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  • Eureka集群搭建

    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;

    提示:部分内容请前往上篇博客查找

    普通操作

    我们再新建两个module  microservice-eureka-server-2002  microservice-eureka-server-2003

    1、pom.xml 把依赖加下;

    microservice-eureka-server-2002

     

     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.yuan</groupId>
     7         <artifactId>t226microservice</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 
    16     <dependencies>
    17         <dependency>
    18             <groupId>org.springframework.cloud</groupId>
    19             <artifactId>spring-cloud-starter-eureka-server</artifactId>
    20         </dependency>
    21         <dependency>
    22             <groupId>org.springframework.boot</groupId>
    23             <artifactId>spring-boot-starter-test</artifactId>
    24             <scope>test</scope>
    25         </dependency>
    26         <!--&lt;!&ndash;  修改后立即生效,热部署  &ndash;&gt;-->
    27         <dependency>
    28             <groupId>org.springframework</groupId>
    29             <artifactId>springloaded</artifactId>
    30         </dependency>
    31         <dependency>
    32             <groupId>org.springframework.boot</groupId>
    33             <artifactId>spring-boot-devtools</artifactId>
    34         </dependency>
    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 
    45 </project>

     

     

    microservice-eureka-server-2003

     

     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.yuan</groupId>
     7         <artifactId>t226microservice</artifactId>
     8         <version>1.0-SNAPSHOT</version>
     9     </parent>
    10     <artifactId>microservice-eureka-server-2003</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         <!--&lt;!&ndash;  修改后立即生效,热部署  &ndash;&gt;-->
    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     </dependencies>
    35     <build>
    36         <plugins>
    37             <plugin>
    38                 <groupId>org.springframework.boot</groupId>
    39                 <artifactId>spring-boot-maven-plugin</artifactId>
    40             </plugin>
    41         </plugins>
    42     </build>
    43 
    44 </project>

     

     

     

    2、2002  2003的主启动类EurekaServerApplication_2002,EurekaServerApplication_2003修改下;

    MicroserviceEurekaServer2002Application

     1 package com.yuan.microserviceeurekaserver2002;
     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 MicroserviceEurekaServer2002Application {
    10 
    11     public static void main(String[] args) {
    12         SpringApplication.run(MicroserviceEurekaServer2002Application.class, args);
    13     }
    14 
    15 }

    MicroserviceEurekaServer2003Application

     1 package com.yuan.microserviceeurekaserver2003;
     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 MicroserviceEurekaServer2003Application {
    10 
    11     public static void main(String[] args) {
    12         SpringApplication.run(MicroserviceEurekaServer2003Application.class, args);
    13     }
    14 
    15 }

    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 

     

    修改配置

     

    127.0.0.1  eureka2001.yuan.com
    127.0.0.1  eureka2002.yuan.com
    127.0.0.1  eureka2003.yuan.com

     

    4、修改三个项目的application.yml文件,主要是修改 hostname和defaultZone,

    2001修改:

     1 server:
     2   port: 2001
     3   context-path: /
     4 eureka:
     5   instance:
     6     # 单机 hostname: localhost #eureka注册中心实例名称
     7     hostname: eureka2001.yuan.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。
    11     service-url:
    12       defaultZone: http://eureka2002.yuan.com:2002/eureka/,http://eureka2003.yuan.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修改:

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

    2003修改:

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

    完了之后一次启动:2001==》2002==》2003==》==》1001==》81

     

    访问eureka2001.yuan.com:2001

     

    访问eureka2002.yuan.com:2002

     

    访问eureka2003.yuan.com:2003

     

    消费端localhost:81/student/list

     

     

     

    “骚操作”

    上面eureka服务搭建,除了yml文件不一样,其他文件都一样,

    那么我们有什么办法能够将多个eureka服务集合到一个工程中去呢?

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

    Pom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.yuan</groupId>
     7         <artifactId>t226microservice</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         <dependency>
    22             <groupId>org.springframework.boot</groupId>
    23             <artifactId>spring-boot-starter-test</artifactId>
    24             <scope>test</scope>
    25         </dependency>
    26         <!--&lt;!&ndash;  修改后立即生效,热部署  &ndash;&gt;-->
    27         <dependency>
    28             <groupId>org.springframework</groupId>
    29             <artifactId>springloaded</artifactId>
    30         </dependency>
    31         <dependency>
    32             <groupId>org.springframework.boot</groupId>
    33             <artifactId>spring-boot-devtools</artifactId>
    34         </dependency>
    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 
    45 </project>

    修改yml文件

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

    修改运行配置

    1、选择Eureka2001ServerApplication,点击最左上角复制按钮然后进行下一步操作==》

    2、将用红线划中的地方修改

             如右边第一处:Eureka2001ServerApplication

       第二处:同样

      第三处:eureka2001

     

     启动顺序:2001》2002》2003》1001》81

     访问结果:  其他所有运行结果同上次是一样的,就不一一演示

     

     

     

    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;

     

    谢谢观看!!!

     

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  • 原文地址:https://www.cnblogs.com/ly-0919/p/11996514.html
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