Rollback strategies in Jenkins - Mini Project: Build & Apply

Implementing a Basic Rollback Strategy in Jenkins Pipeline

📖 Scenario: You are working as a DevOps engineer. Your team uses Jenkins to deploy applications. Sometimes deployments fail, and you need a way to quickly go back to the last working version. This is called a rollback.In this project, you will create a simple Jenkins pipeline script that deploys an application and rolls back if the deployment fails.

🎯 Goal: Build a Jenkins pipeline script that deploys an application, checks if the deployment succeeded, and if not, rolls back to the previous stable version.

📋 What You'll Learn

Create a variable to hold the current application version

Add a variable for the previous stable version

Write a conditional step to check deployment success

Print the deployment or rollback result

💡 Why This Matters

🌍 Real World

Rollback strategies are essential in real deployments to quickly recover from failed releases and keep applications stable.

💼 Career

Understanding rollback in Jenkins pipelines is a key skill for DevOps engineers to maintain reliable continuous delivery.

1

Setup Application Versions

Create two variables in the Jenkins pipeline script: currentVersion set to "1.2.0" and previousVersion set to "1.1.5".

Jenkins

# Your code here

Need a hint?

Use def to declare variables inside the script block.

2

Add Deployment Status Variable

Inside the script block, add a variable called deploymentSuccess and set it to false to simulate a failed deployment.

Jenkins

pipeline {
    agent any
    stages {
        stage('Setup Versions') {
            steps {
                script {
                    def currentVersion = "1.2.0"
                    def previousVersion = "1.1.5"
                    // Your code here
                }
            }
        }
    }
}

Need a hint?

Set deploymentSuccess to false to simulate failure.

3

Add Rollback Logic

Inside the script block, write an if statement that checks deploymentSuccess. If it is false, set a variable deployedVersion to previousVersion. Otherwise, set deployedVersion to currentVersion.

Jenkins

pipeline {
    agent any
    stages {
        stage('Setup Versions') {
            steps {
                script {
                    def currentVersion = "1.2.0"
                    def previousVersion = "1.1.5"
                    def deploymentSuccess = false
                    // Add if statement to set deployedVersion
                }
            }
        }
    }
}

Need a hint?

Use if (!deploymentSuccess) to check if deployment failed.

4

Print Deployment Result

Add a println statement inside the script block to print "Deployed version: " followed by the deployedVersion variable.

Jenkins

pipeline {
    agent any
    stages {
        stage('Setup Versions') {
            steps {
                script {
                    def currentVersion = "1.2.0"
                    def previousVersion = "1.1.5"
                    def deploymentSuccess = false
                    def deployedVersion
                    if (!deploymentSuccess) {
                        deployedVersion = previousVersion
                    } else {
                        deployedVersion = currentVersion
                    }
                    // Print the deployed version
                }
            }
        }
    }
}

Need a hint?

Use println("Deployed version: ${deployedVersion}") to print the result.