My NixOS Personal Note

1. NixOS main config files#

1. NixOS config:
/etc/nixos/configuration.nix -> nix default system config.

2. Nix Home Manager config:
~/.config/home-manager/home.nix -> nix home manager config.

2. Adding & Removing Packages#

1. Search for the package name on https://search.nixos.org/packages.
2. Add the desired package(s) in

• configuration.nix:

1
environment.systemPackages = with pkgs; [
2
    obs-studio # contoh meng-install obs-studio
3
];

Then, after adding the package name(s), run this command on the terminal:

1
sudo nixos-rebuild switch # directly switch to a new profile
2
sudo nixos-rebuild boot # apply the alteration on the boot menu
3
sudo nixos-rebuild test # try the change without saving it on the boot menu

• home.nix:

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home.packages = with pkgs; [
2
    obs-studio
3
];

Then, after adding the package name(s), run this command on the terminal:

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home-manager switch

3. Alternatively, install a package as a temporary one:

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nix-shell -p obs-studio

4. To remove package(s), simply remove it from the config files and run this command on the terminal:

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# for configuration.nix
2

3
sudo nixos-rebuild switch # directly switch to a new profile
4
sudo nixos-rebuild boot # apply the alteration on the boot menu
5
sudo nixos-rebuild test # try the change without saving it on the boot menu

or

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home-manager switch # for home.nix

3. Listing & Upgrading Packages¹#

1. Listing Nix channels

1
sudo nix-channel --list

2. Adding/Changing channels

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sudo nix-channel --add {name}

For instance, I would like to add “NixOS” 25.11 channel:

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sudo nix-channel --add https://nixos.org/channels/nixos-25.11 nixos

A similar command goes with “home-manager” 25.11 channel:

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sudo nix-channel --add https://github.com/nix-community/home-manager/archive/release-25.11.tar.gz home-manager

3. Removing channels

1
sudo nix-channel --remove {channel-alias}

For instance, I would like to remove “nixos” channel:

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sudo nix-channel --remove nixos

A similar command goes with “home-manager” channel:

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sudo nix-channel --remove home-manager

4. Updating channels

1
sudo nix-channel --update

Notes: Using the previous command won’t cause a rebuild itself; if you want to update channels and rebuild, use the following command to do both in one step.

5. Upgrading Nix packages

1
sudo nixos-rebuild --upgrade

4. Listing & Deleting NixOS generations#

1. Listing NixOS generations

• Rebuild generations

1
nixos-rebuild list-generations

atau

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sudo nix-env -p /nix/var/nix/profiles/system --list-generations

• Env generations

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nix-env --list-generations

• Home manager generations

1
home-manager generations

2. Deleting NixOS generations

• Deleting rebuild generations

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sudo nix-env -p /nix/var/nix/profiles/system --delete-generations <number>

• Deleting env generations

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nix-env --delete-generations <number>

• Deleting home manager generations

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home-manager remove-generations <number>