Obtain the minimal ISO image required to boot and install on UTM

Create partitions

cfdisk /dev/vda
# Choose gpt then create 3 partitions
# 1) EFI system for boot, 1G
# 2) Swap partition, 5G
# 3) Linux filesystem, 16G
# Write and quit

Create and mount filesystems

# use /dev/vda for the ARM64 machine, and /dev/sda for the x86_64 machine
mkfs.fat -F 32 -n boot /dev/vda1
mkswap -L swap /dev/vda2
mkfs.ext4 -L nixos /dev/vda3
# mount
mount /dev/vda3 /mnt
mkdir -p /mnt/boot
mount /dev/vda1 /mnt/boot
# enable swap
swapon /dev/vda2

Clone configuration and install

git clone https://github.com/koraybey/nixos-builder
cd nixos-builder && sudo nixos-install --root /mnt --flake .#builder-aarch64
# shutdown
shutdown now

Remove the image and boot the virtual machine

Enable nebula by moving nebula certs and make them readable: https://nixos.wiki/wiki/Nebula

# Move certs to /etc/nebula, then
sudo chmod --reference /etc/nix /etc/nebula
sudo chmod --reference /etc/nix/nix.conf /etc/nebula/*

Copy the pre-generated builder key to user dir and rebuild the remote machine

cp id_ed25519 ~/.ssh/
# https://nixos.wiki/wiki/Nixos-rebuild
nixos-rebuild --target-host [email protected] --use-remote-sudo switch --flake
.#med-nixos-rpi