LDAPWiki: The Twelve-Factor App

Overview#

The Twelve-Factor App is a methodology for building Software as a Service appsThe Twelve Factors (or Principals) are:

I. Codebase - One codebase tracked in Version Control System, many deploys
II. Dependencies - Explicitly declare and isolate dependencies
III. Config - Store Configuration in the environment (Configuration Management)
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 tier, Deployment tier, and Production tier as similar as possible
XI. Logs - Treat logs as event streams
XII. Admin processes - Run admin/management tasks as one-off processes

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