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  • Eureka集群

    Eureka集群搭建

    高可用集群配置

    当注册中心扛不住高并发的时候,这时候 要用集群来扛;

    普通操作

    新建两个stringboot项目

    module  microservice-eureka-server-2002    microservice-eureka-server-2003

    配置

    microservice-eureka-server-2002
    microservice-eureka-server-2003

    pom.xml 依赖:

     1 <?xml version="1.0" encoding="UTF-8"?>
     2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     3          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     4     <modelVersion>4.0.0</modelVersion>
     5     <parent>
     6         <groupId>com.javaqi</groupId>
     7         <artifactId>qimicroservice</artifactId>
     8         <version>1.0-SNAPSHOT</version>
     9     </parent>
    10     <artifactId>microservice-eureka-server-2002</artifactId>
    11 
    12     <properties>
    13         <java.version>1.8</java.version>
    14     </properties>
    15     <dependencies>
    16         <dependency>
    17             <groupId>org.springframework.cloud</groupId>
    18             <artifactId>spring-cloud-starter-eureka-server</artifactId>
    19         </dependency>
    20         <dependency>
    21             <groupId>org.springframework.boot</groupId>
    22             <artifactId>spring-boot-starter-test</artifactId>
    23             <scope>test</scope>
    24         </dependency>
    25         <!--  修改后立即生效,热部署  -->
    26         <dependency>
    27             <groupId>org.springframework</groupId>
    28             <artifactId>springloaded</artifactId>
    29         </dependency>
    30         <dependency>
    31             <groupId>org.springframework.boot</groupId>
    32             <artifactId>spring-boot-devtools</artifactId>
    33         </dependency>
    34 
    35     </dependencies>
    36     <build>
    37         <plugins>
    38             <plugin>
    39                 <groupId>org.springframework.boot</groupId>
    40                 <artifactId>spring-boot-maven-plugin</artifactId>
    41             </plugin>
    42         </plugins>
    43     </build>
    44 </project>

    添加主启动类EurekaServerApplication_2002,EurekaServerApplication_2003注解

    @EnableEurekaServer
    @SpringBootApplication

    3、前面单机的时候 eureka注册中心实例名称 是localhost,现在是集群,不能三个实例都是localhost,这里复杂的办法是搞三个虚拟机,麻烦,这里有简单办法,直接配置本机hosts,来实现本机域名映射;

    找到 C:WindowsSystem32driversetc  打开hosts,加配置 

    修改application.yml文件,主要是修改 hostname和defaultZone,

    2001

     1 server:
     2   port: 2001
     3   context-path: /
     4 
     5 eureka:
     6   instance:
     7     # 单机 hostname: localhost #eureka注册中心实例名称
     8     hostname: eureka2001.javaqi.com # 集群
     9   client:
    10     register-with-eureka: false     #false 由于该应用为注册中心,所以设置为false,代表不向注册中心注册自己。
    11     service-url:
    12       defaultZone: http://eureka2002.javaqi.com:2002/eureka/,http://eureka2003.javaqi.com:2003/eureka/ # 集群
    13       #单机defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/       #设置与Eureka注册中心交互的地址,查询服务和注册服务用到

    2002

     1 server:
     2   port: 2002
     3   context-path: /
     4 eureka:
     5   instance:
     6     # 单机 hostname: localhost #eureka注册中心实例名称
     7     hostname: eureka2002.javaqi.com # 集群
     8   client:
     9     register-with-eureka: false     #false 由于该应用为注册中心,所以设置为false,代表不向注册中心注册自己。
    10     service-url:
    11       defaultZone: http://eureka2001.javaqi.com:2001/eureka/,http://eureka2003.javaqi.com:2003/eureka/ # 集群
    12       #单机defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/       #设置与Eureka注册中心交互的地址,查询服务和注册服务用到

    2003

     1 server:
     2   port: 2003
     3   context-path: /
     4 eureka:
     5   instance:
     6     # 单机 hostname: localhost #eureka注册中心实例名称
     7     hostname: eureka2003.javaqi.com # 集群
     8   client:
     9     register-with-eureka: false     #false 由于该应用为注册中心,所以设置为false,代表不向注册中心注册自己。
    10     service-url:
    11       defaultZone: http://eureka2001.javaqi.com:2001/eureka/,http://eureka2002.javaqi.com:2002/eureka/ # 集群
    12       #单机defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/       #设置与Eureka注册中心交互的地址,查询服务和注册服务用到

    修改服务提供者项目的application.yml,主要修改eureka.client.service-url.defaultZone

     1 server:
     2   port: 2001
     3   context-path: /
     4 eureka:
     5   instance:
     6     hostname: eureka2001.javaqi.com
     7   client:
     8     register-with-eureka: false
     9     service-url:
    10       defaultZone: http://eureka2002.javaqi.com:2002/eureka/,http://eureka2003.javaqi.com:2003/eureka/ # 集群

