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Course Outline
Declarative System Sovereignty
- Understanding how imperative configuration management leads to drift and audit failures.
- The Nix store, derivations, and the use of pure functions in system construction.
- Comparing NixOS with traditional distributions: immutability and atomic upgrades.
Installation and Basics
- Installing NixOS from ISO images using both manual and automated partitioning methods.
- Introduction to the Nix language: sets, functions, and imports.
- Structure of configuration.nix and the module system.
- Locating packages and options using nix search and man pages.
Package and Service Management
- Differences between system-wide and per-user package installation via nix-env.
- Declarative enabling of systemd services.
- Implementing custom package overrides and overlays.
- Performing garbage collection and optimizing the Nix store.
Reproducible Environments
- Utilizing nix-shell and shell.nix for ad-hoc development setups.
- Achieving lockfile-based reproducibility with Nix Flakes.
- Facilitating team onboarding using devenv and devshell.
- Integrating Direnv for automatic environment switching.
Remote Deployment
- Managing fleets with NixOps and Colmena.
- Configuring remote building and binary caches.
- Handling secrets management using agenix and sops-nix.
- Testing deployments via NixOS virtual machines and containers.
System Updates and Rollbacks
- Navigating nixos-rebuild switch, test, and boot modes.
- Executing atomic rollbacks to previous system generations.
- Managing channels and pinning for consistent updates.
- Performing emergency recovery and configuring the bootloader.
Advanced Topics
- NixOS containers and lightweight virtualization techniques.
- Handling cross-compilation and ARM architecture builds.
- Generating custom ISOs and netboot images.
- Implementing continuous integration for Nix packages with Hydra.
Requirements
- Advanced experience in Linux system administration and shell scripting.
- Foundational knowledge of functional programming concepts.
- Familiarity with Git and version-controlled configuration workflows.
Target Audience
- Infrastructure engineers seeking reproducible, declarative systems.
- DevOps teams aiming to replace Ansible, Puppet, or Chef with Nix.
- Organizations requiring bit-for-bit reproducible deployment environments.
21 Hours
