12 Factor App

[https://12factor.net/]

• I. Codebase

One codebase tracked in revision control, many deploys

• II. Dependencies

Explicitly declare and isolate dependencies

• III. Config

Store config in the environment

• IV. Backing services

Treat backing services as attached resources

• V. Build, release, run

Strictly separate build and run stages

• VI. Processes

Execute the app as one or more stateless processes

• VII. Port binding

Export services via port binding

• VIII. Concurrency

Scale out via the process model

• IX. Disposability

Maximize robustness with fast startup and graceful shutdown

• X. Dev/prod parity

Keep development, staging, and production as similar as possible

• XI. Logs

Treat logs as event streams

• XII. Admin processes

Run admin/management tasks as one-off processes