根据周立的Spring Cloud & Docker那本书学习Eureka集群搭建，含实例代码

版本如下：

Spring Boot 1.5.6.RELEASE

Spring Cloud Camden.SR7

JDK 1.8

配置Eureka Server

配置pom.xml

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<?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.sss</groupId>
	<artifactId>itmuch-discovery-eureka</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>
	<name>itmuch-discovery-eureka</name>
	<description>Demo project for Spring Boot</description>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<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>Camden.SR7</spring-cloud.version>
	</properties>

	<dependencies>
		<!--Eureka注册中心-->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka-server</artifactId>
		</dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
	</dependencies>

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

配置application.yml

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spring:
  application:
    name: itmuch-discovery-eureka
  profiles:
    active: peer1 #创建3个项目分别peer2,peer3

---
server:
  port: 8762
eureka:
  client:
    service-url:
      defaultZone: http://peer1:8761/eureka/,http://peer3:8763/eureka/
  instance:
    hostname: peer2
  server:
    enable-self-preservation: false
spring:
  profiles: peer2

---
server:
  port: 8761
eureka:
  client:
    service-url:
      defaultZone: http://peer2:8762/eureka/,http://peer3:8763/eureka/
  instance:
    hostname: peer1
  server:
    enable-self-preservation: false
spring:
  profiles: peer1

---
server:
  port: 8763
eureka:
  client:
    service-url:
      defaultZone: http://peer1:8761/eureka/,http://peer2:8762/eureka/
  instance:
    hostname: peer3
  server:
    enable-self-preservation: false
spring:
  profiles: peer3

注意这里：

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server:
  enable-self-preservation: false

增加这个参数后的Eureka Server将关闭自我保护机制，这个机制在线上一般不是这样极端的关闭，而是通过调整阀值，这里为了测试服务是否能正常注销故意关闭的。如果不关闭，Eureka虽然发现服务down掉了，但是因为服务是单点的，所以会保留实例的注册记录在表内，参考我在http:///Spring4all.com 提的问题：http://spring4all.com/question/446

修改HOST

增加：

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127.0.0.1 peer1 peer2 peer3

调整Application.java

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import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class ItmuchDiscoveryEurekaApplication {

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

配置完成上边这些，项目名称分别是itmuch-discovery-eureka，itmuch-discovery-eureka-ha，itmuch-discovery-eureka-ha2，然后在IDE里启动即可

创建服务并注册

创建Provider User服务

参考项目itmuch-provider-user项目，

配置pom.xml

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<?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.sss</groupId>
	<artifactId>itmuch-provider-user</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>itmuch-provider-user</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<!-- 健康检查 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<!-- 注册服务 -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
		<dependency>
			<groupId>com.h2database</groupId>
			<artifactId>h2</artifactId>
		</dependency>

		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</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.SR7</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>

配置Application.java

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import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@EnableDiscoveryClient
@SpringBootApplication
public class Application {

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

配置application.yml

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server:
  port: 8000
spring:
  application:
    name: itmuch-provider-user
  jpa:
    generate-ddl: false
    show-sql: true
    hibernate:
      ddl-auto: none
  datasource:                           # 指定数据源
    platform: h2                        # 指定数据源类型
    schema: classpath:schema.sql        # 指定h2数据库的建表脚本
    data: classpath:data.sql            # 指定h2数据库的数据脚本
logging:                                # 配置日志级别，让hibernate打印出执行的SQL
  level:
    root: INFO
    org.hibernate: INFO
    org.hibernate.type.descriptor.sql.BasicBinder: TRACE
    org.hibernate.type.descriptor.sql.BasicExtractor: TRACE

#监控的信息配置 http://{host}:{port}/info
info:
  app:
    name: @project.artifactId@
    encoding: @project.build.sourceEncoding@
    java:
      source: @java.version@
      target: @java.version@

#注册服务
eureka:
  client:
    service-url:
      defaultZone: http://peer1:8761/eureka/,http://peer2:8762/eureka/,http://peer3:8763/eureka/
  instance:
    prefer-ip-address: true

创建配置完成后启动服务，刷新Eureka的页面即可看到对应服务已经存在。

创建Customer Movie服务

该服务调用Provider User服务,参考项目itmuch-customer-movie.

配置pom.xml

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<?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.sss</groupId>
	<artifactId>itmuch-consumer-movie</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>itmuch-consumer-movie</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<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>Camden.SR7</spring.cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</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>${spring.cloud.version}</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>

配置Application.java

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import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@EnableDiscoveryClient
@SpringBootApplication
public class Application {

	@Bean
	public RestTemplate restTemplate(){
		return new RestTemplate();
	}

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

配置application.yml

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server:
  port: 8100
spring:
  application:
    name: itmuch-customer-movie
logging:                                # 配置日志级别，让hibernate打印出执行的SQL
  level:
    root: INFO
    org.hibernate: INFO
    org.hibernate.type.descriptor.sql.BasicBinder: TRACE
    org.hibernate.type.descriptor.sql.BasicExtractor: TRACE

#监控的信息配置 http://{host}:{port}/info
info:
  app:
    name: @project.artifactId@
    encoding: @project.build.sourceEncoding@
    java:
      source: @java.version@
      target: @java.version@


#注册服务
eureka:
  client:
    service-url:
      defaultZone: http://peer1:8761/eureka/,http://peer2:8762/eureka/,http://peer3:8763/eureka/
  instance:
    prefer-ip-address: true

创建配置完成后启动服务，刷新Eureka的页面即可看到对应服务已经存在。

至此：一个简单的Eureka服务已经搭建完成了，下面附送源码，可以直接在github上下载下来运行。

附件

传送门：https://github.com/icnws/eureka-simple-ha-demo

简单记录，有待深入挖坑！欢迎留言交流！