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  • SpringCloud 周边服务学习

    zipkin 链路追踪

    越来越多的微服务存在,他们之间也会有更加复杂的调用关系。
    这个调用关系,仅仅通过观察代码,会越来越难以识别,就需要通过 zipkin 服务链路追踪服务器 这个东西来用图片进行识别各个服务的调用关系

    1.  启动zipkin-server
      java -jar zipkin-server-2.10.1-exec.jar
    2. pom.xml 为各个服务增加
          <!--zipkin-->
              <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-starter-zipkin</artifactId>
              </dependency>
    3. application.yml 为各个需要追踪的服务增加
      spring:
        application:
          name: index-codes-service
      
      #增加 zipkin 地址
        zipkin:
          base-url: http://localhost:9411
      
      eureka:
        client:
          serviceUrl:
            defaultZone: http://localhost:8761/eureka/
      eureka:
        client:
          serviceUrl:
            defaultZone: http://localhost:8761/eureka/
      spring:
        application:
          name: index-data-service
        zipkin:
          base-url: http://localhost:9411
    4. Application增加 Sampler 的Bean
      @SpringBootApplication
      @EnableEurekaClient
      @EnableCaching
      public class IndexCodesApplication {
          public static void main(String[] args) {
               
          }
      //增加Sampler的Bean
          @Bean
          public Sampler defaultSampler() {
              return Sampler.ALWAYS_SAMPLE;
          }
      }
    5. 链路追踪地址
      http://localhost:9411/zipkin/dependency/

    配置服务器 ConfigServer

    1. 创建子模块index-config-server
    2. pom.xml
      <?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">
          <parent>
              <artifactId>trendParentProject</artifactId>
              <groupId>cn.how2j.trend</groupId>
              <version>0.0.1-SNAPSHOT</version>
          </parent>
          <modelVersion>4.0.0</modelVersion>
       
          <artifactId>index-config-server</artifactId>
       
          <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>
      #spring-cloud-config-server 的依赖
              <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-config-server</artifactId>
              </dependency>
      </dependencies> </project>
    3. 启动类 Application 增加 @EnableConfigServer
      @SpringBootApplication
      @EnableConfigServer
      @EnableDiscoveryClient
      @EnableEurekaClient
      public class IndexConfigServerApplication {
          public static void main(String[] args) {
              new SpringApplicationBuilder(IndexConfigServerApplication.class).properties("server.port=" + port).run(args);
          }
      }
    4. application.yml
      spring:
        application:
          name: index-config-server
        cloud:
          config:
      #label 表示 分支
            label: master
            server:
              git:
      #uri 表示 git 地址:
                uri: https://github.com/how2j/trendConfig/
      #searchPaths 表示目录
                searchPaths: respo
      eureka:
        client:
          serviceUrl:
            defaultZone: http://localhost:8761/eureka/

    5. 更改所需要配置的服务
      pom.xml 添加对spring-cloud-starter-config 的依赖
      <!--config-client-->
              <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-starter-config</artifactId>
              </dependency>

      增加bootstrap.yml 把 eureka 地址信息移动到了 bootstrap.yml 

      bootstrap.yml 和 application.yml 的区别,简单说就是前者先启动,并且一些系统方面的配置需要在 bootstrap.yml 里进行配置

      spring:
        cloud:
          config:
            label: master
            profile: dev
            discovery:
              enabled:  true
      #提供了 serviceId: index-config-server, 这个是配置服务器在 eureka server 里的服务名称,这样就可以定位 config-server了
              serviceId:  index-config-server
      eureka:
        client:
          serviceUrl:
            defaultZone: http://localhost:8761/eureka/
      增加注解 @Value("${version}") 
      @Controller
      public class ViewController {
      #
      增加了个注解来获取版本信息 @Value("${version}") String version; @GetMapping("/") public String view(Model m) throws Exception { m.addAttribute("version", version); return "view"; } }

    rabbitMQ 数据广播

    服务业务逻辑
      

    1. 通过运行FreshConfigUtil类, 以 post 方式访问地址 http://localhost:8041/actuator/bus-refresh,通知 view:8041 刷新配置。
    2. view:8041 告诉 index-config-server 获取新的配置数据
    3. index-config-server 从 git 拿到数据,返回给 view:8041
    4. view:8041 拿到数据不仅自己用了,还发给了 rabbitMQ
    5. rabbitMQ 拿到这个数据广播给其他的,比如 view:8042

    1. 启动RabbitMQ
    2. 为view服务添加pom.xml
      <artifactId>trend-trading-backtest-view</artifactId>
          <dependencies>
      #用于访问路径:/actuator/bus-refresh, 这个地址就用来通知它去更新配置服务器
              <dependency>
                  <groupId>org.springframework.boot</groupId>
                  <artifactId>spring-boot-starter-actuator</artifactId>
              </dependency>
      #多了spring-cloud-starter-bus-amqp 用于支持 rabbitmq
              <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-starter-bus-amqp</artifactId>
              </dependency>
          </dependencies>
       
