Twelve-Factor App

Twelve-Factor App is a methodology and a set of best practices to build SaaS applications.

1. Codebase – One codebase tracked in revision control, many deploys
2. Dependencies – Explicitly declare and isolate dependencies
3. Config – Store config in the environment
4. Backing services – Treat backing services as attached resources
5. Build, release, run – Strictly separate build and run stages
6. Processes – Execute the app as one or more stateless processes
7. Port binding – Export services via port binding
8. Concurrency – Scale out via the process model
9. Disposability – Maximize robustness with fast startup and graceful shutdown
10. Dev/prod parity – Keep development, staging, and production as similar as possible
11. Logs – Treat logs as event streams
12. Admin processes – Run admin/management tasks as one-off processes

Resources

• 12factor.net – Twelve-Factor App website