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Multibranch Pipeline

Multibranch Pipeline is the standard job type for team-based development. It automatically manages pipelines for all branches and pull requests.

What Is a Multibranch Pipeline?​

A Multibranch Pipeline:

  • Scans a source control repository
  • Detects branches and pull requests
  • Automatically creates a pipeline for each branch
  • Executes Jenkinsfile per branch

This removes the need to create jobs manually.

Why Multibranch Pipelines Are Important​

Without multibranch pipelines:

  • Teams create separate jobs per branch
  • Configuration drift occurs
  • PR validation becomes manual

With multibranch pipelines:

  • CI is automatic
  • Branches are isolated
  • PRs are validated consistently

How Multibranch Pipelines Work​

  1. Jenkins scans SCM repository
  2. Finds branches and PRs
  3. Looks for a Jenkinsfile
  4. Creates jobs dynamically
  5. Executes pipeline per branch

Jenkinsfile Requirement​

Each branch must contain:

Jenkinsfile

Branch-specific logic can be added using conditions.

Typical Use Cases​

  • Feature branch validation
  • Pull request builds
  • Main / develop branch pipelines
  • Team-based CI workflows

Branch-Based Conditions​

when {
  branch 'main'
}

Used for:

  • Deployments
  • Environment-specific steps

Multibranch vs Pipeline Job​

FeaturePipeline JobMultibranch Pipeline
Single branch✅❌
Multiple branches❌✅
PR builds❌✅
Auto discovery❌✅

Common Mistakes​

  • Missing Jenkinsfile in repo
  • Heavy logic inside branch conditions
  • Not cleaning orphaned branches

Production Best Practices​

  • Use multibranch for all team repos
  • Enable periodic branch indexing
  • Clean up old branches automatically
  • Keep Jenkinsfile simple

Interview Perspective​

  • Multibranch pipelines are expected knowledge
  • Explain branch discovery clearly
  • Highlight PR validation