Initial attempt is working.

.gitignore

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+################################################################################
+# Pulled from github/gitignore 2021-11-10 commit 1a84870
+################################################################################
+
+# Local .terraform directories
+**/.terraform/*
+
+# .tfstate files
+*.tfstate
+*.tfstate.*
+
+# Crash log files
+crash.log
+
+# Exclude all .tfvars files, which are likely to contain sentitive data, such as
+# password, private keys, and other secrets. These should not be part of version
+# control as they are data points which are potentially sensitive and subject
+# to change depending on the environment.
+#
+*.tfvars
+
+# Ignore override files as they are usually used to override resources locally and so
+# are not checked in
+override.tf
+override.tf.json
+*_override.tf
+*_override.tf.json
+
+# Include override files you do wish to add to version control using negated pattern
+#
+# !example_override.tf
+
+# Include tfplan files to ignore the plan output of command: terraform plan -out=tfplan
+# example: *tfplan*
+
+# Ignore CLI configuration files
+.terraformrc
+terraform.rc

README.md

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+
+Dependencies
+----------------------------------------
+
+TODO REM add libvirt provider
+libvirt provider depends on mkisofs
+
+security_driver = none for ubuntu host, link github issue.
+https://github.com/dmacvicar/terraform-provider-libvirt/issues/546
+

get-vm-ips.sh

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+#!/bin/sh
+
+# Use eval $(./get-vm-ips.sh) to set env vars for ips.
+
+terraform refresh > /dev/null
+IPS_JSON="$(terraform show -json | jq '.values.root_module.resources[] | select(.type == "libvirt_domain") | {name: .values.name, ip: .values.network_interface[0].addresses[0]}')"
+
+echo $IPS_JSON | \
+    jq 'select(.name | contains("master")) | .ip' | \
+    xargs -I% echo export MASTER=%
+
+echo $IPS_JSON | \
+    jq 'select(.name | contains("worker")) | .ip' | \
+    nl -v 0 | \
+    awk '{print "export WORKER" $1 "=" $2}' | \
+    sed 's/"//g'
+

main.tf

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+terraform {
+  required_providers {
+    libvirt = {
+      source = "dmacvicar/libvirt"
+    }
+  }
+}
+
+provider "libvirt" {
+  uri = "qemu+ssh://gert@gertie/system"
+}
+
+resource "libvirt_pool" "images" {
+  name = "k8s-tf-images"
+  type = "dir"
+  path = var.disk-image-dir
+}
+
+resource "libvirt_volume" "master-image" {
+  name   = "k8s-tf-master"
+  pool   = libvirt_pool.images.name
+  source = var.ubuntu-image
+  format = "qcow2"
+}
+
+resource "libvirt_volume" "worker-volumes" {
+  name   = "k8s-tf-worker-${count.index}"
+  pool   = libvirt_pool.images.name
+  source = var.ubuntu-image
+  format = "qcow2"
+  count  = var.worker-nodes
+}
+
+data "template_file" "user_data" {
+  template = file("${path.module}/cloud_init.cfg")
+}
+
+data "template_file" "network_config" {
+  template = file("${path.module}/network_config.cfg")
+}
+
+# for more info about paramater check this out
+# https://github.com/dmacvicar/terraform-provider-libvirt/blob/master/website/docs/r/cloudinit.html.markdown
+# Use CloudInit to add our ssh-key to the instance
+# you can add also meta_data field
+resource "libvirt_cloudinit_disk" "commoninit" {
+  name           = "commoninit.images"
+  user_data      = data.template_file.user_data.rendered
+  network_config = data.template_file.network_config.rendered
+  pool           = libvirt_pool.images.name
+}
+
+# Create the machine
+resource "libvirt_domain" "master-domain" {
+  name   = "k8s-tf-master"
+  memory = var.node-memory
+  vcpu   = var.node-vcpus
+
+  cloudinit = libvirt_cloudinit_disk.commoninit.id
+
+  network_interface {
+    network_name = "default"
+  }
+
+  # IMPORTANT: this is a known bug on cloud images, since they expect a console
+  # we need to pass it
+  # https://bugs.launchpad.net/cloud-images/+bug/1573095
+  console {
+    type        = "pty"
+    target_port = "0"
+    target_type = "serial"
+  }
+
+  console {
+    type        = "pty"
+    target_type = "virtio"
+    target_port = "1"
+  }
+
+  disk {
+    volume_id = libvirt_volume.master-image.id
+  }
+
+  graphics {
+    type        = "spice"
+    listen_type = "address"
+    autoport    = true
+  }
+}
+
+resource "libvirt_domain" "worker-domains" {
+  count = var.worker-nodes
+  name   = "k8s-tf-worker-${count.index}"
+  memory = var.node-memory
+  vcpu   = var.node-vcpus
+
+  cloudinit = libvirt_cloudinit_disk.commoninit.id
+
+  network_interface {
+    network_name = "default"
+  }
+
+  # IMPORTANT: this is a known bug on cloud images, since they expect a console
+  # we need to pass it
+  # https://bugs.launchpad.net/cloud-images/+bug/1573095
+  console {
+    type        = "pty"
+    target_port = "0"
+    target_type = "serial"
+  }
+
+  console {
+    type        = "pty"
+    target_type = "virtio"
+    target_port = "1"
+  }
+
+  disk {
+    volume_id = element(libvirt_volume.worker-volumes.*.id, count.index)
+  }
+
+  graphics {
+    type        = "spice"
+    listen_type = "address"
+    autoport    = true
+  }
+}

variables.tf

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+
+variable "disk-image-dir" {
+  description = "This is the location on the KVM hypervisor host where all the disk images will be kept."
+}
+
+variable "node-memory" {
+  default     = "2048"
+  description = "The amount of memory to be used for all the nodes."
+  type        = number
+}
+
+variable "node-vcpus" {
+  default     = "2"
+  description = "The amount of vcpus to be used for all the nodes."
+  type        = number
+}
+
+variable "worker-nodes" {
+  default     = "2"
+  description = "The number of worker nodes to create."
+  type        = number
+}
+
+variable "ubuntu-image" {
+  default = "https://cloud-images.ubuntu.com/releases/focal/release/ubuntu-20.04-server-cloudimg-amd64-disk-kvm.img"
+}