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installation-demo-dual.md

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Example Ubuntu/NixOS dual boot installation (qemu-kvm, UEFI, LUKS, BTRFS, grub2)

Preparation

  • Install and boot Ubuntu (see example)

  • Install nix

    sh <(curl -L https://nixos.org/nix/install) --daemon

  • Switch to root user

File system

  • Create filesystems

    mount /dev/mapper/crypt /mnt/
mkdir /mnt/@nix
btrfs subvolume create /mnt/@nix/root
btrfs subvolume create /mnt/@nix/nix
btrfs subvolume create /mnt/@nix/var
btrfs subvolume create /mnt/@nix/home
btrfs subvolume create /mnt/@nix/home/.snapshots
btrfs subvolume create /mnt/@nix/data
umount /mnt

  • Mount volumes

    mount /dev/mapper/crypt -o subvol=@nix/root,noatime,compress=zstd:1 /mnt
mkdir -p /mnt/{boot/efi,data,etc/luks,home,nix,var}
mount /dev/disk/by-label/boot /mnt/boot/efi
mount /dev/mapper/crypt -o subvol=@nix/data,noatime,compress=zstd:1 /mnt/data
mount /dev/mapper/crypt -o subvol=@nix/home,noatime,compress=zstd:1 /mnt/home
mount /dev/mapper/crypt -o subvol=@nix/nix,noatime,compress=zstd:1 /mnt/nix
mount /dev/mapper/crypt -o subvol=@nix/var,noatime,compress=zstd:1 /mnt/var

  • Copy LUKS keyfile (optional)

    cp /etc/luks/boot.keyfile /mnt/etc/luks/

Swap

  • Create swap file

    truncate -s 0 /mnt/.swapfile
chattr +C /mnt/.swapfile
btrfs property set /mnt/.swapfile compression none
fallocate -l 4G /mnt/.swapfile
chmod 600 /mnt/.swapfile

Installation

  • Enter Nix shell

    nix-shell -p git nixos-install-tools

  • Clone repository

    cd /mnt/data
git clone https://github.com/mrkuz/nixos.git
cd nixos

  • Change dotfiles.url in flake.nix to point to the GitHub repository, not local directory.

    {
  dotfiles = {
    url = "github:mrkuz/dotfiles";
    flake = false;
  };
}

  • Update inputs

    export NIX_CONFIG="experimental-features = nix-command flakes"
./scripts/update.sh

  • Install

    nixos-install --root /mnt --flake /mnt/data/nixos#demo-dual

  • Reboot

Final steps

  • Move configuration to final location

    mkdir -p ~/etc/
sudo mv /data/nixos ~/etc
sudo chown user:user -R ~/etc/nixos
cd ~/etc/nixos

  • Initialize submodules

    git submodule init
git submodule update

  • Clone nixpkgs (optional)

    sudo git clone https://github.com/NixOS/nixpkgs.git /nix/nixpkgs
cd /nix/nixpkgs
sudo git checkout nixos-unstable

  • Update and rebuild system

    ./scripts/update.sh
./scripts/rebuild.sh demo-dual