CI/CD pipeline mental model in Jenkins - Mini Project: Build & Apply

CI/CD Pipeline Mental Model with Jenkins

📖 Scenario: You are working as a DevOps engineer. Your team wants to automate the process of building, testing, and deploying a simple application using Jenkins. This will save time and reduce errors by running these steps automatically whenever code changes.

🎯 Goal: Build a simple Jenkins pipeline script that models the CI/CD process with stages for build, test, and deploy. You will create the pipeline steps one by one and finally print the pipeline structure.

📋 What You'll Learn

Create a Jenkins pipeline script with three stages: Build, Test, Deploy

Define a variable for the application name

Use the variable in the pipeline stages

Print the pipeline stages and application name at the end

💡 Why This Matters

🌍 Real World

Automating software build, test, and deployment saves time and reduces human errors in real projects.

💼 Career

Understanding Jenkins pipelines is essential for DevOps roles to implement continuous integration and continuous delivery.

1

Define the application name variable

Create a variable called appName and set it to the string "MyApp".

Jenkins

# Create a variable called appName and set it to "MyApp"
# Your code here

Need a hint?

Use def appName = "MyApp" to create the variable.

2

Create the Jenkins pipeline with stages

Add a pipeline block with an agent any and a stages section containing three stages named Build, Test, and Deploy.

Jenkins

def appName = "MyApp"
// Add a pipeline block with agent any and stages Build, Test, Deploy
# Your code here

Need a hint?

Use pipeline { agent any stages { stage('Build') { steps { ... } } } structure.

3

Use the appName variable inside each stage

Inside each stage's steps, add an echo statement that prints the action and uses the appName variable with ${appName} syntax. For example, in the Build stage, print "Building ${appName}...".

Jenkins

def appName = "MyApp"
pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                // Add echo statement using ${appName}
                # Your code here
            }
        }
        stage('Test') {
            steps {
                // Add echo statement using ${appName}
                # Your code here
            }
        }
        stage('Deploy') {
            steps {
                // Add echo statement using ${appName}
                # Your code here
            }
        }
    }
}

Need a hint?

Use echo "Building ${appName}..." inside the Build stage steps, and similarly for Test and Deploy.

4

Print the pipeline stages and application name

Add a post section with a always block that prints "Pipeline completed for ${appName}" using echo.

Jenkins

def appName = "MyApp"
pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                echo "Building ${appName}..."
            }
        }
        stage('Test') {
            steps {
                echo "Testing ${appName}..."
            }
        }
        stage('Deploy') {
            steps {
                echo "Deploying ${appName}..."
            }
        }
    }
    // Add a post always block to print completion message
    # Your code here
}

Need a hint?

Use post { always { echo "Pipeline completed for ${appName}" } } after the stages block.