Lesson 12: Jenkins Fundamentals

What is Jenkins?

Jenkins is an open-source automation server used to implement Continuous Integration and Continuous Delivery (CI/CD). It automates building, testing, and deploying applications.

Why Jenkins is Important in DevOps

• Automates repetitive build and test tasks
• Detects issues early in the development cycle
• Improves software quality and release speed
• Integrates with many DevOps tools

Jenkins Architecture

• Jenkins Controller: Manages jobs and scheduling
• Agents (Nodes): Execute build and test tasks
• Plugins: Extend Jenkins functionality

Installing Jenkins (Overview)

# Ubuntu example
sudo apt update
sudo apt install openjdk-11-jdk
sudo apt install jenkins
sudo systemctl start jenkins
sudo systemctl enable jenkins
    

Jenkins Jobs

• Freestyle Jobs
• Pipeline Jobs
• Multibranch Pipelines
• Folder-based Jobs

Plugins and Integrations

• Git and GitHub integration
• Maven, Gradle, and Docker plugins
• Slack and email notifications
• Cloud integrations (AWS, Azure)

Common Jenkins Use Cases

• Automated code builds
• Running unit and integration tests
• Deploying applications
• CI/CD pipeline orchestration

What You Learned

• Jenkins fundamentals and purpose
• Core Jenkins components
• Jobs, plugins, and integrations
• How Jenkins fits into DevOps workflows