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feat: Allow specifying additional TGW routes in attached VPCs #132

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feat: Allow specifying additional TGW routes in attached VPCs #132

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5 changes: 3 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -68,7 +68,7 @@ module "vpc" {

| Name | Version |
|------|---------|
| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.13.1 |
| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.1 |
| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 4.4 |

## Providers
Expand Down Expand Up @@ -96,7 +96,8 @@ No modules.
| [aws_ram_resource_association.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ram_resource_association) | resource |
| [aws_ram_resource_share.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ram_resource_share) | resource |
| [aws_ram_resource_share_accepter.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ram_resource_share_accepter) | resource |
| [aws_route.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route) | resource |
| [aws_route.additional_cidrs](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route) | resource |
| [aws_route.destination_cidr](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route) | resource |

## Inputs

Expand Down
3 changes: 2 additions & 1 deletion examples/multi-account/main.tf
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Expand Up @@ -105,7 +105,8 @@ module "tgw_peer" {
transit_gateway_default_route_table_propagation = false

vpc_route_table_ids = module.vpc1.private_route_table_ids
tgw_destination_cidr = "0.0.0.0/0"
tgw_destination_cidr = "10.0.0.0/8"
tgw_additional_cidrs = ["172.0.0/12"]

tgw_routes = [
{
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32 changes: 31 additions & 1 deletion main.tf
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Expand Up @@ -19,6 +19,18 @@ locals {
}
]
])

vpc_route_table_additional_cidrs = flatten([
for k, v in var.vpc_attachments : [
for rtb_id in try(v.vpc_route_table_ids, []) : [
for cidr in try(v.tgw_additional_cidrs, []) : {
rtb_id = rtb_id
cidr = cidr
tgw_id = var.create_tgw ? aws_ec2_transit_gateway.this[0].id : v.tgw_id
}
]
]
])
}

################################################################################
Expand Down Expand Up @@ -112,7 +124,7 @@ resource "aws_ec2_transit_gateway_route" "this" {
transit_gateway_attachment_id = tobool(try(local.vpc_attachments_with_routes[count.index][1].blackhole, false)) == false ? aws_ec2_transit_gateway_vpc_attachment.this[local.vpc_attachments_with_routes[count.index][0].key].id : null
}

resource "aws_route" "this" {
resource "aws_route" "destination_cidr" {
for_each = { for x in local.vpc_route_table_destination_cidr : x.rtb_id => {
cidr = x.cidr,
tgw_id = x.tgw_id
Expand All @@ -124,6 +136,24 @@ resource "aws_route" "this" {
transit_gateway_id = each.value["tgw_id"]
}

moved {
from = aws_route.this
to = aws_route.destination_cidr
}

resource "aws_route" "additional_cidrs" {
for_each = { for x in local.vpc_route_table_additional_cidrs : "${x.rtb_id}_${x.cidr}" => {
cidr = x.cidr
rtb_id = x.rtb_id
tgw_id = x.tgw_id
} }

route_table_id = each.value["rtb_id"]
destination_cidr_block = try(each.value.ipv6_support, false) ? null : each.value["cidr"]
destination_ipv6_cidr_block = try(each.value.ipv6_support, false) ? each.value["cidr"] : null
transit_gateway_id = each.value["tgw_id"]
}

resource "aws_ec2_transit_gateway_route_table_association" "this" {
for_each = {
for k, v in var.vpc_attachments : k => v if var.create_tgw && var.create_tgw_routes && try(v.transit_gateway_default_route_table_association, true) != true
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2 changes: 1 addition & 1 deletion versions.tf
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@@ -1,5 +1,5 @@
terraform {
required_version = ">= 0.13.1"
required_version = ">= 1.1"

required_providers {
aws = {
Expand Down