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Developer tools · #nixos
NixOS builds each system version as an immutable closure in the Nix store; switching updates symlinks atomically, and the --rollback flag lets you return to a prior generation when a change fails.
Learn how to safely apply a new NixOS configuration, upgrade the system, and verify the changes with nixos-rebuild. The guide covers prerequisites, step‑by‑step commands, checks, and rollback options.
Learn how to add a custom patched package (e.g., a modified Emacs) to NixOS using an overlay, with step‑by‑step instructions, verification, and rollback.
Learn how NixOS creates immutable generations, how to list, rollback, and clean them, and what disk‑space trade‑offs to watch.
NixOS lets you upgrade and roll back an entire Linux system atomically by switching generation symlinks, eliminating configuration drift and boot‑failure recovery headaches.
NixOS’s system generations turn upgrades into a risk‑free experiment. Learn how atomic rollbacks, disk‑space trade‑offs, and mutable‑state limits shape a safe upgrade workflow, complete with a step‑by‑step example.
Learn how NixOS generations provide atomic upgrades and instant rollbacks, with a concrete example, verification steps, and practical limits on data and disk usage.
Learn how NixOS creates immutable system generations, performs atomic upgrades with `nixos-rebuild switch`, and rolls back safely—plus what to watch for when garbage collection threatens those generations.
NixOS system generations give you atomic, bootloader-integrated rollbacks. A kernel update breaks Wi-Fi? Reboot, pick the previous generation, run nixos-rebuild switch --rollback. Done. But generations consume disk space and don't touch user data — here's how to manage both.