Spring Cloud Zipkin + Sleuth - Distributed tracing system

Hello everyone, today, we will create four different simple microservices (account, product, cart, order) that interact with each other on different ports, then we will Implement distributed tracing using Sleuth and Zipkin. 

What is Sleuth?

Sleuth is used to generate and attach the trace id, and span id to the logs so that these can then be used by tools like Zipkin and ELK for storage and analysis. For more information: Click here 

What is Zipkin?

Zipkin is an open-source distributed system. It helps gather timing data needed to troubleshoot latency problems in service architectures. Features include both the collection and lookup of this data. Zipkin provides the UI interface to analyze the traces and call graph details between services. For more information: Click here 




Step 1: Create Account Service

Project Directory



Spring Boot Dependency Management

<?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 
     https://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>2.6.0</version>
        <relativePath /> 
    </parent>
    <groupId>com.knf.dev.demo</groupId>
    <artifactId>account</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>account</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>2021.0.0-RC1</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-sleuth-zipkin</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-sleuth</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>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>



Rest Controller and Main Driver

package com.knf.dev.demo.account;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
public class AccountServiceApplication {
    private static final Logger LOG = LoggerFactory.
       getLogger(AccountServiceApplication.class);

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

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

    @RestController
    public class AccountController {
        @Autowired
        RestTemplate restTemplate;

        @GetMapping(value = "/account")
        public String account() {
            LOG.info("Inside account service");
            String responseFromProductService = restTemplate.
                   getForObject("http://localhost:9090/product",
                    String.class);
            LOG.info("Successfully communicated " +
               "with product service");
            return responseFromProductService;
        }
    }
}


application.yml

Add application name and server port,
spring:
   application:
      name: account
server:
   port: 9091



Step 2: Create Product Service

Project Directory



Spring Boot Dependency Management

<?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
     https://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>2.6.0</version>
        <relativePath /> 
    </parent>
    <groupId>com.knf.dev.demo</groupId>
    <artifactId>product</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>product</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>2021.0.0-RC1</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-sleuth-zipkin</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-sleuth</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>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>



Rest Controller and Main Driver

package com.knf.dev.demo.product;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
public class ProductServiceApplication {
    private static final Logger LOG = LoggerFactory.
            getLogger(ProductServiceApplication.class);

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

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

    @RestController
    public class ProductController {
        @Autowired
        RestTemplate restTemplate;

        @GetMapping(value = "/product")
        public String product() {
            LOG.info("Inside product service");
            String responseFromCartService = restTemplate.
                    getForObject("http://localhost:9092/cart", 
                            String.class);
            LOG.info("Successfully communicated " + 
                            "with cart service");
            return "Greetings from product" + ">>" + 
                            responseFromCartService;
        }
    }
}


application.yml

Add application name and server port,
spring:
   application:
      name: product
server:
   port: 9090



Step 3: Create Cart Service

Project Directory



Spring Boot Dependency Management

<?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 
     https://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>2.6.0</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.knf.dev.demo</groupId>
    <artifactId>cart</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cart</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>2021.0.0-RC1</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-sleuth-zipkin</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-sleuth</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>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>


Rest Controller and Main Driver

package com.knf.dev.demo.cart;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
public class CartServiceApplication {
    private static final Logger LOG = LoggerFactory.
            getLogger(CartServiceApplication.class);

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

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

    @RestController
    public class CartController {
        @Autowired
        RestTemplate restTemplate;

        @GetMapping(value = "/cart")
        public String cart() {
            LOG.info("Inside cart service");
            String responseFromOrderService = restTemplate.
                    getForObject("http://localhost:9093/order", 
                            String.class);
            LOG.info("Successfully communicated " +
                    "with order service");
            return "Greetings from cart" + ">>" +
                    responseFromOrderService;
        }
    }
}


application.yml

Add application name and server port,
spring:
   application:
      name: cart
server:
   port: 9092



Step 4: Create Order Service

Project Directory



Spring Boot Dependency Management

<?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 
     https://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>2.6.0</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.knf.dev.demo</groupId>
    <artifactId>order</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>order</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>2021.0.0-RC1</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-sleuth-zipkin</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-sleuth</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>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>


Rest Controller and Main Driver

package com.knf.dev.demo.order;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
public class OrderServiceApplication {
    private static final Logger LOG = LoggerFactory.
              getLogger(OrderServiceApplication.class);

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

    @RestController
    public class OrderController {

        @GetMapping(value = "/order")
        public String order() {
            LOG.info("Inside order service");
            return "Greetings from order";
        }
    }
}


application.yml

Add application name and server port,
spring:
   application:
      name: order
server:
   port: 9093



Step 5: Install Zipkin

Download the latest release as a self-contained executable jar.
curl -sSL https://zipkin.io/quickstart.sh | bash -s 
java -jar zipkin.jar

or

The Docker Zipkin project is able to build docker images, provide scripts and a docker-compose.yml for launching pre-built images. The quickest start is to run the latest image directly:
docker run -d -p 9411:9411 openzipkin/zipkin



Step 6: Run Zipkin

java -jar zipkin.jar



Step 7: Start all the 4 applications

Do a final maven build using command mvn clean install in microservices, start all the 4 applications,



Step 8: Verify

Hit this URL in your local system, http://localhost:9091/account


Open a new browser window and hit the URL http://localhost:9411/zipkin

Click on Find Trace. You will see details of four running microservices.



Click on the SHOW button.



Click on the Dependencies button.


Finally, copy the trace Id from the Zipkin dashboard and look into the respective log files to see the log messages.

Download the source code

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