feat: Add IPv6 support (ALB and Route53 AAAA record) (#256)

Author: bodgit

README.md

@@ -269,6 +269,7 @@ allow_github_webhooks        = true
 | [aws_lb_listener_rule.unauthenticated_access_for_cidr_blocks](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_listener_rule) | resource |
 | [aws_lb_listener_rule.unauthenticated_access_for_webhook](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_listener_rule) | resource |
 | [aws_route53_record.atlantis](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route53_record) | resource |
+| [aws_route53_record.atlantis_aaaa](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route53_record) | resource |
 | [aws_ssm_parameter.atlantis_bitbucket_user_token](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ssm_parameter) | resource |
 | [aws_ssm_parameter.atlantis_github_user_token](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ssm_parameter) | resource |
 | [aws_ssm_parameter.atlantis_gitlab_user_token](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ssm_parameter) | resource |
@@ -294,6 +295,7 @@ allow_github_webhooks        = true
 | <a name="input_alb_http_security_group_tags"></a> [alb\_http\_security\_group\_tags](#input\_alb\_http\_security\_group\_tags) | Additional tags to put on the http security group | `map(string)` | `{}` | no |
 | <a name="input_alb_https_security_group_tags"></a> [alb\_https\_security\_group\_tags](#input\_alb\_https\_security\_group\_tags) | Additional tags to put on the https security group | `map(string)` | `{}` | no |
 | <a name="input_alb_ingress_cidr_blocks"></a> [alb\_ingress\_cidr\_blocks](#input\_alb\_ingress\_cidr\_blocks) | List of IPv4 CIDR ranges to use on all ingress rules of the ALB. | `list(string)` | <pre>[<br>  "0.0.0.0/0"<br>]</pre> | no |
+| <a name="input_alb_ip_address_type"></a> [alb\_ip\_address\_type](#input\_alb\_ip\_address\_type) | The type of IP addresses used by the subnets for your load balancer. The possible values are ipv4 and dualstack | `string` | `"ipv4"` | no |
 | <a name="input_alb_listener_ssl_policy_default"></a> [alb\_listener\_ssl\_policy\_default](#input\_alb\_listener\_ssl\_policy\_default) | The security policy if using HTTPS externally on the load balancer. [See](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/create-https-listener.html). | `string` | `"ELBSecurityPolicy-2016-08"` | no |
 | <a name="input_alb_log_bucket_name"></a> [alb\_log\_bucket\_name](#input\_alb\_log\_bucket\_name) | S3 bucket (externally created) for storing load balancer access logs. Required if alb\_logging\_enabled is true. | `string` | `""` | no |
 | <a name="input_alb_log_location_prefix"></a> [alb\_log\_location\_prefix](#input\_alb\_log\_location\_prefix) | S3 prefix within the log\_bucket\_name under which logs are stored. | `string` | `""` | no |
@@ -334,7 +336,8 @@ allow_github_webhooks        = true
 | <a name="input_container_memory"></a> [container\_memory](#input\_container\_memory) | The amount (in MiB) of memory used by the atlantis container. If not specified ecs\_task\_memory will be used | `number` | `null` | no |
 | <a name="input_container_memory_reservation"></a> [container\_memory\_reservation](#input\_container\_memory\_reservation) | The amount of memory (in MiB) to reserve for the container | `number` | `128` | no |
 | <a name="input_create_ecs_cluster"></a> [create\_ecs\_cluster](#input\_create\_ecs\_cluster) | Whether to create an ECS cluster or not | `bool` | `true` | no |
-| <a name="input_create_route53_record"></a> [create\_route53\_record](#input\_create\_route53\_record) | Whether to create Route53 record for Atlantis | `bool` | `true` | no |
+| <a name="input_create_route53_aaaa_record"></a> [create\_route53\_aaaa\_record](#input\_create\_route53\_aaaa\_record) | Whether to create Route53 AAAA record for Atlantis | `bool` | `false` | no |
+| <a name="input_create_route53_record"></a> [create\_route53\_record](#input\_create\_route53\_record) | Whether to create Route53 A record for Atlantis | `bool` | `true` | no |
 | <a name="input_custom_container_definitions"></a> [custom\_container\_definitions](#input\_custom\_container\_definitions) | A list of valid container definitions provided as a single valid JSON document. By default, the standard container definition is used. | `string` | `""` | no |
 | <a name="input_custom_environment_secrets"></a> [custom\_environment\_secrets](#input\_custom\_environment\_secrets) | List of additional secrets the container will use (list should contain maps with `name` and `valueFrom`) | <pre>list(object(<br>    {<br>      name      = string<br>      valueFrom = string<br>    }<br>  ))</pre> | `[]` | no |
 | <a name="input_custom_environment_variables"></a> [custom\_environment\_variables](#input\_custom\_environment\_variables) | List of additional environment variables the container will use (list should contain maps with `name` and `value`) | <pre>list(object(<br>    {<br>      name  = string<br>      value = string<br>    }<br>  ))</pre> | `[]` | no |

main.tf

@@ -131,7 +131,7 @@ data "aws_partition" "current" {}
 data "aws_region" "current" {}
 
 data "aws_route53_zone" "this" {
-  count = var.create_route53_record ? 1 : 0
+  count = var.create_route53_record || var.create_route53_aaaa_record ? 1 : 0
 
   name         = var.route53_zone_name
   private_zone = var.route53_private_zone
@@ -234,6 +234,8 @@ module "alb" {
     prefix  = var.alb_log_location_prefix
   }
 
+  ip_address_type = var.alb_ip_address_type
+
   enable_deletion_protection = var.alb_enable_deletion_protection
 
   drop_invalid_header_fields = var.alb_drop_invalid_header_fields
@@ -405,7 +407,7 @@ module "acm" {
 }
 
 ################################################################################
-# Route53 record
+# Route53 records
 ################################################################################
 resource "aws_route53_record" "atlantis" {
   count = var.create_route53_record ? 1 : 0
@@ -421,6 +423,20 @@ resource "aws_route53_record" "atlantis" {
   }
 }
 
+resource "aws_route53_record" "atlantis_aaaa" {
+  count = var.create_route53_aaaa_record ? 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

@@ -231,7 +231,7 @@ variable "route53_private_zone" {
 }
 
 variable "create_route53_record" {
-  description = "Whether to create Route53 record for Atlantis"
+  description = "Whether to create Route53 A record for Atlantis"
   type        = bool
   default     = true
 }
@@ -688,3 +688,15 @@ variable "ephemeral_storage_size" {
     error_message = "The minimum supported value is 21 GiB and the maximum supported value is 200 GiB."
   }
 }
+
+variable "alb_ip_address_type" {
+  description = "The type of IP addresses used by the subnets for your load balancer. The possible values are ipv4 and dualstack"
+  type        = string
+  default     = "ipv4"
+}
+
+variable "create_route53_aaaa_record" {
+  description = "Whether to create Route53 AAAA record for Atlantis"
+  type        = bool
+  default     = false
+}