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Course Outline
Declarative System Sovereignty
- Understanding why imperative configuration management leads to drift and audit failures.
- Nix store, derivations, and pure functions for system building.
- NixOS compared to traditional distributions: immutability and atomic upgrades.
Installation and Fundamentals
- Installing NixOS from an ISO file using manual or automated partitioning methods.
- The Nix language: sets, functions, and imports.
- Structure of configuration.nix and the module system.
- Searching for packages and options using nix search and man pages.
Package and Service Management
- Installing packages system-wide versus per-user with nix-env.
- Enabling systemd services declaratively.
- Implementing custom package overrides and overlays.
- Garbage collection and store optimization techniques.
Reproducible Environments
- nix-shell and shell.nix for ad-hoc development setups.
- Nix Flakes for lockfile-based reproducibility.
- devenv and devshell tools to streamline team onboarding.
- Direnv integration for automatic environment switching.
Remote Deployment
- NixOps and Colmena for fleet management.
- Configuring remote building and binary caches.
- Managing secrets using agenix and sops-nix.
- Deployment testing with NixOS VMs and containers.
System Updates and Rollbacks
- Using nixos-rebuild in switch, test, and boot modes.
- Performing atomic rollbacks to previous generations.
- Managing channels and pinning versions for reproducible updates.
- Emergency recovery procedures and bootloader configuration.
Advanced Topics
- NixOS containers and lightweight virtualization.
- Cross-compilation and ARM builds.
- Generating custom ISOs and netboot images.
- Hydra continuous integration for Nix packages.
Requirements
- Advanced experience in Linux system administration and shell scripting.
- Basic understanding of functional programming concepts.
- Familiarity with Git and version-controlled configuration workflows.
Audience
- Infrastructure engineers aiming for reproducible, declarative systems.
- DevOps teams seeking to replace Ansible, Puppet, or Chef with Nix.
- Organizations requiring bit-for-bit reproducible deployments.
21 Hours
