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Title

The Twelve-Factor App

Description

A methodology for building modern, scalable, maintainable software-as-a-service apps.

Keywords

H1

The Twelve-Factor App
Introduction
Background
Who should read this document?
The Twelve Factors

H2

I. Codebase
II. Dependencies
III. Config
IV. Backing Services
V. Build, release, run
VI. Processes
VII. Port binding
VIII. Concurrency
IX. Disposability
X. Dev/prod parity
XI. Logs
XII. Admin processes

H3

One codebase tracked in revision control, many deploys
Explicitly declare and isolate dependencies
Store config in the environment
Treat backing services as attached resources
Strictly separate build and run stages
Execute the app as one or more stateless processes
Export services via port binding
Scale out via the process model
Maximize robustness with fast startup and graceful shutdown
Keep development, staging, and production as similar as possible
Treat logs as event streams
Run admin/management tasks as one-off processes

H4

H5

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production written codebase admin applications dynamics practices maximum architecture developers application building methodology hundreds build software cost minimize service control revision dependencies explicitly deploys ii environment iv dependencies iii config isolate config store declare developer inspired martin fowler’ books terminology accompanying offer conceptual solutions patterns enterprise manage factors i codebase one deploy engineers refactoring services treat ops tracked stateless event streams xii processes run logs logs treat parity keep staging possible xi management tasks download epub book sourcecode updated one-off processes wiggins prod shutdown x processes execute discussing processes vii stages vi separate resources v release run strictly binding export binding viii fast startup graceful robustness disposability maximize concurrency scale process model ix attached working servers systems administration obviating platforms environments suitable cloud divergence enabling applied programming language tooling scale continuous agility execution portability web declarative formats called delivered introduction in commonly setup automation underlying operating offering contract clean joining project combination database organic growth collaboration attention paying wild triangulation ideal app’ avoiding systemic we’ shared awareness raise erosion motivation variety observations contributors involved indirectly background the cache queue memory witnessed operation platform synthesizes experience heroku work scaling thousands vocabulary

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processes services

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backing config dependencies binding treat twelve-factor admin logs codebase build management execute stateless streams export stages tasks attached one-off resources strictly separate scale process development staging shutdown fast graceful environment robustness model maximize event production startup control background introduction document factors iii apps software-as-a-service building methodology modern scalable maintainable release viii deploys revision explicitly declare isolate tracked xii concurrency disposability prod parity store