SpringCloud之搭建Eureka Server HA⾼可⽤集群

  在互联网应用中，服务实例很少有单个的。

  即使微服务消费者会缓存服务列表，但是如果EurekaServer只有一个实例，该实例挂掉，正好微服务消费者本地缓存列表中服务实例也不可用，那么这个时候整个系统都受影响。

  在⽣产环境中，我们会配置Eureka Server集群实现⾼可⽤。Eureka Server集群之中的节点通过点对点（P2P）通信的⽅式共享服务注册表。我们开启两台 Eureka Server 以搭建集群。

在本地模拟多个电脑步骤：

1.在host文件中的添加配置

2.在文件中添加2个服务的名称：FrankCloudEurekaServerB、FrankCloudEurekaServerA

 

3.代码结构

4.2个服务端中的一个代码结构

 5.FrankCloudEurekaServerApplication8761 中的代码结构

package com.frank.edu;

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

@SpringBootApplication
@EnableEurekaServer
public class FrankCloudEurekaServerApplication8761 {
    public static void main(String[] args) {
        SpringApplication.run(FrankCloudEurekaServerApplication8761.class,args);
    }
}

6.配置项application.yml

server:
  port: 8761
spring:
  application:
    name: frank-cloud-eureka-server

eureka:
  instance:
    hostname: FrankCloudEurekaServerA
  client:
    fetch-registry: true
    register-with-eureka: true
    serviceUrl:
      defaultZone: http://FrankCloudEurekaServerB:8762/eureka

 7.FrankCloudEurekaServerApplication8762中代码

package com.frank.edu;

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

@SpringBootApplication
@EnableEurekaServer
public class FrankCloudEurekaServerApplication8762 {
    public static void main(String[] args) {
        SpringApplication.run(FrankCloudEurekaServerApplication8762.class,args);
    }
}

8.配置项application.yml

spring:
  application:
    name: frank-cloud-eureka-server

server:
  port: 8762


eureka:
  instance:
    hostname: FrankCloudEurekaServerB
  client:
    register-with-eureka: true
    fetch-registry: true
    service-url:
      defaultZone: http://FrankCloudEurekaServerA:8761/eureka

9.分别启动2个服务，在浏览器中分别查看http://localhost:8761/；http://localhost:8762

 

10.父模块的pom导入

<?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>
    <packaging>pom</packaging>
    <modules>
        <module>frank-cloud-eureka-server8761</module>
        <module>frank-cloud-eureka-server8762</module>
        <module>frank-cloud-oauth-server-9999</module>
        <module>frank-service-resume-8080</module>
        <module>frank-service-common</module>
        <module>frank-service-autodeliver-9090</module>
    </modules>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.frank.edu</groupId>
    <artifactId>frank-parent</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>frank-parent</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <!--导入springCloud依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--引⼊Jaxb，开始-->
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-core</artifactId>
            <version>2.2.11</version>
        </dependency>
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-impl</artifactId>
            <version>2.2.11</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jaxb</groupId>
            <artifactId>jaxb-runtime</artifactId>
            <version>2.2.10-b140310.1920</version>
        </dependency>
        <dependency>
            <groupId>javax.activation</groupId>
            <artifactId>activation</artifactId>
            <version>1.1.1</version>
        </dependency>
        <!--引⼊Jaxb，结束-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.4</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>


    </dependencies>

    <build>
        <plugins>
            <!--编译插件-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>8</source>
                    <target>8</target>
                    <encoding>utf-8</encoding>
                </configuration>
            </plugin>
            <!--打包插件-->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

2个服务模块中的一个pom文件

<?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">
    <parent>
        <artifactId>frank-parent</artifactId>
        <groupId>com.frank.edu</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>frank-cloud-eureka-server8761</artifactId>
    <dependencies>
        <!--Eureka server依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>


</project>

 11.代码随后附上git地址。。。。