二、spring cloud 注册与发现eureka注册中心

基于2.0 Greenwich高可用eureka注册中心搭建

一、单机版

新建MAVEN父工程demo-parent

删掉src

pom.xml

<packaging>pom</packaging>
    <!--spring boot ⽗启动器依赖-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
    </parent>
​
    <dependencyManagement>
        <dependencies>
            <!--spring cloud依赖管理，引入了Spring Cloud的版本-->
            <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>
            <!--web依赖-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <!--⽇志依赖-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
            </dependency>
            <!--测试依赖-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            <!--lombok⼯具-->
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.4</version>
                <scope>provided</scope>
            </dependency>
            <!-- Actuator可以帮助你监控和管理Spring Boot应⽤-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>
            <!--热部署-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <optional>true</optional>
            </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.cloud</groupId>
                <artifactId>spring-cloud-commons</artifactId>
            </dependency>
        </dependencies>
​
    <build>
        <plugins>
            <!--编译插件-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>11</source>
                    <target>11</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>

单例版eureka注册中心,新建model    demo-eureka-server-8671

pom.xml

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

启动类 添加 @EnableEurekaServer 表示开启Eureka注册中心

package com.wg.edu;
​
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
​
/**
 * @author Mrwg
 * @date 2020/6/20 21:49
 * @desc
 */
@SpringBootApplication
@EnableEurekaServer
public class CloudEurekaServerApplication8761 {
    public static void main(String[] args) {
        SpringApplication.run(CloudEurekaServerApplication8761.class,args);
    }
}
​

application.yml

#eureka server服务端口
server:
  port: 8761
spring:
  application:
    name: cloud-eureka-server # 应用名称，应用名称会在Eureka中作为服务名称
    # eureka 客户端配置（和Server交互），Eureka Server 其实也是一个Client
eureka:
  instance:
    hostname: localhost  # 当前eureka实例的主机名
    prefer-ip-address: true
    instance-id: ${spring.cloud.client.ip-address}:${spring.application.name}:${server.port}
  client:
    service-url:
      # 配置客户端所交互的Eureka Server的地址（Eureka Server集群中每一个Server其实相对于其它Server来说都是Client）
      # 集群模式下，defaultZone应该指向其它Eureka Server，如果有更多其它Server实例，逗号拼接即可
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
    register-with-eureka: false  # 集群模式下可以改成true
    fetch-registry: false # 集群模式下可以改成true

验证

• 执⾏启动类CloudEurekaServerApplication的main函数

• 访问http://127.0.0.1:8761，如果看到如下⻚⾯（Eureka注册中⼼后台），则表明EurekaServer 发布成功

二、高可用注册中心搭建

在现有单机版注册中心上搭建

1、拷贝一份demo-eureka-server-8671 为 demo-eureka-server-8762

2、配置host

127.0.0.1 CloudEurekaServerA
127.0.0.1 CloudEurekaServerB

• 修改项目名称

• pom.xml项目名称，端口

• .iml名称

导入IDEA,检查修改内容

1、修改demo-eureka-server-8671 中的pom.xml

• eureka. instance.hostname= CloudEurekaServerA # 当前eureka实例的主机名

• eureka.client.service-url.defaultZone=http://CloudEurekaServerB:8762/eureka

• eureka.client.register-with-eureka= true # 单机版为false

• eureka.client.fetch-registry= true # 单机版为false

#eureka server服务端口
server:
  port: 8761
spring:
  application:
    name: cloud-eureka-server # 应用名称，应用名称会在Eureka中作为服务名称
    # eureka 客户端配置（和Server交互），Eureka Server 其实也是一个Client
eureka:
  instance:
    hostname: CloudEurekaServerA  # 当前eureka实例的主机名
    prefer-ip-address: true
    instance-id: ${spring.cloud.client.ip-address}:${spring.application.name}:${server.port}
  client:
    service-url:
      # 配置客户端所交互的Eureka Server的地址（Eureka Server集群中每一个Server其实相对于其它Server来说都是Client）
      # 集群模式下，defaultZone应该指向其它Eureka Server，如果有更多其它Server实例，逗号拼接即可
      defaultZone: http://CloudEurekaServerB:8762/eureka
    register-with-eureka: true  # 集群模式下可以改成true
    fetch-registry: true # 集群模式下可以改成true

1、修改demo-eureka-server-8762 中的pom.xml

• eureka. instance.hostname= CloudEurekaServerB # 当前eureka实例的主机名

• eureka.client.service-url.defaultZone=http://CloudEurekaServerA:8761/eureka

• eureka.client.register-with-eureka= true # 单机版为false

• eureka.client.fetch-registry= true # 单机版为false

#eureka server服务端口
server:
  port: 8762
spring:
  application:
    name: cloud-eureka-server # 应用名称，应用名称会在Eureka中作为服务名称
​
    # eureka 客户端配置（和Server交互），Eureka Server 其实也是一个Client
eureka:
  instance:
    hostname: CloudEurekaServerB  # 当前eureka实例的主机名
    prefer-ip-address: true
    instance-id: ${spring.cloud.client.ip-address}:${spring.application.name}:${server.port}
  client:
    service-url: # 配置客户端所交互的Eureka Server的地址
      defaultZone: http://CloudEurekaServerA:8761/eureka
    register-with-eureka: true
    fetch-registry: true

验证，启动demo-eureka-server-8671、demo-eureka-server-8672

访问、cloudeurekaservera:8761 、cloudeurekaservera:8762