基于Eureka Server实现服务注册高可用

野性酷女 2022-05-19 07:22 214阅读 0赞

# 基于Eureka Server实现服务注册高可用 #

## 概述 ##

[基于Eureka Server实现服务注册][Eureka Server]这篇文章中讲解了`Eureka Server`单机环境的搭建。  
这篇文章将讲述如何实现`Eureka Server`高可用

## 实现步骤分析 ##

### 引入Eureka Server依赖 ###

<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>

### 创建application.yml文件 ###

spring:
      application:
        name: eureka-server-peer
    eureka:
      client:
        register-with-eureka: false # 表示不向注册中心注册
        fetch-registry: false # 由于注册中心的职责就是维护服务实例，所以它不需要去检索服务
    
    ---
    spring:
      profiles: peer1
    server:
      port: 8761
    eureka:
      instance:
        hostname: peer1
      client:
        service-url:
          defaultZone: http://peer2:8762/eureka/
    
    ---
    spring:
      profiles: peer2
    server:
      port: 8762
    eureka:
      instance:
        hostname: peer2
      client:
        service-url:
          defaultZone: http://peer1:8761/eureka/

注意：这个配置分为三部分，每一部分通过`---`来分割。  
第一部分配置了`Eureka Server`高可用配置的公共部分，例如：应用名称、禁止把自身当做服务来注册  
第二部分是`peer1`节点的配置，第三部分是`peer2`节点的配置。  
由于当前是在一台主机上模拟`Eureka Server`高可用，所以`peer1`和`peer2`两个主机需要提前在`hosts`文件中注册一下。  
注册方式：使用`vim`编辑本机`hosts`文件($ sudo vim /etc/hosts)，并在其中添加`127.0.0.1 peer1 peer2`主机映射

`register-with-eureka: false`和`fetch-registry: false`这两个属性是需要配置一下的，如果不配置将会出现问题（问题详情：[https://blog.csdn.net/mynameissls/article/details/81157033][https_blog.csdn.net_mynameissls_article_details_81157033]）。

### 创建Eureka Server启动类 ###

import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
    
    @SpringBootApplication
    @EnableEurekaServer
    public class EurekaServerApplication { 
        public static void main(String[] args) throws Exception {
            SpringApplication.run(EurekaServerApplication.class, args);
        }
    }

### 启动Eureka Server ###

启动`peer1`节点：`java -jar springcloud-eureka-server-peer-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer1`  
启动`peer2`节点：`java -jar springcloud-eureka-server-peer-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer2`

启动成功后，可以在浏览器中分别访问[http://peer1:8761/][http_peer1_8761]和[http://peer2:8762/][http_peer2_8762]来查看`Eureka Server`高可用服务注册  
如下图：  
[http://peer1:8761/][http_peer1_8761]  
![这里写图片描述][70]

[http://peer2:8762/][http_peer2_8762]  
![这里写图片描述][70 1]

源代码链接：  
[https://github.com/myNameIssls/springcloud-study/tree/master/springcloud-eureka-server-peer][https_github.com_myNameIssls_springcloud-study_tree_master_springcloud-eureka-server-peer]

参考链接:  
[http://cloud.spring.io/spring-cloud-static/Finchley.RELEASE/single/spring-cloud.html\#spring-cloud-eureka-server-peer-awareness][http_cloud.spring.io_spring-cloud-static_Finchley.RELEASE_single_spring-cloud.html_spring-cloud-eureka-server-peer-awareness]

[Eureka Server]: https://blog.csdn.net/myNameIssls/article/details/81154755
[https_blog.csdn.net_mynameissls_article_details_81157033]: https://blog.csdn.net/mynameissls/article/details/81157033
[http_peer1_8761]: http://peer1:8761/
[http_peer2_8762]: http://peer2:8762/
[70]: /images/20220519/20959e14a7274080b1cc96969a1d4518.png
[70 1]: /images/20220519/591c70b7c1e5446481d5362b60aa11a7.png
[https_github.com_myNameIssls_springcloud-study_tree_master_springcloud-eureka-server-peer]: https://github.com/myNameIssls/springcloud-study/tree/master/springcloud-eureka-server-peer
[http_cloud.spring.io_spring-cloud-static_Finchley.RELEASE_single_spring-cloud.html_spring-cloud-eureka-server-peer-awareness]: http://cloud.spring.io/spring-cloud-static/Finchley.RELEASE/single/spring-cloud.html#spring-cloud-eureka-server-peer-awareness