data "digitalocean_droplet" "k8s_droplets" {
  id = digitalocean_kubernetes_cluster.k8s_cluster.node_pool[0].nodes[0].id
}

resource "null_resource" "ufw" {
  count = 1

  triggers {
     node_ip = "${join(", ", digitalocean_droplet.k8s_droplets.*.ipv4_address)}"
  }