Jenkins Tutorial

What is Jenkins? Jenkins is the most widely used open-source automation server. It helps you build, test and deploy software continuously. Whatever your tooling - Maven, Gradle, ...

Install on Ubuntu / Debian Start and Check Open http://localhost:8080 and paste the initial admin password from the file above. First Setup Wizard Install the suggested plugins ...

Create a Freestyle Job A freestyle job is a simple, task-oriented build. It is great for learning because almost everything is click-and-configure. Hello World New Item (Freestyle ...

Why Pipelines? A freestyle job config lives in Jenkins. A Jenkinsfile lives in your repository, so everyone can review and version it. That is the pipeline as code philosophy. A ...

Connect Jenkins to Git In a freestyle job add the source-code step: Repository URL: https://github.com/you/your-app.git Credentials: username/password, SSH key or GitHub app ...

Prerequisites in Jenkins Add a JDK and Maven under Manage Jenkins → Tools . Name them, e.g. JDK21 and Maven3 , and let Jenkins install them automatically or point at your ...

Managing Plugins Plugins extend Jenkins: Git, GitHub, pipeline steps, Slack/email notifications, Docker, Blue Ocean UI, credentials and hundreds more. Manage them under Manage ...

Master versus Agents The master (controller) schedules jobs and serves the UI. Agents do the actual work. Distributing work across agents keeps the controller light and lets you ...

The Workflow Typical CI/CD: build the jar → build an image → push to a registry → deploy. Jenkins has first-class Docker support. Dockerfile in the Repo Build and ...

Access Control Use Matrix-based security or a plugin (Role-based Strategy) with least privilege: separate admin, developer and read-only roles. Force HTTPS behind a reverse proxy ...