Added support for EC2 ClassicLink (#322)

Author: antonbabenko

README.md

@@ -294,6 +294,8 @@ Sometimes it is handy to have public access to Redshift clusters (for example if
 | elasticloadbalancing\_endpoint\_security\_group\_ids | The ID of one or more security groups to associate with the network interface for Elastic Load Balancing endpoint | list(string) | `[]` | no |
 | elasticloadbalancing\_endpoint\_subnet\_ids | The ID of one or more subnets in which to create a network interface for Elastic Load Balancing endpoint. Only a single subnet within an AZ is supported. If omitted, private subnets will be used. | list(string) | `[]` | no |
 | enable\_apigw\_endpoint | Should be true if you want to provision an api gateway endpoint to the VPC | bool | `"false"` | no |
+| enable\_classiclink | Should be true to enable ClassicLink for the VPC. Only valid in regions and accounts that support EC2 Classic. | bool | `"null"` | no |
+| enable\_classiclink\_dns\_support | Should be true to enable ClassicLink DNS Support for the VPC. Only valid in regions and accounts that support EC2 Classic. | bool | `"null"` | no |
 | enable\_cloudtrail\_endpoint | Should be true if you want to provision a CloudTrail endpoint to the VPC | bool | `"false"` | no |
 | enable\_codebuild\_endpoint | Should be true if you want to provision an Codebuild endpoint to the VPC | string | `"false"` | no |
 | enable\_codecommit\_endpoint | Should be true if you want to provision an Codecommit endpoint to the VPC | string | `"false"` | no |

examples/complete-vpc/main.tf

@@ -12,21 +12,24 @@ module "vpc" {
 
   name = "complete-example"
 
-  cidr = "10.10.0.0/16"
+  cidr = "20.10.0.0/16" # 10.0.0.0/8 is reserved for EC2-Classic
 
   azs                 = ["eu-west-1a", "eu-west-1b", "eu-west-1c"]
-  private_subnets     = ["10.10.1.0/24", "10.10.2.0/24", "10.10.3.0/24"]
-  public_subnets      = ["10.10.11.0/24", "10.10.12.0/24", "10.10.13.0/24"]
-  database_subnets    = ["10.10.21.0/24", "10.10.22.0/24", "10.10.23.0/24"]
-  elasticache_subnets = ["10.10.31.0/24", "10.10.32.0/24", "10.10.33.0/24"]
-  redshift_subnets    = ["10.10.41.0/24", "10.10.42.0/24", "10.10.43.0/24"]
-  intra_subnets       = ["10.10.51.0/24", "10.10.52.0/24", "10.10.53.0/24"]
+  private_subnets     = ["20.10.1.0/24", "20.10.2.0/24", "20.10.3.0/24"]
+  public_subnets      = ["20.10.11.0/24", "20.10.12.0/24", "20.10.13.0/24"]
+  database_subnets    = ["20.10.21.0/24", "20.10.22.0/24", "20.10.23.0/24"]
+  elasticache_subnets = ["20.10.31.0/24", "20.10.32.0/24", "20.10.33.0/24"]
+  redshift_subnets    = ["20.10.41.0/24", "20.10.42.0/24", "20.10.43.0/24"]
+  intra_subnets       = ["20.10.51.0/24", "20.10.52.0/24", "20.10.53.0/24"]
 
   create_database_subnet_group = false
 
   enable_dns_hostnames = true
   enable_dns_support   = true
 
+  enable_classiclink             = true
+  enable_classiclink_dns_support = true
+
   enable_nat_gateway = true
   single_nat_gateway = true
 

main.tf

@@ -33,6 +33,8 @@ resource "aws_vpc" "this" {
   instance_tenancy                 = var.instance_tenancy
   enable_dns_hostnames             = var.enable_dns_hostnames
   enable_dns_support               = var.enable_dns_support
+  enable_classiclink               = var.enable_classiclink
+  enable_classiclink_dns_support   = var.enable_classiclink_dns_support
   assign_generated_ipv6_cidr_block = var.enable_ipv6
 
   tags = merge(

variables.tf

@@ -256,6 +256,18 @@ variable "enable_dns_support" {
   default     = true
 }
 
+variable "enable_classiclink" {
+  description = "Should be true to enable ClassicLink for the VPC. Only valid in regions and accounts that support EC2 Classic."
+  type        = bool
+  default     = null
+}
+
+variable "enable_classiclink_dns_support" {
+  description = "Should be true to enable ClassicLink DNS Support for the VPC. Only valid in regions and accounts that support EC2 Classic."
+  type        = bool
+  default     = null
+}
+
 variable "enable_nat_gateway" {
   description = "Should be true if you want to provision NAT Gateways for each of your private networks"
   type        = bool