12 factor app.md

12 FACTOR APP

1-Codebase :

• Use one codebase in version control, deploying it to different environments.

2-Dependencies :

• Explicitly declare all dependencies, keeping them isolated for consistency.

3-Config :

• Store configurations in environment variables, not in the codebase.

4-Backing Services :

• Treat external services (like databases) as easily replaceable resources.

5-Build, Release, Run :

• Separate building, releasing, and running to ensure controlled deployments.

6-Processes :

• Run the app as stateless processes; use external storage for data.

7-Port Binding :

• Bind the app to a port, so it’s accessible as a service.

8-Concurrency :

• Scale by running multiple instances of processes.

9-Disposability :

• Make processes start and stop quickly to aid scalability.

10-Dev/prod Parity :

• Keep development and production environments similar.

11-Logs :

• Treat logs as event streams, accessible for monitoring.

12-Admin Processes :

• Run admin tasks (e.g., database updates) separately from the main app.