Added amazon_side_asn to vpn_gateway

Author: antonbabenko

README.md

@@ -163,6 +163,7 @@ Terraform version 0.10.3 or newer is required for this module to work.
 
 | Name | Description | Type | Default | Required |
 |------|-------------|:----:|:-----:|:-----:|
+| amazon_side_asn | The Autonomous System Number (ASN) for the Amazon side of the gateway. If you don't specify an ASN, the virtual private gateway is created with the default ASN. | string | `` | no |
 | assign_generated_ipv6_cidr_block | Requests an Amazon-provided IPv6 CIDR block with a /56 prefix length for the VPC. You cannot specify the range of IP addresses, or the size of the CIDR block | string | `false` | no |
 | azs | A list of availability zones in the region | string | `<list>` | no |
 | cidr | The CIDR block for the VPC. Default value is a valid CIDR, but not acceptable by AWS and should be overridden | string | `0.0.0.0/0` | no |

main.tf

@@ -421,7 +421,8 @@ resource "aws_route_table_association" "public" {
 resource "aws_vpn_gateway" "this" {
   count = "${var.create_vpc && var.enable_vpn_gateway ? 1 : 0}"
 
-  vpc_id = "${aws_vpc.this.id}"
+  vpc_id          = "${aws_vpc.this.id}"
+  amazon_side_asn = "${var.amazon_side_asn}"
 
   tags = "${merge(map("Name", format("%s", var.name)), var.vpn_gateway_tags, var.tags)}"
 }

variables.tf

@@ -143,6 +143,11 @@ variable "vpn_gateway_id" {
   default     = ""
 }
 
+variable "amazon_side_asn" {
+  description = "The Autonomous System Number (ASN) for the Amazon side of the gateway. If you don't specify an ASN, the virtual private gateway is created with the default ASN."
+  default     = ""                                                                                                                                                                 # Error: module.vpc.aws_vpn_gateway.this: "amazon_side_asn" ("") must be a 64-bit integer
+}
+
 variable "propagate_private_route_tables_vgw" {
   description = "Should be true if you want route table propagation"
   default     = false