YAML vs Classic Pipelines
Azure DevOps offers two types of pipelines — YAML Pipelines and Classic Pipelines. Each serves the same goal: to automate builds and deployments. However, how they work and how they’re managed can be quite different.
What are YAML Pipelines?
YAML Pipelines are defined using code written in YAML (.yml) files and stored in your source control repository. Think of them as part of your codebase — tracked, reviewed, and versioned just like your application code.
- CI/CD as Code: Pipeline logic is stored alongside application code
- Highly customizable: Use conditions, variables, loops, and templates
- Multi-stage support: Define build, test, and deploy in one file
- Version-controlled: Every change to your pipeline is tracked in Git
Why Choose YAML?
YAML Pipelines are ideal for teams practicing DevOps and Infrastructure as Code (IaC). They offer powerful capabilities for reusability, scalability, and integration with modern workflows.
What are Classic Pipelines?
Classic Pipelines use a graphical user interface (GUI) to build your automation workflows. Instead of writing code, you define your steps through a drag-and-drop visual editor.
- UI-based: Built using the Azure DevOps web portal
- Easy to configure: Great for beginners or simple projects
- Predefined tasks: Add common actions like builds and tests with just a click
- Separate build and release pipelines: More modular in structure
Why Choose Classic?
Classic Pipelines are great when you want to get started quickly without writing YAML. They’re especially helpful for teams with minimal scripting experience or those working on straightforward workflows.
YAML vs Classic: Side-by-Side Comparison
This table outlines the main differences between the two types of pipelines:
| Feature | YAML Pipelines | Classic Pipelines |
|---|---|---|
| Definition Method | Written as code in .yml files | Configured through a web-based GUI |
| Version Control | Fully integrated with Git | Limited (not stored in repo) |
| Flexibility | High – supports conditions, templates, parameters | Moderate – task-driven with limited customization |
| Ease of Use | Requires YAML knowledge and scripting skills | Beginner-friendly and intuitive |
| Ideal Use Cases | Advanced CI/CD, large teams, DevOps automation | Simple builds, learning pipelines, small teams |
How to Choose the Right Pipeline
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Go with YAML Pipelines if:
- You want your CI/CD process in version control
- Your team is familiar with DevOps or scripting
- You need reusable templates, multi-stage flows, or advanced conditions
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Choose Classic Pipelines if:
- You’re just getting started with Azure DevOps
- You prefer visual configuration over writing YAML
- Your project doesn't require complex logic
The good news is — you don’t have to choose forever. You can start with Classic, then migrate to YAML when you’re ready for more control.
Conclusion
Both YAML and Classic Pipelines help you automate builds and deployments. YAML provides advanced control and scalability, while Classic offers simplicity and speed for those getting started. Choose the one that fits your current workflow and grow from there.
Next, we’ll look at how to integrate Azure Repos and GitHub with Azure Pipelines for seamless source-to-deploy automation.