nixpkgs/nixos/doc/manual/installation/installing-virtualbox-guest.section.md
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Installing in a VirtualBox guest

Installing NixOS into a VirtualBox guest is convenient for users who want to try NixOS without installing it on bare metal. If you want to use a pre-made VirtualBox appliance, it is available at the downloads page. If you want to set up a VirtualBox guest manually, follow these instructions:

  1. Add a New Machine in VirtualBox with OS Type "Linux / Other Linux"

  2. Base Memory Size: 768 MB or higher.

  3. New Hard Disk of 8 GB or higher.

  4. Mount the CD-ROM with the NixOS ISO (by clicking on CD/DVD-ROM)

  5. Click on Settings / System / Processor and enable PAE/NX

  6. Click on Settings / System / Acceleration and enable "VT-x/AMD-V" acceleration

  7. Click on Settings / Display / Screen and select VMSVGA as Graphics Controller

  8. Save the settings, start the virtual machine, and continue installation like normal

There are a few modifications you should make in configuration.nix. Enable booting:

boot.loader.grub.device = "/dev/sda";

Also remove the fsck that runs at startup. It will always fail to run, stopping your boot until you press *.

boot.initrd.checkJournalingFS = false;

Shared folders can be given a name and a path in the host system in the VirtualBox settings (Machine / Settings / Shared Folders, then click on the "Add" icon). Add the following to the /etc/nixos/configuration.nix to auto-mount them. If you do not add "nofail", the system will not boot properly.

{ config, pkgs, ...} :
{
  fileSystems."/virtualboxshare" = {
    fsType = "vboxsf";
    device = "nameofthesharedfolder";
    options = [ "rw" "nofail" ];
  };
}

The folder will be available directly under the root directory.