Summary  
This chapter explains how to define a declarative Jenkins pipeline in a Jenkinsfile, using agents, stages, and steps (shell commands printing messages) to automate build, test, and deployment processes.

General domain of usage  
Continuous integration and continuous deployment (CI/CD) 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?

Learn the fundamentals of DevOps and how it streamlines software development. By the end, you'll understand key principles, automation, and version control to set up a basic DevOps workflow. 


Explore the core concepts of DevOps and its impact on modern development. By the end, you will learn about CI/CD, Git version control, and automation to build a strong foundation for DevOps practices. 


Dive deeper into CI/CD fundamentals, Jenkins for automation, Docker & Kubernetes for containerized deployment, and GitHub Actions for workflow automation. By the end, you will have a fully automated CI/CD pipeline that integrates development, testing, and deployment seamlessly. 

You’ll put core DevOps practices into action using Infrastructure as Code (IaC) tools like Terraform and Ansible. Each task is designed to help you automate real-world infrastructure setups, making your systems faster to deploy, easier to manage, and ready for growth.

Learn how to track system health and performance, set up alerts, and use logs for deeper insights. The section covers monitoring tools and logging practices to ensure application reliability.

Automate Build & Testing Processes

Create a Jenkinsfile

Troubleshooting Common Issues

Awesome!

Automate Build & Testing Processes

Create a Jenkinsfile

Troubleshooting Common Issues