$ cat main.tf
terraform {
  required_providers {
    libvirt = {
      source  = "dmacvicar/libvirt"
    }
  }
}

provider "libvirt" {
  uri = "qemu:///system"
}

resource "libvirt_volume" "os_image_ubuntu" {
  name   = "os_image_ubuntu"
  pool   = "default"
  source = "./bionic-server-cloudimg-amd64.img"
  format = "qcow2"
}

resource "libvirt_volume" "disk_ubuntu_resized" {
  name           = "disk"
  base_volume_id = libvirt_volume.os_image_ubuntu.id
  pool           = "default"
  size           = 34359738368 # 1073741824*32 ou 1024*1024*1024*32
}

data "template_file" "user_data" {
  template = file("${path.module}/cloud_init.cfg")
}

# Use CloudInit to add our ssh-key to the instance
resource "libvirt_cloudinit_disk" "cloudinit_ubuntu_resized" {
  name = "cloudinit_ubuntu_resized.iso"
  user_data = data.template_file.user_data.rendered
  pool = "default"
}

resource "libvirt_domain" "ubuntu-terraform" {
  name = "ubuntu-terraform"
  memory = "2048"
  vcpu = 2

  cpu {
    mode = "host-passthrough"
  }

  cloudinit = libvirt_cloudinit_disk.cloudinit_ubuntu_resized.id

  network_interface {
    network_name = "default"
    wait_for_lease = true
  }

  console {
    type = "pty"
    target_port = "0"
    target_type = "serial"
  }

  console {
    type = "pty"
    target_type = "virtio"
    target_port = "1"
  }

  disk {
    volume_id = libvirt_volume.disk_ubuntu_resized.id
  }

  graphics {
    type = "spice"
    listen_type = "address"
    autoport = true
  }
}

output "ip" {
  value = libvirt_domain.ubuntu-terraform.network_interface[0].addresses[0]
}