depot/third_party/nixpkgs/nixos/modules/profiles/headless.nix

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Nix

# Common configuration for headless machines (e.g., Amazon EC2
# instances).
{ lib, ... }:
with lib;
{
# Don't start a tty on the serial consoles.
systemd.services."serial-getty@ttyS0".enable = lib.mkDefault false;
systemd.services."serial-getty@hvc0".enable = false;
systemd.services."getty@tty1".enable = false;
systemd.services."autovt@".enable = false;
# Since we can't manually respond to a panic, just reboot.
boot.kernelParams = [ "panic=1" "boot.panic_on_fail" "vga=0x317" "nomodeset" ];
# Don't allow emergency mode, because we don't have a console.
systemd.enableEmergencyMode = false;
# Being headless, we don't need a GRUB splash image.
boot.loader.grub.splashImage = null;
}