Spring Cloud 配置Eureka Server高可用集群之吊打拦路虎

朱雀 2022-03-26 08:20 217阅读 0赞

## Spring Cloud 配置Eureka Server高可用集群之吊打拦路虎 ##

> 源码地址：[https://download.csdn.net/download/qq\_33624284/10923226][https_download.csdn.net_download_qq_33624284_10923226]

案例：工具采用 idea + 项目结构采用maven多module的结构 + spring boot 版本为 2.1.2

1.  创建空模板Maven项目 eureka  
    pom.xml依赖：

<?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>
    
        <groupId>com.ztw</groupId>
        <artifactId>eureka</artifactId>
        <version>1.0-SNAPSHOT</version>
        
        <packaging>pom</packaging>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.2.RELEASE</version>
            <relativePath/> 
        </parent>
    
        
        <modules>
            <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>Finchley.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>

1.  在eureka下创建module eureka-server，目录结构如下：  
    ![eureka 目录结构][eureka]  
    pom.xml依赖：

<?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>
    
        <groupId>com.ztw</groupId>
        <artifactId>eureka-server</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
        <name>eureka-server</name>
        <description>Demo project for Spring Boot</description>
    
        
        <parent>
            <groupId>com.ztw</groupId>
            <artifactId>eureka</artifactId>
            <version>1.0-SNAPSHOT</version>
        </parent>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <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>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

application.yml配置：

server:
      port: 4001
    eureka:
      instance:
        hostname: localhost
      client:
        ###因为是单个服务，不需要注册
        #fetch-registry: false
        #register-with-eureka: false
        fetch-registry: false
        register-with-eureka: false
        serviceUrl:
          defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

EurekaServerApplication.class:

package com.ztw;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
    
    @SpringBootApplication
    @EnableEurekaServer
    public class EurekaServerApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(EurekaServerApplication.class, args);
        }
    }

[http://localhost:4001/][http_localhost_4001] 圈起来的为空，是因为我们还没有客户注册  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjI0Mjg0_size_16_color_FFFFFF_t_70]  
4. 在eureka下创建module eureka-client，目录结构如下：  
![在这里插入图片描述][20190116113117376.png]  
pom.xml依赖：

<?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>
        <groupId>com.ztw</groupId>
        <artifactId>eureka-client</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
        <name>eureka-client</name>
        <description>Demo project for Spring Boot</description>
    
        
        <parent>
            <groupId>com.ztw</groupId>
            <artifactId>eureka</artifactId>
            <version>1.0-SNAPSHOT</version>
        </parent>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            </dependency>
            <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>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

application.yml配置：

server:
      port: 4002
    eureka:
      instance:
        hostname: localhost
      client:
        ###需要注册
        #fetch-registry: false
        #register-with-eureka: false
        serviceUrl:
          ###服务地址，注册
          defaultZone: http://${eureka.instance.hostname}:4001/eureka/
    spring:
      application:
        name: eureka-client

EurekaClientApplication.class:

package com.ztw;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    
    @SpringBootApplication
    @EnableEurekaClient
    public class EurekaClientApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(EurekaClientApplication.class, args);
        }
    }

[http://localhost:4001/][http_localhost_4001] 圈起来的地方已经有eureka-client 证明注册成功了  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjI0Mjg0_size_16_color_FFFFFF_t_70 1]  
拓展：

eureka:
      instance:
        ###续约心跳时间30秒
        #    lease-renewal-interval-in-seconds: 30
        ###服务剔除时间90秒
        #    lease-expiration-duration-in-seconds: 90
        
        server:
        ###响应缓存30秒，不会立即注册
        #    response-cache-update-interval-ms: 30
        ###Eureka自我保护，
        #Eureka Serve接收到的服务续约低于为该值配置的百分比（默认为 15 分钟 内低于 85% ），
        #则服务器开启自我保护模式，即不再剔除注册列表的信息。
        #    enable-self-preservation: false

1.  配置eureka 高可用集群（两个为例）  
    hosts文件配置：

C:\Windows\System32\drivers\etc
    hosts
    127.0.0.1       peer7
    127.0.0.1       peer8

eureka-server application.yml文件配置：

---
    spring:
      profiles: peer7
    server:
      port: 4007
    eureka:
      instance:
      	###实际应用配服务地址，这里为本地开发环境，已"peer7"参数直观代替
        hostname: peer7
      client:
        ###因为是多个服务集群，需要注册
        #fetch-registry: false
        #register-with-eureka: false
        serviceUrl:
          defaultZone: http://peer8:4008/eureka/
    
    ---
    spring:
      profiles: peer8
    server:
      port: 4008
    eureka:
      instance:
        hostname: peer8
      client:
        serviceUrl:
          defaultZone: http://peer7:4007/eureka/

eureka-client application.yml文件配置：

server:
      port: 4002
    eureka:
      instance:
        hostname: localhost
      client:
        ###需要注册
        #fetch-registry: false
        #register-with-eureka: false
        serviceUrl:
          ###服务地址，向一个服务注册
          defaultZone: http://${eureka.instance.hostname}:4007/eureka/
    spring:
      application:
        name: eureka-client

1.  分别启动对应服务（idea）两次服务启动，需要配置步骤如下：  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjI0Mjg0_size_16_color_FFFFFF_t_70 2]  
    eureka-client 选择main方法启动即可。
2.  验证结果  
    [http://peer7:4007/][http_peer7_4007]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjI0Mjg0_size_16_color_FFFFFF_t_70 3]  
    [http://peer8:4008/][http_peer8_4008]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjI0Mjg0_size_16_color_FFFFFF_t_70 4]

通过访问两个eureka 服务，得到界面的结果来看，都有我们的eureka-client,而我们在client只向peer7:4007/这个服务中注册过，结论明显：两个服务共享了，实现了eureka server集群。

> 以上是详细的eureka 配置过程，（eclipse 的搭建未写，可以自己尝试）搭建项目过程中报错的过程都省略了，对应的解决方法都在上面，可以自己动手配置，一步一步走，遇到问题对照博文修改。

[https_download.csdn.net_download_qq_33624284_10923226]: https://download.csdn.net/download/qq_33624284/10923226
[eureka]: /images/20220326/81c1e3d7a973469f88761412fcc51c51.png
[http_localhost_4001]: http://localhost:4001/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjI0Mjg0_size_16_color_FFFFFF_t_70]: /images/20220326/c827337aa12546859374d206c556b458.png
[20190116113117376.png]: /images/20220326/2df4b2b1c61046e5be1d34d54fbea4c4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjI0Mjg0_size_16_color_FFFFFF_t_70 1]: /images/20220326/e233839a6407463c8aff7853fd447710.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjI0Mjg0_size_16_color_FFFFFF_t_70 2]: /images/20220326/18d5eafb535542c2a6f75424eed26016.png
[http_peer7_4007]: http://peer7:4007/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjI0Mjg0_size_16_color_FFFFFF_t_70 3]: /images/20220326/407cb1695cc2438cae460100c355bb08.png
[http_peer8_4008]: http://peer8:4008/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjI0Mjg0_size_16_color_FFFFFF_t_70 4]: /images/20220326/e74a0d3700f64c748ad92e56a8f99eed.png