Eureka 集群——Eureka的使用（二）

2018-12-24  本文已影响7人  chuan_bai

一.构建三个节点的Eureka Server集群

---
server:
  port: 8771
spring:
  profiles: server1
  application:
    name: eurekaCluster
eureka:
  instance:
    hostname: server1
  client:
    service-url:
      defaultZone: http://server2:8772/eureka/,http://server3:8773/eureka/
    fetch-registry: true
---
server:
  port: 8772
spring:
  profiles: server2
  application:
    name: eurekaCluster
eureka:
  instance:
    hostname: server2
  client:
    service-url:
      defaultZone: http://server1:8771/eureka/,http://server3:8773/eureka/
    fetch-registry: true

---
server:
  port: 8773
spring:
  profiles: server3
  application:
    name: eurekaCluster
eureka:
  instance:
    hostname: server3
  client:
    service-url:
      defaultZone: http://server1:8771/eureka/,http://server2:8772/eureka/
    fetch-registry: true



<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>eureka-server-cluster</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eureka-server-cluster</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>


    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web-services</artifactId>
        </dependency>
        <!--提供springMvc支持-->
        <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>

        <!--eureka-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
            <version>1.3.4.RELEASE</version>
        </dependency>

    </dependencies>
    <!--引入spring cloud依赖-->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

以mac为例子，编辑 hosts文件,分别 配置 server1,server2,server3 模拟三个服务器

vim sudo /etc/hosts

hosts配置

配置完后可以输入命令测试

ping server1

分别以三种配置启动三个启动项

键入命令

java -jar eureka-server-cluster-0.0.1-SNAPSHOT.jar --spring.profiles.active=server1

java -jar eureka-server-cluster-0.0.1-SNAPSHOT.jar --spring.profiles.active=server2

java -jar eureka-server-cluster-0.0.1-SNAPSHOT.jar --spring.profiles.active=server3

如果是IDEA可以直接配置启动参数


image.png

\color{red}{注意：}

启动前两个注册中心时会报Cannot execute request on any known server的错误，但是当三个启动项全都启动起来以后，报错就会消失

image.png

二.注册到Eureka Server集群上

server:
  port: 9092
spring:
  application:
    name: eureka-client
eureka:
  instance:
    hostname: localhost
    # 使用IP注册
    preferIpAddress: true
    # 心跳间隔
    lease-renewal-interval-in-seconds: 3
    # 服务失效时间： 如果多久没有收到请求，则可以删除服务
    lease-expiration-duration-in-seconds: 7
  client:
    # 关闭eureka client
    # enabled: false
    # 注册自身到eureka服务器
    register-with-eureka: true
    # 表示是否从eureka服务器获取注册信息
    fetch-registry: false
    # 客户端从Eureka Server集群里更新Eureka Server信息的频率
    eureka-service-url-poll-interval-seconds: 60
    # 定义从注册中心获取注册服务的信息
    registry-fetch-interval-seconds: 5
    # 设置eureka服务器所在的地址，查询服务和注册服务都需要依赖这个地址
    service-url:
#      defaultZone: http://${eureka.instance.hostname}:8761/eureka/
      defaultZone: http://server1:8771/eureka/,http://server2:8772/eureka/,http://server3:8773/eureka/


package com.basil;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class EurekaClientApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaClientApplication.class, args);
    }
}


<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>eureka-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eureka-client</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>


    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web-services</artifactId>
        </dependency>
        <!--提供springMvc支持-->
        <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>

        <!--eureka-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
            <version>1.3.4.RELEASE</version>
        </dependency>

        <!--<dependency>-->
            <!--<groupId>org.springframework.cloud</groupId>-->
            <!--<artifactId>spring-cloud-starter</artifactId>-->
        <!--</dependency>-->


    </dependencies>
    <!--引入spring cloud依赖-->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

成功启动后

image.png
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