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Pipeline Flow Control – Overview

This section covers how Jenkins pipelines make decisions and control execution flow. Flow control is essential for real-world CI/CD pipelines, not toy examples.

What Is Pipeline Flow Control?​

Flow control allows pipelines to:

  • Run stages conditionally
  • Accept runtime input
  • Change behavior based on parameters
  • Handle failures gracefully
  • Control time, retries, and concurrency

Without flow control, pipelines are:

  • Rigid
  • Hard to reuse
  • Unsafe for production

Why Flow Control Matters in Production​

Real pipelines must handle:

  • Multiple environments (DEV / QA / PROD)
  • Branch-based logic
  • Feature toggles
  • Manual approvals
  • Failures and retries

Flow control makes pipelines safe and flexible.

Core Flow Control Features​

This section is split into focused documents covering:

  • when conditions (conditional stages)
  • Build parameters
  • input step (manual approvals)
  • options directive
  • Timeouts and retries

Each concept is documented independently.

Typical Real-World Examples​

  • Deploy only from main branch
  • Run regression tests only when flag is enabled
  • Pause pipeline for production approval
  • Automatically retry flaky tests
  • Fail fast on long-running stages

Common Beginner Mistakes​

  • Hardcoding branch logic
  • Skipping approvals in PROD
  • No timeouts (pipelines hang forever)
  • No retries for flaky tests

Interview Perspective​

  • Flow control questions are very common
  • Expect scenarios, not definitions
  • Ability to explain when vs parameters is key