My notes from the DevOps Handbook

by Gene Kim, Jez Humble, Patrick Debois, John Willis

The Three Ways: Principles Underpinning DevOps

The First Way

• fast flow from left to right
• Dev -> Ops -> customers

In order to maximize flow:

• visible work
• small batch sizes
• short intervals of work
• quality at the source
• constant optimization for global goals

Because we sped up the flow:

• reduced lead time
• reduced time to deploy
• increased quality
• increased throughput
• increased ability to out-experiment the competition

Resulting practices:

• continuous build
• continuous integration
• continuous test
• continuous deployment
• creating environments on-demand
• limiting work in process
• safe to change systems

The Second Way

• fast and constant flow of feedback from right to left
• faster detection and recovery
• ever-safer systems of work where problems are found before catastrophic failure

The Third Way

• generative, high-trust culture
• dynamic, disciplined and scientific approach to experimentation
• risk taking
• shorten and amplify feedback loops
• learn faster than competition through experiments
• local discoveries -> global improvements