springcloud（三，高可用eureka，集群eureka）

青旅半醒 2023-06-18 06:55 19阅读 0赞

### 文章目录 ###

*   *  为什么要集群eureka
     *  搭建集群
     *  服务注册
     *  启动测试

## 为什么要集群eureka ##

*  如果我们只有一个注册中心eureka，这个注册中心如果挂了我们所有服务就直接全部挂了，所以我们需要对eureka做集群

## 搭建集群 ##

1.  创建两个eureka  
    ![在这里插入图片描述][20191130210949601.png]  
    父依赖

<?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.zou</groupId>
        <artifactId>springcloud-shopping-parent</artifactId>
        <version>1.0-SNAPSHOT</version>
        <modules>
            <module>springcloud-shopping-eurekaserver</module>
            <module>springcloud-shopping-eurekaserver1</module>
        </modules>
        <packaging>pom</packaging>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.1.RELEASE</version>
            <relativePath/>
        </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>Finchley.M9</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-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>
    
    
        
        <repositories>
            <repository>
                <id>spring-milestones</id>
                <name>Spring Milestones</name>
                <url>https://repo.spring.io/libs-milestone</url>
                <snapshots>
                    <enabled>false</enabled>
                </snapshots>
            </repository>
        </repositories>
    
    </project>

两个eureka的依赖一致

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

1.  springcloud-shopping-eurekaserver配置文件 application.yml

###服务端口号
    server:
      port: 8009
    ###eureka 基本信息配置
    spring:
      application:
        name: eureka-server
    
    eureka:
      instance:
        ###注册到eureka ip地址
         hostname: 127.0.0.1
      client:
        serviceUrl:
          defaultZone: http://127.0.0.1:8100/eureka/
        ###集群改为true注册到其他eureka
        register-with-eureka: true
        ###群改为true注册到其他eureka
        fetch-registry: true

*  这里与单机版不同的是 register-with fetch-registry都改为 true
 *  `defaultZone: http://127.0.0.1:8100/eureka/`地址为需要注册的另一台eureka 地址，如果是多台以上用逗号隔开如(`defaultZone: http://127.0.0.1:8100/eureka/,http://127.0.0.1:8008/eureka/`)
 *  集群必须要有项目名，即spring.application.name,且必须相同

1.  springcloud-shopping-eurekaserver1配置文件 application.yml

###服务端口号
    server:
      port: 8100
    ###eureka 基本信息配置
    spring:
      application:
        name: eureka-server
    
    eureka:
      instance:
        ###注册到eureka ip地址
         hostname: 127.0.0.1
      client:
        serviceUrl:
          defaultZone: http://127.0.0.1:8009/eureka/
        ###集群改为true注册到其他eureka
        register-with-eureka: true
        ###群改为true注册到其他eureka
        fetch-registry: true

*  唯一不同为`defaultZone: http://127.0.0.1:8009/eureka/`

启动类  
EurekaServer.java

@SpringBootApplication
    @EnableEurekaServer
    public class EurekaServer { 
        public static void main(String[] args) { 
            SpringApplication.run(EurekaServer.class);
    
        }
    }

## 服务注册 ##

这里我们服务使用 springcloud-shopping-member  
配置文件 application.yml

server:
      port: 9100
    spring:
      application:
        name: shopping-member
    eureka:
      client:
        service-url:
          defaultZone: http://127.0.0.1:8009/eureka/,http://127.0.0.1:8100/eureka/
        register-with-eureka: true
        fetch-registry: true

*  这里需要注意的是集群环境下defaultZone也要写两台eureka地址

## 启动测试 ##

*  最先启动的eureka肯定会报错，因为另一台eureka还没有启动，这里不用担心
 *  后启动的eureka需要等几秒刷新才能看到最新启动的eureka注册上来

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjUxOTA0_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][20191130213143275.png]

> 这里可以看到两台服务中心相互注册，但是shopping-member只在y一个eureka注册（8100），这是因为在注册过程中会保证只有一个注册中心，只有当8009eureka挂了的情况下，才会注册到8009上去

*  我们现在停掉8009eureka测试  
    ![在这里插入图片描述][20191130213801319.png]

[20191130210949601.png]: https://img-blog.csdnimg.cn/20191130210949601.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjUxOTA0_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191130213126476.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjUxOTA0,size_16,color_FFFFFF,t_70
[20191130213143275.png]: https://img-blog.csdnimg.cn/20191130213143275.png
[20191130213801319.png]: https://img-blog.csdnimg.cn/20191130213801319.png