Terraform zone module

example-use.tf

resource "terraform_remote_state" "region" {
  backend = "s3"
  config {
    bucket = "foo"
    key = "bar"
    region = "us-east-1"
  }
}

module "sub1_zone" {
  source = "../zone"
  domain = "sub1.${terraform_remote_state.region.output.domain}"
  parent_zone_id = "${terraform_remote_state.region.output.zone_id}"
  delegation_set_id = "${terraform_remote_state.region.output.delegation_set_id}"
  name_servers = "${terraform_remote_state.region.output.name_servers}"
}

module "sub2_zone" {
  source = "../zone"
  domain = "sub2.${module.sub1_zone.domain}"
  parent_zone_id = "${module.sub1_zone.zone_id}"
  delegation_set_id = "${module.sub1_zone.delegation_set_id}"
  name_servers = "${module.sub1_zone.name_servers}"
}

zone-main.tf

// Delegation set to use for subzones of this zone
resource "aws_route53_delegation_set" "sub" {
  reference_name = "sub.${var.domain}"
}

// Build the zone
resource "aws_route53_zone" "main" {
  delegation_set_id = "${var.delegation_set_id}"
  name = "${var.domain}"
}

// Add NS records to the parent zone
resource "aws_route53_record" "parent-ns" {
  zone_id = "${var.parent_zone_id}"
  name = "${var.domain}"
  type = "NS"
  ttl = "${var.name_server_ttl}"
  records = ["${split(",", var.name_servers)}"] 
}

zone-outputs.tf

output "domain" {
  value = "${var.domain}"
}

output "zone_id" {
  value = "${aws_route53_zone.main.id}"
}

// Delegation set to use for subzones
output "delegation_set_id" {
  value = "${aws_route53_delegation_set.sub.id}"
}

// Name servers for the subzone delegation set
output "name_servers" {
  // join doesn't work with lists :(
  value = "${aws_route53_delegation_set.sub.name_servers.0},${aws_route53_delegation_set.sub.name_servers.1},${aws_route53_delegation_set.sub.name_servers.2},${aws_route53_delegation_set.sub.name_servers.3}"