Master-agent architecture in Jenkins - Mini Project: Build & Apply

Master-agent architecture

📖 Scenario: You are setting up a Jenkins environment to automate software builds. Jenkins uses a master-agent architecture where the master controls the build process and agents run the build jobs.In this project, you will create a simple Jenkins pipeline script that defines the master and an agent node to run a build step.

🎯 Goal: Build a Jenkins pipeline script that specifies a master and an agent node, then runs a simple shell command on the agent.

📋 What You'll Learn

Create a Jenkins pipeline with a pipeline block

Define an agent with label linux

Add a stage named Build

Inside the stage, run a shell command echo "Building on agent"

💡 Why This Matters

🌍 Real World

Jenkins pipelines automate software builds and tests by distributing work from the master to multiple agent nodes.

💼 Career

Understanding master-agent architecture is essential for DevOps engineers to set up scalable CI/CD pipelines.

1

Create the pipeline block

Write a Jenkins pipeline script starting with pipeline {} block.

Jenkins

pipeline {
    // Your code here
}

Need a hint?

The pipeline block is the root of your Jenkinsfile script.

2

Add an agent with label linux

Inside the pipeline block, add an agent section with label 'linux' to specify the agent node.

Jenkins

pipeline {
    agent {
        // Your code here
    }
}

Need a hint?

The agent label tells Jenkins which node to run the build on.

3

Add a Build stage with a shell step

Inside the pipeline block, add a stages section with one stage named Build. Inside this stage, add a steps block that runs the shell command echo "Building on agent" using sh.

Jenkins

pipeline {
    agent {
        label 'linux'
    }
    stages {
        stage('Build') {
            steps {
                // Your code here
            }
        }
    }
}

Need a hint?

The sh step runs shell commands on the agent node.

4

Print the pipeline script

Print the entire Jenkins pipeline script you wrote.

Jenkins

// Your code here to print the pipeline script

Need a hint?

Use println to output confirmation text.