I'm new to NixOS, and this repository contains my experiments with the system and user configuration.
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Build the system and switch
sudo nixos-rebuild switch --flake .#flaked-nixos -
Build the system, make it the new default, but don't switch to it yet (only at the next restart)
sudo nixos-rebuild boot --flake .#flaked-nixos -
Update only a single flake input
nix flake lock --update-input <name1> --update-input <name2> ... -
Remove generations older than a given period
sudo nix-collect-garbage --delete-older-than 15d -
Remove all old generations (no rollback possible to old generations, use with caution)
sudo nix-collect-garbage -d
The remove commands above won't rebuild the GRUB configuration, so the old entries remain in your boot menu. They get clean up if you rebuild the system config again with one of the first commands. If you can't rebuild the system locally (e.g. on a server), then you can use these two commands:
sudo nix-env --delete-generations old --profile /nix/var/nix/profiles/system
sudo /nix/var/nix/profiles/system/bin/switch-to-configuration switch