terraform-libvirt/stack/volumes.tf

# https://github.com/dmacvicar/terraform-provider-libvirt/blob/master/website/docs/r/volume.html.markdown

# -------- root disk use by compute --------
# ~> Tip: when provisioning multiple domains using the same base image, create a libvirt_volume for the base image and then define 
# the domain specific ones as based on it. This way the image will not be modified and no extra disk space is going to be used for the base image.

resource "libvirt_volume" "root_centos" {
  name             = "my-root-centos"
  pool             = var.pool_1
  base_volume_name = local.centos7_qcow2
}

resource "libvirt_volume" "root_debian" {
  name             = format("root-debian-%s", count.index)
  pool             = var.pool_1
  base_volume_name = local.debian_buster_qcow2
  count            = local.number_domain
}

resource "libvirt_volume" "external_disk" {
  name = format("external-disk-%s", count.index)
  # 10Gb
  size  = 10737418240
  pool  = var.pool_1
  count = local.number_domain
}