3. eureka简单使用和高可用eureka（2刷）

╰+哭是因爲堅強的太久メ 2022-09-07 14:49 108阅读 0赞

# 1. 最简单eureka maven 结构 #

## 父类 modules ##

<?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>2.1.0.RELEASE</version>
    		<relativePath/> 
    	</parent>
    	<groupId>com.forezp</groupId>
    	<artifactId>chapter5-2</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<name>chapter5-2</name>
    	<description>Demo project for Spring Boot</description>
    
    	<modules>
    		<module>eureka-client</module>
    		<module>eureka-server</module>
    	</modules>
    
    	<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>Greenwich.RELEASE</spring-cloud.version>
    	</properties>
    
    	<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>
    
    </project>

## eurekaServer和 client 的pom ##

<modelVersion>4.0.0</modelVersion>
    
    	<parent>
    		<groupId>com.forezp</groupId>
    		<artifactId>chapter5-2</artifactId>
    		<version>0.0.1-SNAPSHOT</version>
    	</parent>
    
    	<groupId>com.forezp</groupId>
    	<artifactId>eureka-server</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    
    	<name>eureka-server</name>
    	<description>Demo project for Spring Boot</description>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.cloud</groupId>
    			<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-actuator</artifactId>
    		</dependency>
    
    	</dependencies>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>

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

# eureka Server #

## application.yaml ##

spring:
      application:
        name: eureka-server
    
    server:
      port: 8761
    
    eureka:
      instance:
        prefer-ip-address: true
        status-page-url-path: /actuator/info #信息查询的url link
        health-check-url-path: /actuator/health #健康检查的url
        hostname: localhost
      # Eureka Server必须禁止向自己注册 必须将eureka.client.register-with-eureka和eureka.client.fetch-registry 设置为false
      client:
        register-with-eureka: false
        fetch-registry: false
        service-url:
          defaultZone: http://${ eureka.instance.hostname}:${ server.port}/eureka/

## 主类上开启eureka ##

@EnableEurekaServer

# eureka Client #

## yaml 和 开启 client ##

spring:
      application:
        name: eureka-client
    
    server:
      port: 8762
    
    eureka:
      client:
        service-url:
          defaultZone: http://localhost:8761/eureka/

@EnableEurekaClient

## controller测试 ##

@RestController
    public class HiController { 
    
        @Value("${server.port}")
        String port;
        
        @GetMapping("/hi")
        public String home(@RequestParam String name) { 
            return "hi "+name+",i am from port:" +port;
        }
    
    }

# eureka Server的其他配置 #

eureka:
      instance:
        lease-expiration-duration-in-seconds: 90 #多长时间没收到心跳，剔除实例时间
        lease-renewal-interval-in-seconds: 30 #发送续约心跳的时间
        
      server:
        enable-self-preservation: true #自我保护模式 开启

*  同理，改变了这些，在测试 模式下，可以更块的 eureka 相关

# 2. 构建高可用的 eureka server集群 #

## 创建两个配置文件，相互注册 ##

*  记得更改主机 hosts

#定义了两个profile 文件，分别为peerl 和peer2 ，它们的hostname 分别为peerl
    #和peer2 。在实际开发中，可能是具体的服务器F 地址，它们的端口分别为8761 和8762
    #因为是在本地搭建Eureka Server 集群，所以需要修改本地的host文件，windows系统的电脑
    #在C:\Windows\System32\drivers\etc\hosts 中修改
    # 127.0.0.1 peer1
    # 127.0.0.1 peer2
    
    ---
    
    spring:
       profiles: peer1
    server:
       port: 8761
    eureka:
      instance:
        hostname: peer1
      client:
        service-url:
          defaultZone: http://peer2:8762/eureka/ # 注意： peer1要连接peer2的eureka地址
      server:
          peer-node-read-timeout-ms: 2000
          
    ---
    
    spring:
       profiles: peer2
    server:
       port: 8762
    eureka:
      instance:
        hostname: peer2
      client:
        service-url:
          defaultZone: http://peer1:8761/eureka/ # 注意： peer2要连接peer1的eureka地址
      server:
        peer-node-read-timeout-ms: 2000

## 启动 ##

java -jar .\eureka-server-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer1

## eureka client 改动 ##

*  随便注册到一个地方即可

spring:
      application:
        name: eureka-client
    
    server:
      port: 8763
    
    eureka:
      client:
        service-url:
          defaultZone: http://localhost:8761/eureka/
          
          //也可以注册两个 ,http://localhost:8762/eureka/