Eureka搭建集群

搭建服务端集群

1 创建工程并引入相关依赖

<?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>com.fangxing.springcloud</groupId>
    <artifactId>euruka-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>euruka-server</name>
    <description>Demo project for Eureka Server</description>

    <!--基于Springboot-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.0.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        <!--设置字符编码及java版本-->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--增加eureka-server的依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
        <!--用于测试的，本例可省略-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <!--依赖管理，用于管理spring-cloud的依赖，其中Camden.SR3是版本号-->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Camden.SR3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

2 开启eureka注册中心

/**
 * 开启Eureka的注册中心，只需要添加这个注解即可
 */
@EnableEurekaServer
@SpringBootApplication
public class EurukaServerApplication {

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

3 添加多实例的配置

 spring.application.name=eureka-server
 server.port=1111
 
 eureka.instance.hostname=peer1
 eureka.client.serviceUrl.defaultZone=http://peer2:2222/eureka/

 spring.application.name=eureka-server
 server.port=2222
 
 eureka.instance.hostname=peer2
 eureka.client.serviceUrl.defaultZone=http://peer1:1111/eureka/

其中：eureka.client.serviceUrl.defaultZone指的是注册中心的地址，所以两个实例互相指向。

搭建客户端集群

1 创建工程并添加依赖

<?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>com.fangxing.springcloud</groupId>
    <artifactId>euruka-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>euruka-server</name>
    <description>Demo project for Eureka Server</description>

    <!--基于Springboot-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.0.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        <!--设置字符编码及java版本-->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--增加eureka-server的依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <!--用于测试的，本例可省略-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <!--依赖管理，用于管理spring-cloud的依赖，其中Camden.SR3是版本号-->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Brixton.SR5</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

Eureka Client的pom.xml

2 开启服务发现

@EnableDiscoveryClient
@SpringBootApplication
public class EurekalclientApplication {

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

3 配置client的应用

 spring.application.name=eureka-client
 3 eureka.client.serviceUrl.defaultZone=http://peer1:1111/eureka/,http://peer2:2222/eureka/

消费Eureka Client的消息

添加对ribbon的依赖

<?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>com.fangxing.springcloud</groupId>
    <artifactId>euruka-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>euruka-server</name>
    <description>Demo project for Eureka Server</description>

    <!--基于Springboot-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.0.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        <!--设置字符编码及java版本-->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--增加eureka-server的依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <!--增加ribbon的依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-ribbon</artifactId>
        </dependency>
        <!--用于测试的，本例可省略-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <!--依赖管理，用于管理spring-cloud的依赖，其中Camden.SR3是版本号-->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Brixton.SR5</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

Eureka消费者的pom.xml

启用发现服务并开启客户端负载均衡

@EnableDiscoveryClient
@SpringBootApplication
public class RibbonConsumerApplication {

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

    //开启客户端负载均衡
    @Bean
    @LoadBalanced
    RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

配置消费者（跟生产者类似）

 spring.application.name=ribbon-consumer
 server.port=9000
 
 eureka.client.serviceUrl.defaultZone=http://peer1:1111/eureka/,http://peer2:2222/eureka/

编写消费者实例

@RestController
public class ConsumerController {

    @Autowired
    RestTemplate restTemplate;

    @RequestMapping(value = "/ribbon-consumer",method = RequestMethod.GET)
    public String helloConsumer(){
        return restTemplate.getForEntity("http://eureka-client/hello",String.class).getBody();
    }

}