nix-infra/configuration/nixos-generators/default.nix

{ ... }:
{
  boot.loader.grub = {
    enable = true;
    device = "/dev/vda";
  };

  networking = {
    hostName = "base";
    firewall.enable = true;
  };

  proxmox = {
    qemuConf = {
      ostype = "l26";
      cores = 2;
      memory = 1024;
      bios = "seabios";
      # Option not available in 23.05
      # diskSize = "8096";
      virtio0 = "local-zfs:base-disk-0,discard=on";
      boot = "order=virtio0";
      net0 = "tag=999,virtio=00:00:00:00:00:00,bridge=vmbr0,firewall=1";
      agent = true;
    };
    qemuExtraConf = {
      cpu = "cputype=host,flags=+aes";
      onboot = 1;
      machine = "q35";
      template = 1;
    };
  };

  system.stateVersion = "23.05";
}