Feature/wireguard subnet (#23)

* Output WireGuard interface address

* Output wireguard_interface_address

* terraform-docs: automated action

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

terraform-aws-wireguard/README.md

@@ -49,10 +49,24 @@ module "wireguard" {
 
   wireguard_interface_private_key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=" # Treat this value as sensitive
   wireguard_peer_public_key       = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=" # Treat this value as sensitive
-  wireguard_peer_source_ip        = "X.X.X.X/32" # Treat this value as sensitive
+  wireguard_peer_source_ip        = "x.x.x.x/32" # Treat this value as sensitive
 
   tags = local.tags
 }
+
+# Define list of all route tables in selected VPC to route to WireGuard instance 
+locals {
+  route_table_ids = ["rtb-xxxxxxxxxxxxxxxxx", "rtb-yyyyyyyyyyyyyyyyy"] # one or more route table IDs
+}
+
+# Create route(s) to WireGuard instance ENI in root table(s)
+resource "aws_route" "wireguard_instance" {
+  for_each = toset(local.route_table_ids)
+
+  route_table_id         = each.value
+  destination_cidr_block = module.wireguard.wireguard_interface_address
+  network_interface_id   = module.wireguard.aws_network_interface.id
+}
 ```
 
 <!-- BEGIN_TF_DOCS -->
@@ -121,6 +135,7 @@ No modules.
 | <a name="output_launch_template"></a> [launch\_template](#output\_launch\_template) | Launch template of NAT instance |
 | <a name="output_network_interface"></a> [network\_interface](#output\_network\_interface) | Network interface of WireGuard interface instance |
 | <a name="output_security_group"></a> [security\_group](#output\_security\_group) | Security group of WireGuard interface instance |
+| <a name="output_wireguard_interface_address"></a> [wireguard\_interface\_address](#output\_wireguard\_interface\_address) | WireGuard interface address |
 <!-- END_TF_DOCS -->
 
 ## Note

terraform-aws-wireguard/output.tf

@@ -26,4 +26,9 @@ output "launch_template" {
 output "autoscaling_group" {
   value       = aws_autoscaling_group.this
   description = "Autoscaling group of NAT instance"
+}
+
+output "wireguard_interface_address" {
+  value       = var.wireguard_interface_address
+  description = "WireGuard interface address"
 }