The 12 factor app states that applications should read config from environment variables. It implies separation of code and config. That’s about it, but there’s good bones here. I want something bigger from this factor. Specifically that applications may be deployed to new environments without any code changes. This requires a few additions:
- Configure the process through command options and environment variables
- Prefer explicit configuration over implicit configuration
- Use a dry run option to verify config sanity
- Fail fast on any configuration error
Mentioned in Show
- Where, What, and How to Test on the Ruby Testing Podcast
Freebies
- Mastering the Third Way of DevOps use the Toyota Kata for continuous improvement
- Free DevOps Course much more detailed than what we can cover in the podcast
- Products over Projects expand flow, feedback, and learning to the entire organization
Resources
- Transcript
- The 12 Factor App
- My Review & Analysis on The DevOps Handbook
- My Review & Analysis on Accelerate
- Software Development in 3 Principles & 4 Metrics
Books
- The DevOps Handbook by Gene Kim, Jez Humble, John Willis, Patrick Debois
- Accelerate by Nicole Forsgren, Jez Humble, Gene Kim