SpringCloud学习（六）：sleuth/zipkin 链路追踪

菜鸟学渣接触spring cloud 系列...

公司也上微服务了，再不学习下就凉了，所以来踩坑吧...

版本：

　　spring-boot: 2.0

　　spring-cloud: Finchley.SR1

已有项目：

　　[eureka-server] # 注册中心 port 8761

　　[eureka-client-one] # 微服务1 port 8501

　　[eureka-client-two] # 微服务2 port 8502

　　[eureka-client-turbine] # 断路监控 port 8503

　　[eureka-client-zuul] # 网关服务 port 8601

能上图绝不BB：

　　sleuth可以列出如图一个请求中微服务的依赖关系，即依次调用顺序

　　以及跟踪每个微服务处理时间及是否出错

　　核心组件在于 Twitter 推出的 zipkin 监控组件

一、sleuth [eureka-client-sleuth]

　　新建微服务 [eureka-client-sleuth]

　　引入依赖 spring-cloud-starter-sleuth、spring-cloud-starter-zipkin、zipkin-server、zipkin-autoconfigure-ui

<?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.renzku</groupId>
    <artifactId>eureka-client-sleuth</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>eureka-client-sleuth</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <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.SR1</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-sleuth</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--1. zipkin 从aliyun的仓库居然下不下来 <url>http://maven.aliyun.com/nexus/content/groups/public/</url>   -->
        <!--2. zipkin-server 依赖包下来了，单名为'zipkin-server'本身没下来，也不报错，'@EnableZipkinServer'使用
                不了。单独新建个空maven项目引用zipkin-server，再回本项目reimport又好了，我靠2个小时啊
        -->
        <dependency>
            <groupId>io.zipkin.java</groupId>
            <artifactId>zipkin-server</artifactId>
            <version>2.11.4</version>
        </dependency>
        <dependency>
            <groupId>io.zipkin.java</groupId>
            <artifactId>zipkin-autoconfigure-ui</artifactId>
            <version>2.11.4</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <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>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

pom.xml

　　配置文件 application.yml

server:
  port: 8602

spring:
  application:
    name: eureka-client-sleuth

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/

# 启动报错 -- 见 https://github.com/openzipkin/zipkin/issues/2043#issuecomment-385932918
management:
  metrics:
    web:
      server:
        auto-time-requests: false

　　启动类 EurekaClientSleuthApplication.java

@SpringBootApplication
@EnableEurekaClient
@EnableZipkinServer  // 启用zipkin-server
public class EurekaClientSleuthApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaClientSleuthApplication.class, args);
    }
}

　　依次启动 [eureka-server]、[eureka-client-one]、[eureka-client-two]、[eureka-client-zuul]、[eureka-sleuth]

　　访问 http://localhost:8602/zipkin/

二、结果

　　访问 http://localhost:8601/client-two/test/home 产生一起请求（请求顺序：request -> clientTwo -> clientOne -> response）

　　点击【Find Traces】按钮，出现请求记录列表

　　点击一条数据，可展示详细请求数据：经过的微服务和耗时

　　另外，点击Dependencies 查看微服务依赖关系

三、坑

　　如果操作正常但点击【Find Traces】就是没数据，F12报错：手贱用QQ浏览器调试--> zipkin前端用来ES6语法，QQ浏览器用的老版chrome核。