Add IPv6 support

Author: bodgit

main.tf

@@ -207,6 +207,14 @@ module "vpc" {
  single_nat_gateway = true
  enable_dns_hostnames = !var.enable_ephemeral_storage
 
+ enable_ipv6 = var.enable_ipv6
+ assign_ipv6_address_on_creation = var.enable_ipv6 ? true : null
+
+ private_subnet_assign_ipv6_address_on_creation = var.enable_ipv6 ? var.private_subnet_assign_ipv6_address_on_creation : null
+
+ public_subnet_ipv6_prefixes = var.public_subnet_ipv6_prefixes
+ private_subnet_ipv6_prefixes = var.private_subnet_ipv6_prefixes
+
  manage_default_security_group = var.manage_default_security_group
  default_security_group_ingress = var.default_security_group_ingress
  default_security_group_egress = var.default_security_group_egress
@@ -234,6 +242,8 @@ module "alb" {
  prefix = var.alb_log_location_prefix
  }
 
+ ip_address_type = var.enable_ipv6 ? "dualstack" : "ipv4"
+
  enable_deletion_protection = var.alb_enable_deletion_protection
 
  drop_invalid_header_fields = var.alb_drop_invalid_header_fields
@@ -405,7 +415,7 @@ module "acm" {
 }
 
 ################################################################################
-# Route53 record
+# Route53 records
 ################################################################################
 resource "aws_route53_record" "atlantis" {
  count = var.create_route53_record ? 1 : 0
@@ -421,6 +431,20 @@ resource "aws_route53_record" "atlantis" {
  }
 }
 
+resource "aws_route53_record" "atlantis-AAAA" {
+ count = var.create_route53_record && var.enable_ipv6 ? 1 : 0
+
+ zone_id = data.aws_route53_zone.this[0].zone_id
+ name = var.route53_record_name != null ? var.route53_record_name : var.name
+ type = "AAAA"
+
+ alias {
+ name = module.alb.lb_dns_name
+ zone_id = module.alb.lb_zone_id
+ evaluate_target_health = true
+ }
+}
+
 ################################################################################
 # EFS
 ################################################################################

variables.tf

@@ -688,3 +688,27 @@ variable "ephemeral_storage_size" {
  error_message = "The minimum supported value is 21 GiB and the maximum supported value is 200 GiB."
  }
 }
+
+variable "enable_ipv6" {
+ description = "Enable IPv6 on the VPC and/or ALB"
+ type = bool
+ default = false
+}
+
+variable "private_subnet_assign_ipv6_address_on_creation" {
+ description = "Assign IPv6 address on private subnet"
+ type = bool
+ default = false
+}
+
+variable "public_subnet_ipv6_prefixes" {
+ description = "Assigns IPv6 private subnet ID based on the Amazon provided /56 prefix"
+ type = list(number)
+ default = []
+}
+
+variable "private_subnet_ipv6_prefixes" {
+ description = "Assigns IPv6 public subnet ID based on the Amazon provided /56 prefix"
+ type = list(number)
+ default = []
+}