purpose:

Eureka Cluster Setup

　　He said point is easy to understand, with a project deployed on multiple servers.

When the registry could not carry high concurrent time, this time to use clusters to carry;

　　Today introduced two ways to build:

The first way ordinary way:

And then built on the blog post on the two projects, and the configuration of these two projects can not are local, open three virtual machines too much trouble, so we direct to configure local hosts to achieve the machine domain mapping
into the your system file: C: \ Windows \ System32 \ the Drivers \ etc to find the hosts file , and then add your domain name mapping, behind the configuration file in yml

127.0.0.1  eureka2001.ht.com
127.0.0.1  eureka2002.ht.com
127.0.0.1  eureka2003.ht.com

Create three POM dependent on the same project Springboot

microservice-eureka-server-2001
microservice-eureka-server-2002
microservice-eureka-server-2003

pom-dependent

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.ht</groupId>
        <artifactId>htSpringCloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>microservice-eureka-server-2003</artifactId>

    <properties>
        <java.version>1.8</java.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>
        <!--  修改后立即生效，热部署  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

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

</project>

The second step yml configuration file

microservice-eureka-server-2001

Server: 
  Port: 2001 
  context -path: / 

Eureka: 
  instance: 
    # single hostname: localhost #eureka registry instance name 
    hostname: eureka2001.ht.com # cluster 
  Client: 
    the Register the -with-Eureka: false      # false Because the application is registered center, so set to false, the representative does not register itself with the registry. 
    FETCH -registry: false      # false because the responsibility is to maintain a registry of service instances, it does not need to retrieve the service, so it is set to false 
    Service - url: 
      defaultzone: HTTP: // eureka2002.ht.com:2002/eureka/ , http://eureka2003.ht.com : 2003 / Eureka / cluster #

microservice-eureka-server-2002

Server: 
  Port: 2002 
  context -path: / 
Eureka: 
  instance: 
    # single hostname: localhost #eureka registry instance name 
    hostname: eureka2002.ht.com # cluster 
  Client: 
    the Register the -with-Eureka: false      # false Because the application is registered center, so set to false, the representative does not register itself with the registry. 
    FETCH -registry: false      # false because the responsibility is to maintain a registry of service instances, it does not need to retrieve the service, so it is set to false 
    Service - url: 
      defaultzone: HTTP: // eureka2001.ht.com:2001/eureka/ , http://eureka2003.ht.com : 2003 / Eureka / cluster # 
      # single defaultZone: http:// $ {eureka.instance.hostname}: $ {server.port} / Eureka / Eureka # Set the registry interactive address, use the query service and registration services

microservice-eureka-server-2003

Server: 
  Port: 2003 
  context -path: / 
Eureka: 
  instance: 
    # single hostname: localhost #eureka registry instance name 
    hostname: eureka2003.ht.com # cluster 
  Client: 
    the Register the -with-Eureka: false      # false Because the application is registered center, so set to false, the representative does not register itself with the registry. 
    FETCH -registry: false      # false because the responsibility is to maintain a registry of service instances, it does not need to retrieve the service, so it is set to false 
    Service - url: 
      defaultzone: HTTP: // eureka2001.ht.com:2001/eureka/ , http://eureka2002.ht.com : 2002 / Eureka / cluster # 
      # single defaultZone: http:// $ {eureka.instance.hostname}: $ {server.port} / Eureka / Eureka # Set the registry interactive address, use the query service and registration services

To the service provider to modify application.yml reconfigure eureka

Server: 
  Port: 1001 
  context -path: / 
the Spring: 
  the DataSource: 
    of the type: com.alibaba.druid.pool.DruidDataSource 
    Driver - class - name: com.mysql.jdbc.Driver 
    url: jdbc: MySQL: // localhost: 3306 / ? useUnicode the Test & characterEncoding to true = = utf8 
    username: root 
    password: root 
  JPA: 
    Hibernate: 
      DDL - Auto: Update 
    Show -sql: to true 
Eureka: 
  instance: 
    #eureka instance name of the client host 
    hostname: localhost 
    # client service name
    appname: microservice-student
    # The client instance name 
    instance-the above mentioned id: microService-Student: 1001 
    # show IP 
    the prefer-ip-address: to true 
  Client: 
    Service-url: 
      defaultzone: http://eureka2001.ht.com:2001/eureka/, HTTP: / /eureka2002.ht.com : 2002 / Eureka /, http://eureka2003.ht.com : 2003 / Eureka /
 info: 
  groupId: com.ht.htSpringCloud 
  artifactId: microService -student-Provider-1001 
  Version: 1.0- SNAPSHOT 
  userName : HTTP: // ht.com 
  Phone: 123456

Remember annotate @EnableEurekaServer start in each class

Run the file path to your own configuration

127.0.0.1 eureka2001.ht.com
127.0.0.1 eureka2002.ht.com
127.0.0.1 eureka2003.ht.com

The second way Sao operation　

The above eureka service structures, in addition to yml file is not the same, other files are the same, so is there any way we can be more eureka set of services to a project go?

Create a Eureka-Server-microService (triple) sub-projects

Pom-dependent

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.ht</groupId>
        <artifactId>htSpringCloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>microservice-eureka-server</artifactId>

    <properties>
        <java.version>1.8</java.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>
        <!-- 修改后立即生效，热部署 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

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

</project>

Yml configuration file

---
server:
  port: 2001
  context-path: /
eureka:
  instance:
    hostname: eureka2001.ht.com
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://eureka2002.ht.com:2002/eureka/,http://eureka2003.ht.com:2003/eureka/
spring:
  profiles: eureka2001
---
server:
  port: 2002
  context-path: /
eureka:
  instance:
    hostname: eureka2002.ht.com
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://eureka2001.ht.com:2001/eureka/,http://eureka2003.ht.com:2003/eureka/
spring:
  profiles: eureka2002
---
server:
  port: 2003
  context-path: /
eureka:
  instance:
    hostname: eureka2003.ht.com
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://eureka2001.ht.com:2001/eureka/,http://eureka2002.ht.com:2002/eureka/
spring:
  profiles: eureka2003

Remember to add in the startup class @EnableEurekaServer

package com.ht.microserviceeurekaserver;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class MicroserviceEurekaServerApplication {

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

}

效果：

Eureka自我保护机制
如果在服务注册中心注册过的服务提供者突然失去了联系的话，服务注册中心不会立即注销掉该服务提供者的信息，而是会等个90秒再注销。
这样就使得Eureka集群更加的健壮和稳定

SpringCloud - eureka cluster

purpose:

The first common way

The second way Sao operation

Eureka Cluster Setup

The first way ordinary way:

Create three POM dependent on the same project Springboot

The second way Sao operation

谢谢观看！

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