This time I describe a slightly lighter topic in comparison to some previous posts. Personally, I think Grafana is a very cool tool for visualizing any timeline data. As it turns out it is quite easy to store and visualize Jenkins build results with InfluxDB plugin.

1. Starting docker containers

Let’s begin from starting needed docker containers with Grafana, InfluxDB, and Jenkins.

$ docker run -d --name grafana -p 3000:3000 grafana/grafana
$ docker run -d --name influxdb -p 8086:8086 influxdb
$ docker run -d --name jenkins -p 38080:8080 -p 50000:50000 jenkins

Then you can run client container which links to InfluxDB container. Using this container you can create new database with command CREATE DATABASE grafana.

$ docker run --rm --link=influxdb -it influxdb influx -host influxdb

2. Configuring Jenkins

After starting Jenkins you need to download some plugins. For this sample it should be the following plugins:

• Pipeline Plugin
• Git plugin
• InfluxDB Plugin
• JUnit Plugin
• JaCoCo Plugin

If you are interested in more details about Jenkins configuration and Continuous Delivery take a look on my previous article about that topic How to setup Continuous Delivery environment.

In Manage Jenkins -> Configure System section add new InfluxDB target.

3. Building pipeline in Jenkins

With Jenkins Pipeline Plugin we are building pipelines using Groovy syntax. In the first step (1) we checkout project from GitHub, and then build it with Maven (2). Then we publish JUnit and JaCoCo reports (3) and finally send the whole report to InfluxDB (4).

node {
  def mvnHome
  try {
    stage('Checkout') { //(1)
      git 'https://github.com/piomin/sample-code-for-ci.git'
      mvnHome = tool 'maven3'
    }
    stage('Build') { //(2)
      dir('service-1') {
        sh "'${mvnHome}/bin/mvn' -Dmaven.test.failure.ignore clean package"
      }
    }
    stage('Tests') { //(3)
      junit '**/target/surefire-reports/TEST-*.xml'
      archive 'target/*.jar'
      step([$class: 'JacocoPublisher', execPattern: '**/target/jacoco.exec'])
    }
    stage('Report') { //(4)
      if (currentBuild.currentResult == 'UNSTABLE') {
        currentBuild.result = "UNSTABLE"
      } else {
        currentBuild.result = "SUCCESS"
      }
      step([$class: 'InfluxDbPublisher', customData: null, customDataMap: null, customPrefix: null, target: 'grafana'])
    }
  } catch (Exception e) {
    currentBuild.result = "FAILURE"
    step([$class: 'InfluxDbPublisher', customData: null, customDataMap: null, customPrefix: null, target: 'grafana'])
  }
}

I defined three pipelines for one per every module from the sample.

4. Building services

Add jacoco-maven-plugin Maven plugin to your pom.xml to enable code coverage reporting.

<plugin>
  <groupId>org.jacoco</groupId>
  <artifactId>jacoco-maven-plugin</artifactId>
  <version>0.7.9</version>
  <executions>
    <execution>
      <id>default-prepare-agent</id>
      <goals>
        <goal>prepare-agent</goal>
      </goals>
    </execution>
    <execution>
      <id>default-report</id>
      <phase>prepare-package</phase>
      <goals>
        <goal>report</goal>
      </goals>
    </execution>
  </executions>
</plugin>

Sample application source code is available on GitHub. It consists of three simple modules, which does not do anything important, but only has JUnit tests needed to build results visualization.

5. Configuring Grafana

First, configure the Grafana data source as your InfluxDB Docker container instance.

With InfluxDB Plugin we can report metrics generated by JUnit, Cobertura, JaCoCo, Robot Framework, and Performance Plugin. In the sample application, I’ll show you the reports from JUnit and JaCoCo. Let’s configure our graphs in Grafana. As you can see in the picture below I defined the graph with pipeline Build Time data. The result is grouped by the project name.

Here are two graphs. The first illustrating every pipeline build time data in milliseconds, and second percentage test code coverage. For test coverage we need to select from jacoco_data table instead of jenkins_data and then choose field jacoco_method_coverage_rate.

For more details about visualizing metrics with Grafana and InfluxDB, you can refer to my previous article Custom metrics visualization with Grafana and InfluxDB.