springboot+eureka集群搭建

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eureka集群搭建
此集群共有三个eureka台组成
eureka集群的核心思想就是互相注册，相互守望，你中有我，我中有你(个人理解)
意思就是第一台机器01注册地址defaultZone中的地址是02，03的，02的注册地址是01，03的。03的注册地址是01，02的
首先新建三个项目来代表eureka的三台机器
父类的pom文件大家可以一起用

<?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.atguigu.springcloud</groupId>
  <artifactId>cloud2020</artifactId>
  <version>1.0-SNAPSHOT</version>
    <modules>
        <module>cloud-provider-payment8001</module>
      <module>cloud-consumer-order80</module>
        <module>cloud-api-commons</module>
        <module>cloud-eureka-server7001</module>
      <module>cloud-eureka-server7002</module>
      <module>cloud-eureka-server7003</module>

    </modules>
    <packaging>pom</packaging>

  <!-- 统一管理jar包版本 -->
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <junit.version>4.12</junit.version>
    <log4j.version>1.2.17</log4j.version>
    <lombok.version>1.16.18</lombok.version>
    <mysql.version>8.0.18</mysql.version>
    <druid.version>1.1.16</druid.version>
    <druid.spring.boot.starter.version>1.1.10</druid.spring.boot.starter.version>
    <spring.boot.version>2.2.2.RELEASE</spring.boot.version>
    <spring.cloud.version>Hoxton.SR1</spring.cloud.version>
    <spring.cloud.alibaba.version>2.1.0.RELEASE</spring.cloud.alibaba.version>
    <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
    <mybatis-spring-boot-starter.version>2.1.1</mybatis-spring-boot-starter.version>
    <hutool-all.version>5.1.0</hutool-all.version>
  </properties>

  <distributionManagement>
    <site>
      <id>website</id>
      <url>scp://webhost.company.com/www/website</url>
    </site>
  </distributionManagement>

  <!-- 子模块继承之后，提供作用：锁定版本 + 子module不用谢groupId和version -->
  <dependencyManagement>
    <dependencies>
      <!--spring boot 2.2.2-->
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>2.2.2.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <!--spring cloud Hoxton.SR1-->
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Hoxton.SR1</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <!--Spring cloud alibaba 2.1.0.RELEASE-->
      <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-alibaba-dependencies</artifactId>
        <version>2.1.0.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${ 
   mysql.version}</version>
      </dependency>
      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>${ 
   druid.version}</version>
      </dependency>
      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>${ 
   druid.spring.boot.starter.version}</version>
      </dependency>
      <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>${ 
   mybatis-spring-boot-starter.version}</version>
      </dependency>
      <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>${ 
   lombok.version}</version>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <version>2.2.2.RELEASE</version>
        <configuration>
          <fork>true</fork>
          <addResources>true</addResources>
        </configuration>
      </plugin>
    </plugins>
  </build>


</project>

新建第一台eureka
pom依赖三台都一样只写这一个

<dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${ 
   project.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>
    </dependencies>

写完pom文件后需要新建一个yml文件内容如下

server:
  port: 7001

eureka:
  instance:
    hostname:  eureka7001.com #eureka服务端的实例名称
  client:
    # false表示不向注册中心注册自己
    register-with-eureka: false
    # false表示自己端就是注册中心,我的职责就是维护服务实例,并不需要检索服务
    fetch-registry: false
    service-url:
      # 设置与Eureka Server交互的地址查询服务和注册服务都需要依赖这个地址
      # 单机 defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

      # 相互注册集群
      #defaultZone: http://eureka7002.com:7002/eureka/
      defaultZone: 
      http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/  #体现你中有我
      
  server:
    #关闭自我保护模式，保证不可用服务被及时删除
    enable-self-preservation: false
    eviction-interval-timer-in-ms: 2000

最后新建一个启动类即可

@SpringBootApplication
@EnableEurekaServer
public class EurekaMain7001 { 
   
    public static void main(String[] args) { 
   
        SpringApplication.run(EurekaMain7001.class,args);
    }
}

启动项目后输入http://eureka7001.com:7001/就能够看到其余两台被注册进7001中
在这里插入图片描述
这里说明以下eureka7001.com，eureka7002.com，eureka7003.com这些是我修改hosts文件才存在的为了区分eureka

第二台，第三台除了yml文件和启动类不同其余都相同，这里我只将第二台第三台的yml文件贴出来，其余自己根据上面的步骤自己新建，举一反三。
第二台yml

server:
  port: 7002

eureka:
  instance:
    hostname: eureka7002.com #eureka服务端的实例名称
  client:
    # false表示不向注册中心注册自己
    register-with-eureka: false
    # false表示自己端就是注册中心,我的职责就是维护服务实例,并不需要检索服务
    fetch-registry: false
    service-url:
      # 设置与Eureka Server交互的地址查询服务和注册服务都需要依赖这个地址
      # 单机 defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
      # 相互注册
      #defaultZone: http://eureka7001.com:7001/eureka/
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7003.com:7003/eureka/
  server:
    #关闭自我保护模式，保证不可用服务被及时删除
    enable-self-preservation: false
    eviction-interval-timer-in-ms: 2000

第三台yml

server:
  port: 7003

eureka:
  instance:
    hostname:  eureka7003.com #eureka服务端的实例名称
  client:
    # false表示不向注册中心注册自己
    register-with-eureka: false
    # false表示自己端就是注册中心,我的职责就是维护服务实例,并不需要检索服务
    fetch-registry: false
    service-url:
      # 设置与Eureka Server交互的地址查询服务和注册服务都需要依赖这个地址
      # 单机 defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

      # 相互注册集群
      #defaultZone: http://eureka7002.com:7002/eureka/
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
  server:
    #关闭自我保护模式，保证不可用服务被及时删除
    enable-self-preservation: false
    eviction-interval-timer-in-ms: 2000