aws_route_table and aws_default_route_table don't work / crash

[DagrutCr]

Terraform Version

Terraform v0.12.31

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Terraform Configuration Files

variable "AWS_ACCESS_KEY" {
}
variable "AWS_SECRET_KEY" {
}
variable "AWS_REGION" {
}

provider "aws" {
  access_key = var.AWS_ACCESS_KEY
  secret_key = var.AWS_SECRET_KEY
  region     = var.AWS_REGION
}

resource "aws_vpc" "vpc" {
  cidr_block       = "192.168.0.0/16"
  instance_tenancy = "default"

  tags = {
    Name = "Test VPC"
  }
}

resource "aws_subnet" "subnet" {
  vpc_id            = aws_vpc.vpc.id
  cidr_block        = "192.168.0.0/16"
  availability_zone = "${var.AWS_REGION}a"

  tags = {
    Name = "Test Subnet"
  }
}

resource "aws_internet_gateway" "gw" {
  vpc_id = aws_vpc.vpc.id

  tags = {
    Name = "Test GW"
  }
}

resource "aws_default_route_table" "route_table" {
  default_route_table_id = aws_vpc.vpc.default_route_table_id

  route = [
    {
      cidr_block = "0.0.0.0/0"
      gateway_id = aws_internet_gateway.gw.id

      # Somehow these are required...
      ipv6_cidr_block            = null
      destination_prefix_list_id = null
      egress_only_gateway_id     = null
      gateway_id                 = null
      instance_id                = null
      nat_gateway_id             = null
      network_interface_id       = null
      transit_gateway_id         = null
      vpc_endpoint_id            = null
      vpc_peering_connection_id  = null
    }
  ]
}

Debug Output & Crash Output

See : https://gist.github.com/DagrutCr/8f4f654104e64fb5c3a97d9c8ae6500f

Expected Behavior

Create or update route tables properly...

Actual Behavior

Crash when attempting to create or edit a route table, default or not

Steps to Reproduce

1. terraform init
2. terraform apply -var AWS_REGION=eu-west-3 -var "AWS_ACCESS_KEY=$key" -var "AWS_SECRET_KEY=$secret" -auto-approve

Additional Context

I did not include an example for normal route tables because that is the exact same issue (requiring all variables to be set for each route, and then crashing because nothing is set, even if it is).

References

Issue initially posted here : https://github.com/hashicorp/terraform/issues/29643

[GPKyte]

I notice that gateway_id is set twice in this example.

[DagrutCr]

Indeed, I added these lines from a previous error message but anyway, with or without the second gateway_id line the issue is the same.

In my case I had to use the AWS API to configure it :-/ .

[justinretzolk]

Hey @DagrutCr 👋 I recently reverted a change to the documentation that I think might be applying to you here. You can see details about the pull request here: https://github.com/hashicorp/terraform-provider-aws/pull/21740. Can you update your configuration with that change in mind and see if that resolves your issue?

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