The Twelve-Factor App

I was talking to a friend of mine this week and he pointed me to something I’d never heard of before. The Twelve-Factor App from Heroku. I will share the core of the philosophy and the 12 factors, but I encourage you to read them in detail at Lots of great takeaways here.
 From The Introduction:
 In the modern era, software is commonly delivered as a service: called web apps, or software-as-a-service. The twelve-factor app is a methodology for building software-as-a-service apps that:
 * Use declarative formats for setup automation, to minimize time and cost for new developers joining the project;
 * Have a clean contract with the underlying operating system, offering maximum portability between execution environments;
 * Are suitable for deployment on modern cloud platforms, obviating the need for servers and systems administration;
 * Minimize divergence between development and production, enabling continuous deployment for maximum agility;
 * And can scale up without significant changes to tooling, architecture, or development practices.
 The twelve-factor methodology can be applied to apps written in any programming language, and which use any combination of backing services (database, queue, memory cache, etc).
 The Twelve Factors
 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

Originally published at

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