Using create_multiple_public_route_tables = true only creates an internet gateway route on one route table.

[dancashTT]

Description

When using the create_multiple_public_route_tables option, it creates separate route tables as needed, but only the first one has a route to the internet gateway on 0.0.0.0/0.

• ✋ I have searched the open/closed issues and my issue is not listed.

Versions

• Module version [Required]: 5.8.1

• Terraform version:

Terraform v1.8.4
on windows_386

• Provider version(s):

hashicorp/aws v5.42.0

Reproduction Code [Required]

provider "aws" {
  region = "us-west-1"
}

data "aws_availability_zones" "available" {}


module "vpc" {
  source = "terraform-aws-modules/vpc/aws"

  name = "vpctest"
  cidr = "10.0.0.0/16"

  azs              = ["us-west-1a", "us-west-1c"]
  private_subnets  = ["10.0.16.0/20", "10.0.32.0/20"]
  public_subnets   = ["10.0.64.0/20", "10.0.80.0/20"]
  database_subnets = ["10.0.112.0/20", "10.0.128.0/20"]
  intra_subnets    = ["10.0.0.0/24", "10.0.1.0/24"]

  create_database_subnet_route_table  = true
  create_multiple_intra_route_tables  = true
  create_multiple_public_route_tables = true

  enable_nat_gateway     = true
  single_nat_gateway     = false
  one_nat_gateway_per_az = true
  create_igw             = true

  tags = {
    Terraform   = "true"
    Environment = "poc"
  }
}

data "aws_route_table" "public" {
  count     = length(module.vpc.public_subnets)
  subnet_id = module.vpc.public_subnets[count.index]
}

output "public_routes" {
  value = data.aws_route_table.public
}

Steps to reproduce the behavior:

terraform init
terraform apply

Expected behavior

I would expect the routes output to show a route for 0.0.0.0/0 to the IGW.

Actual behavior

Only 1 route table has the 0.0.0.0/0 route to the IGW

Terminal Output Screenshot(s)

public_routes = [
  {
    "arn" = "arn:aws:ec2:us-west-1:123456789012:route-table/rtb-02ddf93e5022dfa74"
    "associations" = tolist([
      {
        "gateway_id" = ""
        "main" = false
        "route_table_association_id" = "rtbassoc-04dbbd3aa1ace4a29"
        "route_table_id" = "rtb-02ddf93e5022dfa74"
        "subnet_id" = "subnet-0ec0bbe2b9a39f30e"
      },
    ])
    "filter" = toset(null) /* of object */
    "gateway_id" = tostring(null)
    "id" = "rtb-02ddf93e5022dfa74"
    "owner_id" = "123456789012"
    "route_table_id" = "rtb-02ddf93e5022dfa74"
    "routes" = tolist([
      {
        "carrier_gateway_id" = ""
        "cidr_block" = "0.0.0.0/0"
        "core_network_arn" = ""
        "destination_prefix_list_id" = ""
        "egress_only_gateway_id" = ""
        "gateway_id" = "igw-0a6db78b89f50fb4a"
        "instance_id" = ""
        "ipv6_cidr_block" = ""
        "local_gateway_id" = ""
        "nat_gateway_id" = ""
        "network_interface_id" = ""
        "transit_gateway_id" = ""
        "vpc_endpoint_id" = ""
        "vpc_peering_connection_id" = ""
      },
    ])
    "subnet_id" = "subnet-0ec0bbe2b9a39f30e"
    "tags" = tomap({
      "Environment" = "poc"
      "Name" = "cashvpc-public-us-west-1a"
      "Terraform" = "true"
    })
    "timeouts" = null /* object */
    "vpc_id" = "vpc-029910e17bdb25c18"
  },
  {
    "arn" = "arn:aws:ec2:us-west-1:123456789012:route-table/rtb-0e4d30ed4c5657754"
    "associations" = tolist([
      {
        "gateway_id" = ""
        "main" = false
        "route_table_association_id" = "rtbassoc-0eb33bfc893c518c6"
        "route_table_id" = "rtb-0e4d30ed4c5657754"
        "subnet_id" = "subnet-06b85da110feb7b6c"
      },
    ])
    "filter" = toset(null) /* of object */
    "gateway_id" = tostring(null)
    "id" = "rtb-0e4d30ed4c5657754"
    "owner_id" = "123456789012"
    "route_table_id" = "rtb-0e4d30ed4c5657754"
    "routes" = tolist([])
    "subnet_id" = "subnet-06b85da110feb7b6c"
    "tags" = tomap({
      "Environment" = "poc"
      "Name" = "cashvpc-public-us-west-1c"
      "Terraform" = "true"
    })
    "timeouts" = null /* object */
    "vpc_id" = "vpc-029910e17bdb25c18"
  },
]

[fedeostrit]

Good day, I have the same problem, a single route is created that is attached only to the first route-table, if you have "create_multiple_public_route_tables" activated, no more routes are generated for each of the Azs

@bryantbiggs Is there any PR designed to solve this problem?

[TroyMartens]

Would love to see this PR merged. Makes it hard to choose this module for HA architectures.

[antonbabenko]

This issue has been resolved in version 5.11.0 🎉

[github-actions]

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