Exercise-8

8. Practical Exercise: Set Up a Jenkins CI Pipeline for a Maven Project, Use Ansible to Deploy Artifacts Generated by Jenkins.

🔧 Part 1: Install Jenkins and Maven on Ubuntu (VirtualBox)

Step 1: Update System

sudo apt update
sudo apt upgrade -y

Step 2: Install Java (required for Jenkins & Maven)

sudo apt install openjdk-17-jdk -y
java -version

Step 3: Install Maven

sudo apt install maven -y
mvn -version

Step 4: Install Jenkins

Add Jenkins Repository

wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -
sudo sh -c 'echo deb https://pkg.jenkins.io/debian binary/ > /etc/apt/sources.list.d/jenkins.list'

Install Jenkins

sudo apt update
sudo apt install jenkins -y

Start and Enable Jenkins

sudo systemctl start jenkins
sudo systemctl enable jenkins

Access Jenkins

Open browser inside Ubuntu and go to:

http://localhost:8080

Unlock Jenkins

sudo cat /var/lib/jenkins/secrets/initialAdminPassword

Use this password to unlock Jenkins and install Suggested Plugins.

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✨ Part 2: Create a Simple "Hello World" Java Maven Project

Step 1: Create Directory and Project

mkdir hello-maven
cd hello-maven
mvn archetype:generate -DgroupId=com.example -DartifactId=hello-maven -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

Step 2: Navigate to the Project

cd hello-maven

Step 3: 

Edit the App.java

// File: src/main/java/com/example/App.java
package com.example;

public class App {
    public static void main(String[] args) {
        System.out.println("Hello, Jenkins CI!");
    }
}

Edit pom.xml
<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.example</groupId>
    <artifactId>hello-maven</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>

    <dependencies>
        <!-- JUnit 4 for testing -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <!-- Compiler plugin -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <encoding>UTF-8</encoding>
                    <source>11</source>
                    <target>11</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>
Edit AppTest.java
// File: src/test/java/com/example/AppTest.java
package com.example;

import org.junit.Test;
import static org.junit.Assert.*;

public class AppTest {
    @Test
    public void testApp() {
        assertTrue(true);
    }
}

Step 4: Build and Test

mvn clean install

Output will be in:

target/hello-maven-1.0-SNAPSHOT.jar

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🚀 Part 3: Set Up Jenkins CI Pipeline for the Maven Project

Step 1: Open Jenkins → Create New Job

• Choose Freestyle project

• Name: hello-maven-ci

Step 2: Configure Project

• Source Code Management: None (since local project)

• Build:

  • Add a build step: Invoke top-level Maven targets

  • Goals: clean install

  • POM: path-to-your-project/pom.xml (e.g., workspace/hello-maven/hello-maven/pom.xml)

Note: Keep All Jenkins Projects Inside /var/lib/jenkins/workspace/

Ex:

sudo cp -r /home/anil/Desktop/hello-maven /var/lib/jenkins/workspace/

sudo chown -R jenkins:jenkins /var/lib/jenkins/workspace/hello-maven

Step 3: Save and Build

Click Build Now – Jenkins will compile and build the JAR locally.

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⚙️ Part 4: Deploy Artifact Using Ansible

Step 1: Install Ansible

sudo apt install ansible -y

Step 2: Prepare Ansible Playbook

Create a directory:

mkdir ansible-deploy
cd ansible-deploy

Create deploy.yml:

- name: Deploy Maven Artifact Locally
  hosts: localhost
  tasks:
    - name: Copy JAR to /opt/app
      copy:
        src: /home/user/hello-maven/target/hello-maven-1.0-SNAPSHOT.jar
        dest: /opt/app/hello-maven.jar


Note: Change the src path accordings

Step 3: Run the Playbook

sudo mkdir -p /opt/app
ansible-playbook deploy.yml

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