    3. bootstrap.yml

      spring:
        cloud:
          config:
            label: master
            profile: dev
            discovery:
              enabled:  true
              serviceId:  index-config-server
      #新增 but总线配置
          bus:
            enabled: true
            trace:
              enabled: true
      #新增 rabbitMQ 配置
      rabbitmq:
        host: localhost
        port: 5672
        username: guest
        password: guest
      eureka:
        client:
          serviceUrl:
            defaultZone: http://localhost:8761/eureka/
    4. application.yml

      spring:
        application:
          name: trend-trading-backtest-view
        thymeleaf:
          mode: LEGACYHTML5
          encoding: UTF-8
          content-type: text/html
          cache: false
        zipkin:
          base-url: http://localhost:9411
      #增加management
      #其作用是允许访问:/actuator/bus-refresh
      management:
        endpoints:
          web:
            exposure:
              include: "*"
            cors:
              allowed-origins: "*"
              allowed-methods: "*"
    5. 增加 rabbitMQ 端口判断。5672 是 rabbitMQ 服务器的端口, 15672 是 rabbitMQ 自带的某个web工具的端口

              int rabbitMQPort = 5672;
              if(NetUtil.isUsableLocalPort(rabbitMQPort)) {
                  System.err.printf("检查到端口%d 未启用,判断 rabbitMQ 服务器没有启动,本服务无法使用,故退出%n", rabbitMQPort );
                  System.exit(1);
              }
    6. 为view增加注解 @RefreshScope 表示允许刷新

      import org.springframework.beans.factory.annotation.Value;
      import org.springframework.cloud.context.config.annotation.RefreshScope;
      import org.springframework.stereotype.Controller;
      import org.springframework.ui.Model;
      import org.springframework.web.bind.annotation.GetMapping;
        
      @Controller
      @RefreshScope
      public class ViewController {
          @Value("${version}")
          String version;
          @GetMapping("/")
          public String view(Model m) throws Exception {
              m.addAttribute("version", version);
              return "view";
          }
      }
    7. post访问工具

      import java.util.HashMap;  
      import cn.hutool.http.HttpUtil;  
      public class FreshConfigUtil {  
          public static void main(String[] args) {
              HashMap<String,String> headers =new HashMap<>();
              headers.put("Content-Type", "application/json; charset=utf-8");
              System.out.println("因为要去git获取,还要刷新index-config-server, 会比较卡,所以一般会要好几秒才能完成,请耐心等待");
        
              String result = HttpUtil.createPost("http://localhost:8041/actuator/bus-refresh").addHeaders(headers).execute().body();
              System.out.println("result:"+result);
              System.out.println("refresh 完成");
          }
      }
    8. 对服务链路追踪的影响

      因为视图服务进行了改造,支持了 rabbitMQ, 那么在默认情况下,它的信息就不会进入 Zipkin了。 在Zipkin 里看不到视图服务的资料了。
      为了解决这个问题,在启动 Zipkin 的时候 带一个参数就好了:--zipkin.collector.rabbitmq.addresses=localhost

      现在改成

      java -jar zipkin-server-2.10.1-exec.jar --zipkin.collector.rabbitmq.addresses=localhost
       

    断路器监控 

    1. 新建子模块 index-hystrix-dashboard


    2. pom.xml
      <?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">
          <parent>
              <artifactId>trendParentProject</artifactId>
              <groupId>cn.how2j.trend</groupId>
              <version>0.0.1-SNAPSHOT</version>
          </parent>
          <modelVersion>4.0.0</modelVersion>
       
          <artifactId>index-hystrix-dashboard</artifactId>
       
          <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-actuator</artifactId>
              </dependency>
              <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
              </dependency>
              <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
              </dependency>
       
          </dependencies>
       
      </project>
    3. 断路器监控启动器 IndexHystrixDashboardApplication
      import org.springframework.boot.autoconfigure.SpringBootApplication;
      import org.springframework.boot.builder.SpringApplicationBuilder;
      import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
      import cn.hutool.core.util.NetUtil;
      @SpringBootApplication
      //使用 @EnableHystrixDashboard 来启动断路器监控台 @EnableHystrixDashboard
      public class IndexHystrixDashboardApplication { public static void main(String[] args) { int port = 8070; int eurekaServerPort = 8761; if(NetUtil.isUsableLocalPort(eurekaServerPort)) { System.err.printf("检查到端口%d 未启用,判断 eureka 服务器没有启动,本服务无法使用,故退出%n", eurekaServerPort ); System.exit(1); } if(!NetUtil.isUsableLocalPort(port)) { System.err.printf("端口%d被占用了,无法启动%n", port ); System.exit(1); } new SpringApplicationBuilder(IndexHystrixDashboardApplication.class).properties("server.port=" + port).run(args); } }


    4. application.yml
      spring:
        application:
          name: index-hystrix-dashboard
    5. 对需要进行监控的服务进行修改
      pom.xml 增加监控接口
      <!--监控接口-->
              <dependency>
                  <groupId>org.springframework.boot</groupId>
                  <artifactId>spring-boot-starter-actuator</artifactId>
              </dependency>
    6. 为需要监控的服务的启动类增加注解: @EnableCircuitBreaker,用于把断路信息分享出来
      @EnableCircuitBreaker
      public class TrendTradingBackTestServiceApplication {
          public static void main(String[] args) {
               new SpringApplicationBuilder(TrendTradingBackTestServiceApplication.class).properties("server.port=" + port).run(args);
          }
      }
    7. 更改需要监控的服务的application.yml
      spring:
        application:
          name:  trend-trading-backtest-service
        zipkin:
          base-url: http://localhost:9411
      feign.hystrix.enabled: true
      #增加如下内容,使之可以访问
      management:
        endpoints:
          web:
            exposure:
              include: "*"
            cors:
              allowed-origins: "*"
              allowed-methods: "*"
    8. 监控地址
      http://localhost:8070/hystrix

      输入参数

      http://localhost:8051/actuator/hystrix.stream
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  • 原文地址:https://www.cnblogs.com/ideaAI/p/13830111.html
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