SpringCloud系列教材 (九)- 服务链路追踪

 

步骤1:什么是服务链路
步骤2:先运行,看到效果,再学习
步骤3:模仿和排错
步骤4:改造
步骤5:pom.xml
步骤6:配置信息
步骤7:sampler

步骤 1 : 什么是服务链路

在前面的例子里,我们有两个微服务,分别是数据服务和视图服务,随着业务的增加,就会有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,所以就需要通过 zipkin 服务链路追踪服务器 这个东西来用图片进行识别了。

步骤 2 : 先运行,看到效果,再学习

老规矩,先下载下载区(点击进入)的可运行项目,配置运行起来,确认可用之后,再学习做了哪些步骤以达到这样的效果。 

1. 需要启动链路追踪服务器,这个启动办法是下载右上角的 zipkin-server-2.10.1-exec.jar, 然后用如下命令启动:

java -jar zipkin-server-2.10.1-exec.jar


2. 挨个启动 eureka-server, 改造后的 product-data-service 和 product-view-service-feign 。 ( product-view-service-ribbon 后续不再使用,所以既没有被改造,也不用再启动了)
3. 访问一次 http://127.0.0.1:8012/products 通过 视图微服务去访问数据微服务,这样链路追踪服务器才知道有这事儿发生~
4. 然后打开链路追踪服务器 http://localhost:9411/zipkin/dependency/ 就可以看到如图所示的 视图微服务调用数据微服务 的图形了。

先运行,看到效果,再学习

步骤 3 : 模仿和排错

在确保可运行项目能够正确无误地运行之后,再严格照着教程的步骤,对代码模仿一遍。 
模仿过程难免代码有出入,导致无法得到期望的运行结果,此时此刻通过比较正确答案 ( 可运行项目 ) 和自己的代码,来定位问题所在。 
采用这种方式,学习有效果,排错有效率,可以较为明显地提升学习速度,跨过学习路上的各个槛。 

推荐使用diffmerge软件,进行文件夹比较。把你自己做的项目文件夹,和我的可运行项目文件夹进行比较。 
这个软件很牛逼的,可以知道文件夹里哪两个文件不对,并且很明显地标记出来 
这里提供了绿色安装和使用教程:diffmerge 下载和使用教程

步骤 4 : 改造

eureka-server 不需要做改造。
product-data-service和product-view-service 需要进行改造以使其可以被追踪到。

步骤 5 : pom.xml

两个 pom.xml 里都增加 zipkin 的jar包。

<dependency>

    <groupId>org.springframework.cloud</groupId>

    <artifactId>spring-cloud-starter-zipkin</artifactId>

</dependency>     

<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>

  <parent>

    <groupId>cn.how2j.springcloud</groupId>

    <artifactId>springcloud</artifactId>

    <version>0.0.1-SNAPSHOT</version>

  </parent>

  <artifactId>product-data-service</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.cloud</groupId>

            <artifactId>spring-cloud-starter-zipkin</artifactId>

        </dependency>       

                         

    </dependencies>

       

</project>

<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>

  <parent>

    <groupId>cn.how2j.springcloud</groupId>

    <artifactId>springcloud</artifactId>

    <version>0.0.1-SNAPSHOT</version>

  </parent>

  <artifactId>product-view-service-feign</artifactId>

   

    <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-openfeign</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-thymeleaf</artifactId>

      </dependency>

 

    <dependency>

        <groupId>org.springframework.cloud</groupId>

        <artifactId>spring-cloud-starter-zipkin</artifactId>

    </dependency>       

                 

    </dependencies>  

   

</project>

步骤 6 : 配置信息

两个的配置文件都加上

spring:

  zipkin:

    base-url: http://localhost:9411

#   server:

#   port: 因为会启动多个 product-data-service, 所以端口号由用户自动设置,推荐 8001,8002,8003

 

spring:

  application:

    name: product-data-service

  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: product-view-service-feign

  zipkin:

    base-url: http://localhost:9411    

  thymeleaf:

    cache: false

    prefix: classpath:/templates/

    suffix: .html

    encoding: UTF-8

    content-type: text/html

    mode: HTML5    

步骤 7 : sampler

在启动类里配置 Sampler 抽样策略: ALWAYS_SAMPLE 表示持续抽样

@Bean

public Sampler defaultSampler() {

    return Sampler.ALWAYS_SAMPLE;

