-local</url><snapshots><enabled>false</enabled></snapshots></repository>
</repositories>
<pluginRepositories><pluginRepository><id>spring-snapshots</id><name>Spring Snapshots</name><url>https://repo.spring.io/libs-snapshot-local</url><snapshots><enabled>true</enabled></snapshots></pluginRepository><pluginRepository><id>spring-milestones</id><name>Spring Milestones</name><url>https://repo.spring.io/libs-milestone-local</url><snapshots><enabled>false</enabled></snapshots></pluginRepository>
</pluginRepositories>

</project>

##### .gitlab-ci.yml

image: docker.umiit.cn:5043/maven_docker:latest

stages:

• build

run_build_peer1:
stage: build
tags:

- docker

only:

- develop

script:

- mvn clean package docker:build -Ppeer1

run_build_peer2:
stage: build
tags:

- docker

only:

- develop

script:

- mvn clean package docker:build -Ppeer2

run_build_peer3:
stage: build
tags:

- docker

only:

- develop

script:

- mvn clean package docker:build -Ppeer3

##### docker-compose.yml 

eureka_1:
image: docker.umiit.cn:5043/v3/eureka:peer1
volumes:

- /etc/localtime:/etc/localtime:ro
- /etc/timezone:/etc/timezone:ro
- /mnt/docker-data/logstash/eureka_1:/usr/local/tomcat/logs

environment:

spring.profiles.active: peer1

ports:

- "公网IP:9761:9761"

eureka_2:
image: docker.umiit.cn:5043/v3/eureka:peer2
volumes:

- /etc/localtime:/etc/localtime:ro
- /etc/timezone:/etc/timezone:ro
- /mnt/docker-data/logstash/eureka_2:/usr/local/tomcat/logs

environment:

spring.profiles.active: peer2

ports:

- "公网IP:9762:9762"

eureka_3:
image: docker.umiit.cn:5043/v3/eureka:peer3
volumes:

- /etc/localtime:/etc/localtime:ro
- /etc/timezone:/etc/timezone:ro
- /mnt/docker-data/logstash/eureka_2:/usr/local/tomcat/logs

environment:

spring.profiles.active: peer3

ports:

- "公网IP:9763:9763"

##### 项目结构

|-- src/main/resources_peer1
|-- src/main/resources_peer2
|-- src/main/resources_peer3

放置 Dockerfile & application.yml

##### 本地测试

mvn package

java -jar eureka-server-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer1
java -jar eureka-server-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer2
java -jar eureka-server-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer3

### 客户端配置##### application.yml

server:
port: ${vcap.application.port:9099}

eureka:
instance:

preferIpAddress: true

client:

serviceUrl:defaultZone: http://${serverA}:9761/eureka/,http://${serverA}:9762/eureka/,http://${serverA}:9763/eureka/
registerWithEureka: true
fetchRegistry: true

##### docker-compose.yml

ticketservice:
image: docker.umiit.cn:5043/v3/ticket-service:prep
volumes:

- /etc/localtime:/etc/localtime:ro
- /etc/timezone:/etc/timezone:ro
- /mnt/docker-data/logstash/ticketservice:/logs

external_links:

- common_mysql_1:mysqlDb
- common_redis_1:redisDb
- common_mongo_1:mongoDb

environment:

serverA: localhost
JVM_ARGS: -Xmx1024m

ports:

- "0.0.0.0:9099:9099"

yeaservice:
image: docker.umiit.cn:5043/v3/yea-service:ipc
volumes:

- /etc/localtime:/etc/localtime:ro
- /etc/timezone:/etc/timezone:ro
- /mnt/docker-data/logstash/yeaservice:/logs

external_links:

- common_mysql_1:mysqlDb
- common_redis_1:redisDb
- common_mongo_1:mongoDb

environment:

serverA: localhost
JVM_ARGS: -Xmx1024m

ports:

- "0.0.0.0:8081:8081"

hystrix-dashboard:
image: kennedyoliveira/hystrix-dashboard
ports:

- "0.0.0.0:7979:7979"

environment:

JVM_ARGS: -Xmx512m

##### yeaservice - Application.java

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
@EnableDiscoveryClient
@EnableCircuitBreaker
@EnableHystrixDashboard
@RibbonClient(name = "yea-ribbon", configuration = YeaRibbonConfiguration.class)
@ComponentScan(basePackages = { "com.**" })
public class Application {

public static void main(String[] args) {SpringApplication.run(Application.class, args);
}

}

##### yeaservice - 调用 ticketservice

@FeignClient(value = "ticket-service")
interface TicketClient {

}

这里使用了Feign的框架演示。### 查看结果

curl -i IP:9761/ # 在浏览器中输入网址

## 官方知识点### Authenticating with the Eureka ServerHTTP basic authentication will be automatically added to your eureka client if one of the eureka.client.serviceUrl.defaultZone URLs has credentials embedded in it (curl style, like http://user:password@localhost:8761/eureka). For more complex needs you can create a @Bean of type DiscoveryClientOptionalArgs and inject ClientFilter instances into it, all of which will be applied to the calls from the client to the server.### Zones希望在不同的Zone中配置你的客户端，首先要确认你的Eureka servers 部署在不同的Zone中，并且互相连接了，接下来要告诉Server你的服务实例在哪里，你可以使用`metadataMap`属性,例如像下面这样配置：##### Service 1 in Zone 1

eureka.instance.metadataMap.zone = zone1
eureka.client.preferSameZoneEureka = true

##### Service 1 in Zone 2

eureka.instance.metadataMap.zone = zone2
eureka.client.preferSameZoneEureka = true

NOTE
Because of a limitation in Eureka it isn’t possible to support per-server basic auth credentials, so only the first set that are found will be used.### 单例模式如果是单例模式的话，不必开启下面的选项，因为心跳检测会不断的进行，会报错连接不上。

eureka:
instance:

hostname: localhost

client:

registerWithEureka: false            ## this
fetchRegistry: false                ## this
serviceUrl:defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

## 参考链接[如何实现微服务架构中的服务发现](http://www.jiagoushuo.com/article/1000415.html)[Microservice Registration and Discovery with Spring Cloud and Netflix's Eureka](https://spring.io/blog/2015/01/20/microservice-registration-and-discovery-with-spring-cloud-and-netflix-s-eureka)[Spring Cloud构建微服务架构（一）服务注册与发现](http://blog.didispace.com/springcloud1/)[Spring Cloud Netflix](http://cloud.spring.io/spring-cloud-static/spring-cloud-netflix/1.2.7.RELEASE/)## QA **使用serverA 的域名配置，修改宿主机的  /etc/hosts ，不能集群连接**需要在docker容器中配置 /etc/hosts, 所以 vim Dockerfile 

RUN echo '10.45.189.178 serverA' >> /etc/hosts

重新启动，发现还是无效，cat /etc/hosts 没有写进serverA 的映射，后面推测应该是容器的/etc/hosts是动态生成的，所以这个语句无效。
从环境变量开始入手
docker-compose.yml 

environment:
serverA: 内网IP