Tìm hiểu về Spring Cloud Eureka Server với ví dụ

<?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.o7planning</groupId>
    <artifactId>SpringCloudServiceRegistrationEurekaServer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>SpringCloudServiceRegistrationEurekaServer</name>
    <description>Spring Cloud Service Registration (Eureka Server)</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.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>Edgware.RELEASE</spring-cloud.version>
    </properties>

    <dependencies>
        <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>
            <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>

package org.o7planning.eurekaserver;

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

@EnableEurekaServer
@SpringBootApplication
public class SpringCloudServiceRegistrationEurekaServerApplication {

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

---
# This default profile is used when running a single instance completely standalone:
spring:
  profiles: default
server:
  port: 9000  
eureka:
  instance:
    hostname: my-eureka-server.com
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/    

# united-states, france, and vietnam illustrate running 3 intercommunicating instances.  
# This example has them running side-by-side on localhost
# -- which is unrealistic in production
# -- but does illustrate how multiple instances collaborate.
#
# Run by opening 3 separate command prompts:
# java -jar -Dspring.profiles.active=united-states SpringCloudServiceRegistrationEurekaServer.jar
# java -jar -Dspring.profiles.active=france SpringCloudServiceRegistrationEurekaServer.jar
# java -jar -Dspring.profiles.active=vietnam SpringCloudServiceRegistrationEurekaServer.jar

---
spring:
  profiles: united-states
  application:
    name: eureka-server-clustered   # ==> This is Service-Id
server:
  port: 9001  
eureka:
  instance:
    hostname: my-eureka-server-us.com    
  client:
    registerWithEureka: true
    fetchRegistry: true        
    serviceUrl:
      defaultZone: http://my-eureka-server-fr.com:9002/eureka/,http://my-eureka-server-vn.com:9003/eureka/

---
spring:
  profiles: france
  application:
    name: eureka-server-clustered   # ==> This is Service-Id   
server:
  port: 9002
eureka:
  instance:
    hostname: my-eureka-server-fr.com      
  client:
    registerWithEureka: true
    fetchRegistry: true        
    serviceUrl:
      defaultZone: http://my-eureka-server-us.com:9001/eureka/,http://my-eureka-server-vn.com:9003/eureka/

---
spring:
  profiles: vietnam
  application:
    name: eureka-server-clustered    # ==> This is Service-Id  
server:
  port: 9003
eureka:
  instance:
    hostname: my-eureka-server-vn.com    
  client:
    registerWithEureka: true
    fetchRegistry: true    
    serviceUrl:
      defaultZone: http://my-eureka-server-us.com:9001/eureka/,http://my-eureka-server-fr.com:9002/eureka/

127.0.0.1       my-eureka-server.com
127.0.0.1       my-eureka-server-us.com
127.0.0.1       my-eureka-server-fr.com
127.0.0.1       my-eureka-server-vn.com

java -jar -Dspring.profiles.active=united-states SpringCloudServiceRegistrationEurekaServer-0.0.1-SNAPSHOT.jar

java -jar -Dspring.profiles.active=france SpringCloudServiceRegistrationEurekaServer-0.0.1-SNAPSHOT.jar

java -jar -Dspring.profiles.active=vietnam SpringCloudServiceRegistrationEurekaServer-0.0.1-SNAPSHOT.jar