高可用eureka服务发现实例

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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.properties

application-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 Server

HTTP 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

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    paraller
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