Jenkins Pipeline Generator

What is a Jenkinsfile?

A Jenkinsfile is a text file that contains the definition of a Jenkins Pipeline and is checked into source control. It allows you to model your deployment pipeline as code (Pipeline-as-Code).

Declarative vs. Scripted Pipeline

Jenkins supports two different syntax paradigms:

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Declarative Pipeline (Recommended)

Declarative Pipeline is a more recent and advanced addition to Jenkins. It provides a more structured, simpler, and highly opinionated syntax. It enforces a strict block structure (e.g., pipeline, agent, stages, steps, post).

Best for: Most standard CI/CD use cases, beginners, and ensuring enterprise standardization.

Validation: Easier to validate and catch errors before execution.

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Scripted Pipeline

Scripted Pipeline is the traditional way to write Jenkinsfiles. It is essentially a full-fledged Groovy script executed inside Jenkins.

Best for: Complex pipelines with dynamic behavior, loops, conditional logic, and heavy use of custom shared libraries.

Structure: Less structured, starts with a node block.

Key Concepts

Agent: Defines where the entire pipeline, or a specific stage, will execute in the Jenkins environment depending on where the agent directive is placed.

Stages/Steps: A stage block defines a conceptually distinct subset of tasks performed through the entire pipeline (e.g. "Build", "Test", "Deploy"). A step is a single task.

Post: The post section defines actions that will run at the end of the pipeline or a stage. Common use cases include sending notifications or cleaning up the workspace.