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Learn how NixOS replaces ad-hoc server management with a single declarative configuration file, how nixos-rebuild builds and activates system generations, and how to roll back safely when a change fails.
Imperative system changes cause drift that makes replication hard. NixOS solves this by defining the entire system in a single declarative file.
Declare all NixOS state in configuration.nix, test before switching, keep secrets out of the Nix store, and roll back failed generations.
How to decide if NixOS fits your infrastructure, where trust boundaries sit, and how to check generations and garbage collection.
NixOS makes system changes atomic by storing each activation as an immutable generation. Learn how to verify a rollback target and clean up safely.
Architecture note on how NixOS uses an immutable Nix store and generation pointers to provide atomic upgrades, rollback, and clear trust boundaries for declarative system configuration.
NixOS makes the running system a pure function of configuration.nix. nixos-rebuild switch builds an immutable generation and updates the bootloader atomically, giving instant rollback without manual restores.
NixOS makes a bad configuration change recoverable by keeping the previous system generation bootable. Here is how generations work, a worked SSH/user example, and the limits of rollback.
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