1.概述

为什么会出现这个技术？需要解决哪些问题？是什么

• https://github.com/spring-cloud/spring-cloud-sleuth
• Spring Cloud Sleuth提供了一套完整的服务跟踪的解决方案
• 在分布式系统中提供追踪解决方案并且兼容支持了zipkin

解决

2.搭建链路监控步骤

zipkin

下载

SpringCloud从F版起已不需要自己构建Zipkin server了，只需要调用jar包即可https://dl.bintray.com/openzipkin/maven/io/zipkin/java/zipkin-server/ zipkin-server-2.12.9.exec.jar启动jar

java -jar zipkin-server-2.12.9-exec.jar

运行控制台

http://localhost:9411/zipkin/
完整的调用链路上图what
名词解释

• Trace:类似于树结构的Span集合，表示一条调用链路，存在唯一标识
• span:表示调用链路来源，通俗的理解span就是一次请求信息

服务提供者

改造cloud-provider-payment8001pom

<!--包含了sleuth+zipkin-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>

yml

server:
  port: 8001

spring:
  application:
    name: cloud-payment-service
  zipkin:  #zipkin的配置
    base-url: http://localhost:9411 #注册到sleuth的服务端地址
    sleuth:
      sampler:
      probability: 1
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: org.gjt.mm.mysql.Driver
    url: jdbc:mysql://localhost:3306/springcloud2020?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: 123456

mybatis:
  mapperLocations: classpath:mapper/*/*.xml
  type-aliases-package: com.chl.springcloud.entity
#eureka
eureka:
  client:
    register-with-eureka: true #注册中心注册自己
    fetchRegistry: true   #去服务中心拉去服务列表需要去检索服务
    service-url:
      #单机版的注册 eureka的服务中心注册地址
      defaultZone: http://eureka7001.com:7001/eureka

修改业务类PaymentController

/**
     * 测试sleuth的链路追踪
     * @return
     */
    @GetMapping("/payment/zipkin")
    public String paymentZipkin() {
        return "hi ,i'am paymentzipkin server fall back，welcome to atguigu，O(∩_∩)O哈哈~";
    }

服务消费者（调用方）

修改cloud-consumer-order80pom

<!--包含了sleuth+zipkin-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>

yml

server:
  port: 80

spring:
  application:
    name: cloud-order-service
  zipkin:
    base-url: http://localhost:9411 #注册到sleuth的服务端地址
    sleuth:
      sampler:
      probability: 1

eureka:
  client:
    register-with-eureka: true
    fetchRegistry: true
    service-url:
      defaultZone: http://localhost:7001/eureka

修改业务类OrderController

//测试sleuth链路追踪
    // ====================> zipkin+sleuth
    @GetMapping("/consumer/payment/zipkin")
    public String paymentZipkin() {
        String result = restTemplate.getForObject("http://localhost:8001"+"/payment/zipkin/", String.class);
        return result;
    }

测试

依次启动eureka7001/8001/8080调用8001几次测试下
打开浏览器访问   http://localhost:9411 会出现以下界面

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