    启动三个注册中心,以及服务提供者项目;

    浏览器地址栏访问

     

    骚操作

    删除之前的三个项目

     创建一个microservice-eureka-server(三合一)子工程

    配置pom

     1 <?xml version="1.0" encoding="UTF-8"?>
     2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     3          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     4     <modelVersion>4.0.0</modelVersion>
     5     <parent>
     6         <groupId>com.javaqi</groupId>
     7         <artifactId>qimicroservice</artifactId>
     8         <version>1.0-SNAPSHOT</version>
     9     </parent>
    10     <artifactId>microservice-eureka-server</artifactId>
    11 
    12     <properties>
    13         <java.version>1.8</java.version>
    14     </properties>
    15 
    16     <dependencies>
    17         <dependency>
    18             <groupId>org.springframework.cloud</groupId>
    19             <artifactId>spring-cloud-starter-eureka-server</artifactId>
    20         </dependency>
    21 
    22         <dependency>
    23             <groupId>org.springframework.boot</groupId>
    24             <artifactId>spring-boot-starter-test</artifactId>
    25             <scope>test</scope>
    26         </dependency>
    27 
    28         <!--  修改后立即生效,热部署  -->
    29         <dependency>
    30             <groupId>org.springframework</groupId>
    31             <artifactId>springloaded</artifactId>
    32         </dependency>
    33 
    34         <dependency>
    35             <groupId>org.springframework.boot</groupId>
    36             <artifactId>spring-boot-devtools</artifactId>
    37         </dependency>
    38     </dependencies>
    39 
    40     <build>
    41         <plugins>
    42             <plugin>
    43                 <groupId>org.springframework.boot</groupId>
    44                 <artifactId>spring-boot-maven-plugin</artifactId>
    45             </plugin>
    46         </plugins>
    47     </build>
    48 
    49 
    50 </project>

    Yml文件

     1 ---
     2 server:
     3   port: 2001
     4   context-path: /
     5 eureka:
     6   instance:
     7     hostname: eureka2001.javaqi.com
     8   client:
     9     register-with-eureka: false
    10     service-url:
    11       defaultZone: http://eureka2002.javaqi.com:2002/eureka/,http://eureka2003.javaqi.com:2003/eureka/
    12 spring:
    13   profiles: eureka2001
    14 ---
    15 server:
    16   port: 2002
    17   context-path: /
    18 eureka:
    19   instance:
    20     hostname: eureka2002.javaqi.com
    21   client:
    22     register-with-eureka: false
    23     service-url:
    24       defaultZone: http://eureka2001.javaqi.com:2001/eureka/,http://eureka2003.javaqi.com:2003/eureka/
    25 spring:
    26   profiles: eureka2002
    27 ---
    28 server:
    29   port: 2003
    30   context-path: /
    31 eureka:
    32   instance:
    33     hostname: eureka2003.javaqi.com
    34   client:
    35     register-with-eureka: false
    36     service-url:
    37       defaultZone: http://eureka2001.javaqi.com:2001/eureka/,http://eureka2002.javaqi.com:2002/eureka/
    38 spring:
    39   profiles: eureka2003

    启动类MicroserviceEurekaServerApplication.java

     1 package com.javaqi.microserviceeurekaserver;
     2 
     3 import org.springframework.boot.SpringApplication;
     4 import org.springframework.boot.autoconfigure.SpringBootApplication;
     5 import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
     6 
     7 @EnableEurekaServer
     8 @SpringBootApplication
     9 public class MicroserviceEurekaServerApplication {
    10 
    11     public static void main(String[] args) {
    12         SpringApplication.run(MicroserviceEurekaServerApplication.class, args);
    13     }
    14 
    15 }

    配置

     效果跟普通操作的效果是一致的

    Eureka自我保护机制

    开发环境,我们经常会遇到这个红色的警告;

    当我们长时间为访问服务以及变更服务实例名称的时候,就会出现这个红色警告;

    默认情况,如果服务注册中心再一段时间内没有接收到某个微服务实例的心跳,服务注册中心会注销该实例(默认90秒)。

    由于正式环境,经常会有网络故障,网络延迟问题发生,服务和注册中心无法正常通信,此时服务是正常的,不应该注销该服务,Eureka这时候,就通过“自我保护模式”来解决问题,当短时间和服务失去通信时,保留服务信息,当恢复网络和通信时候,退出“自我保护模式”;

    通过“自我保护模式”,使Eureka集群更加的健壮和稳定;

     

     

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  • 原文地址:https://www.cnblogs.com/xcn123/p/11994917.html
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