}  

package cn.how2j.springcloud;

 

import java.util.Scanner;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.Future;

import java.util.concurrent.TimeUnit;

import java.util.concurrent.TimeoutException;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.builder.SpringApplicationBuilder;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

import org.springframework.context.annotation.Bean;

 

import brave.sampler.Sampler;

import cn.hutool.core.convert.Convert;

import cn.hutool.core.thread.ThreadUtil;

import cn.hutool.core.util.NetUtil;

import cn.hutool.core.util.NumberUtil;

 

@SpringBootApplication

@EnableEurekaClient

public class ProductDataServiceApplication {

    public static void main(String[] args) {

        int port = 0;

        int defaultPort = 8001;

        Future<Integer> future = ThreadUtil.execAsync(() ->{

                int p = 0;

                System.out.println("请于5秒钟内输入端口号, 推荐  8001 、 8002  或者  8003,超过5秒将默认使用 " + defaultPort);

                Scanner scanner = new Scanner(System.in);

                while(true) {

                    String strPort = scanner.nextLine(); 

                    if(!NumberUtil.isInteger(strPort)) {

                        System.err.println("只能是数字");

                        continue;

                    }

                    else {

                        p = Convert.toInt(strPort);

                        scanner.close();

                        break;

                    }

                }

                return p;

        });

        try{

            port=future.get(5,TimeUnit.SECONDS);

        }

        catch (InterruptedException | ExecutionException | TimeoutException e){

            port = defaultPort;

        }

         

        if(!NetUtil.isUsableLocalPort(port)) {

            System.err.printf("端口%d被占用了,无法启动%n", port );

            System.exit(1);

        }

         

        newSpringApplicationBuilder(ProductDataServiceApplication.class).properties("server.port=" + port).run(args);

    }

    @Bean

    public Sampler defaultSampler() {

        return Sampler.ALWAYS_SAMPLE;

    }    

}

package cn.how2j.springcloud;

 

import java.util.Scanner;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.Future;

import java.util.concurrent.TimeUnit;

import java.util.concurrent.TimeoutException;

 

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.builder.SpringApplicationBuilder;

import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

import org.springframework.cloud.openfeign.EnableFeignClients;

import org.springframework.context.annotation.Bean;

 

import brave.sampler.Sampler;

import cn.hutool.core.convert.Convert;

import cn.hutool.core.thread.ThreadUtil;

import cn.hutool.core.util.NetUtil;

import cn.hutool.core.util.NumberUtil;

 

@SpringBootApplication

@EnableEurekaClient

@EnableDiscoveryClient

@EnableFeignClients

public class ProductViewServiceFeignApplication {

 

    public static void main(String[] args) {

        int port = 0;

        int defaultPort = 8012;

        Future<Integer> future = ThreadUtil.execAsync(() ->{

                int p = 0;

                System.out.println("请于5秒钟内输入端口号, 推荐  8012 、 8013  或者  8014,超过5秒将默认使用"+defaultPort);

                Scanner scanner = new Scanner(System.in);

                while(true) {

                    String strPort = scanner.nextLine(); 

                    if(!NumberUtil.isInteger(strPort)) {

                        System.err.println("只能是数字");

                        continue;

                    }

                    else {

                        p = Convert.toInt(strPort);

                        scanner.close();

                        break;

                    }

                }

                return p;

        });

        try{

            port=future.get(5,TimeUnit.SECONDS);

        }

        catch (InterruptedException | ExecutionException | TimeoutException e){

            port = defaultPort;

        }

        if(!NetUtil.isUsableLocalPort(port)) {

            System.err.printf("端口%d被占用了,无法启动%n", port );

            System.exit(1);

        }

        newSpringApplicationBuilder(ProductViewServiceFeignApplication.class).properties("server.port="+ port).run(args);

 

    }

    @Bean

    public Sampler defaultSampler() {

        return Sampler.ALWAYS_SAMPLE;

    }

     

}


更多内容,点击了解: https://how2j.cn/k/springcloud/springcloud-zipkin/2052.html

posted @ 2020-06-04 09:54  Lan_ht2  阅读(329)  评论(0编辑  收藏  举报