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Course Outline
Declarative System Sovereignty
- Understanding why imperative configuration management leads to drift and audit failures.
- Nix store, derivations, and the use of pure functions for system construction.
- Comparing NixOS with traditional distributions: focusing on immutability and atomic upgrades.
Installation and Basics
- Installing NixOS from an ISO image, including manual and automated partitioning methods.
- The Nix language: covering sets, functions, and imports.
- Understanding the structure of configuration.nix and the module system.
- Using 'nix search' and man pages to locate packages and options.
Package and Service Management
- Differentiating between system-wide and per-user package installation with nix-env.
- Enabling systemd services in a declarative manner.
- Implementing custom package overrides and overlays.
- Managing garbage collection and optimizing the Nix store.
Reproducible Environments
- Utilizing nix-shell and shell.nix for ad-hoc development tasks.
- Leveraging Nix Flakes to ensure lockfile-based reproducibility.
- Using devenv and devshell to streamline team onboarding.
- Integrating Direnv for automatic environment switching.
Remote Deployment
- Managing fleets using NixOps and Colmena.
- Configuring remote builds and binary caches.
- Handling secrets management with agenix and sops-nix.
- Testing deployments using NixOS VMs 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 versions for reproducible updates.
- Conducting emergency recovery and configuring the bootloader.
Advanced Topics
- Implementing NixOS containers and lightweight virtualization techniques.
- Handling cross-compilation and ARM builds.
- Generating custom ISO images and netboot images.
- Utilizing Hydra for continuous integration of Nix packages.
Requirements
- Advanced experience in Linux system administration and shell scripting.
- A fundamental grasp of functional programming concepts.
- Familiarity with Git and version-controlled configuration workflows.
Target Audience
- Infrastructure engineers looking for reproducible, declarative systems.
- DevOps teams aiming to replace tools like Ansible, Puppet, or Chef with Nix.
- Organizations that require bit-for-bit reproducible deployments.
21 Hours
