What is nixos-in-production?

NixOS in Production is a free, open-access book about deploying and maintaining NixOS in real-world production environments. NixOS is a Linux-based operating system built around a declarative configuration model, where you describe what you want the system to look like rather than running commands to change it step by step. The book walks readers through introducing that approach in a production setting. The repository holds the source text for the book, written in Markdown and published via LeanPub. It's still a work in progress, but the author has already contributed practical improvements to the Nix ecosystem while writing it, including better Terraform integration for NixOS and support for running Linux builds on macOS machines. Those tools are documented in the book alongside the broader guidance. The intended audience is engineers and teams evaluating or running NixOS in production. The README doesn't spell out specific chapter topics, but the surrounding work suggests coverage of infrastructure-as-code workflows, cross-platform build setups, and the operational concerns that come with adopting an unconventional Linux distribution at scale. What stands out is the licensing and publishing model. The full book is freely available under a Creative Commons license that allows sharing and adaptation for non-commercial use. The author paid for professional services out of pocket and self-published to keep it open. A print edition is planned for later, and anyone who buys the LeanPub version now gets that amount discounted from the print price. Feedback is welcome through GitHub issues, but pull requests aren't accepted so the author retains sole commercialization rights.