Summary
This chapter details how to define a declarative Jenkins pipeline in a Jenkinsfile to implement code that orchestrates build, test, and deploy stages, printing progress messages at each step.

General domain of usage
CI/CD pipeline automation

In this task, you will set up a **Jenkins** pipeline to automate builds and testing. You'll link **Jenkins** to a **GitHub** repository, define a **Jenkinsfile** to script the pipeline, and trigger an automated build process to verify its execution.

## Create a Jenkinsfile

1. Enter **Jenkinsfile** as the filename. Ensure there is no file extension;

2. Copy and paste the following declarative pipeline script into the editor.

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

This **Jenkins** declarative pipeline runs on any agent and follows a straightforward **Build** → **Test** → **Deploy** sequence. Each stage is a placeholder for real commands: building the project and generating artifacts, running tests to ensure quality, and deploying to the target environment. Its simple, modular structure makes it easy to adapt for full **CI/CD** automation in **Jenkins**.



What is the correct stage order in this Jenkinsfile?

A focused, hands-on beginner course guiding you through building, testing, and deploying a demo application with a CI/CD pipeline using Jenkins, Docker, and Kubernetes. Covers pipeline basics, Jenkins setup, Docker integration, basic Kubernetes deployment, and a high-level overview of GitHub Actions as an alternative.

Automate Build & Testing Processes

Create a Jenkinsfile

Troubleshooting Common Issues