微服务之服务链路追踪(Spring Cloud Sleuth)

"Hello SpringBoot, Hello SpringClould"

Posted by 墨城烟柳(Mcyl) on January 15, 2019

“Hello everyone! ”

服务链路追踪(Spring Cloud Sleuth)简介

Spring Cloud Sleuth实现对Spring cloud 分布式链路监控 本文介绍了和Sleuth相关的内容,主要内容如下:

1、Spring Cloud Sleuth中的重要术语和意义:Span、Trance、Annotation 2、Zipkin中图形化展示分布式链接监控数据并说明字段意义 3、Spring Cloud集成Sleuth + Zipkin 的代码demo: Sleuth集成Zipkin, Zipkin数据持久化等

第一步:创建条件

主要有三个工程组成:一个server-zipkin,它的主要作用使用ZipkinServer的功能,收集调用数据, 并展示;一个service-one,对外暴露/hello接口;一个service-two,对外暴露/hello接口; 这两个service可以相互调用;并且只有调用了,server-zipkin才会收集数据的,这就是为什么叫服务追踪了。

第二步:创建server-zipkin工程:

在spring Cloud为Finchley版本的时候,已经不需要自己构建Zipkin Server了,只需要下载jar即可,下载地址:

https://dl.bintray.com/openzipkin/maven/io/zipkin/java/zipkin-server/2.9.4/ 下载zipkin-server-2.9.4-exec.jar

下载完成jar 包之后,需要运行jar,如下:

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java -jar zipkin-server-2.9.4-exec.jar

访问浏览器localhost:9411即可看见管理页面

第三步:创建service-one工程:

右键工程->创建module->选择spring initialir->web->web,cloud tracing->zipkin client,然后一直下一步就行了。

创建完成后:

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<?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>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.2.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.test</groupId>
	<artifactId>service-one</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>service-one</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
		<spring-cloud.version>Greenwich.RC2</spring-cloud.version>
	</properties>

	<dependencies>
		<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>

		<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>

	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
		</repository>
	</repositories>

</project>

配置appication.yml文件:

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server:
  port: 9871
spring:
  zipkin:
	base-url: http://localhost:9411
  application:
	name: service-one

第四步 配置主程序

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import brave.sampler.Sampler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.logging.Level;
import java.util.logging.Logger;

@SpringBootApplication
@RestController
public class ServiceOneApplication {

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

	private static final Logger LOG = Logger.getLogger(ServiceOneApplication.class.getName());

	@Autowired
	private RestTemplate restTemplate;

	@Bean
	public RestTemplate getRestTemplate(){
		return new RestTemplate();
	}

	@RequestMapping("/hello")
	public String callHome(){
		LOG.log(Level.INFO, "calling service-two");
		return restTemplate.getForObject("http://localhost:9872/info/two", String.class);
	}

	@RequestMapping("/info/one")
	public String info(){
		LOG.log(Level.INFO, "calling service-one ");
		return "i'm service-one";
	}

	@Bean
	public Sampler defaultSampler() {
		return Sampler.ALWAYS_SAMPLE;
	}

}

第五步:创建service-two工程:

选择配置包不变,配置端口号改成9872即可

第六步 配置主程序

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import brave.sampler.Sampler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.logging.Level;
import java.util.logging.Logger;

@SpringBootApplication
@RestController
public class ServiceTwoApplication {

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

	private static final Logger LOG = Logger.getLogger(ServiceTwoApplication.class.getName());

	@RequestMapping("/info/two")
	public String home(){
		LOG.log(Level.INFO, "calling service-two");
		return "hi i'm service-two!";
	}

	@RequestMapping("/hello")
	public String info(){
		LOG.log(Level.INFO, "calling service-one");
		return restTemplate.getForObject("http://localhost:9871/info/one",String.class);
	}

	@Autowired
	private RestTemplate restTemplate;

	@Bean
	public RestTemplate getRestTemplate(){
		return new RestTemplate();
	}

	@Bean
	public Sampler defaultSampler() {
		return Sampler.ALWAYS_SAMPLE;
	}

}

第七步 启动程序

启动service-one,service-two

访问:http://localhost:9871/hello,浏览器出现:

i’m service-two

再打开http://localhost:9411/的界面,点击依赖分析,可以发现服务的依赖关系

service-one ——> service-two

同理,访问:http://localhost:9872/hello,浏览器出现:

i’m service-one

这时的依赖关系是

service-one <——> service-two

点击查找调用链,可以看到具体服务相互调用的数据。

源码下载:

https://github.com/mochengyanliu/SpringCloudLearn/tree/master/section9