The Twelve-Factor App

The Twelve-Factor App

Overview

Twelve best practices for building software-as-a-service apps that are portable and resilient.

Highlights (simplified)

• Codebase: one codebase, tracked in version control
• Dependencies: explicit, isolated
• Config: in environment variables
• Backing services: treat as attached resources
• Build, release, run: separate stages
• Processes: stateless and share-nothing
• Logs: treat as event streams

Checklist

• Keep secrets/config out of code
• Build once, deploy many
• Scale via processes

Resources

• 12factor.net