Add blackhole Attribute to aws_ec2_transit_gateway_route

[stockhausenj]

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Description

With the AWS API it's possible to declare a transit gateway route table route as a blackhole. Which means that traffic matching the route will be dropped.
API: https://docs.aws.amazon.com/cli/latest/reference/ec2/create-transit-gateway-route.html
If a route is a blackhole then the attribute transit_gateway_attachment_id is ignored.

New or Affected Resource(s)

• aws_ec2_transit_gateway_route

Potential Terraform Configuration

resource "aws_ec2_transit_gateway_route" "example" {
  destination_cidr_block              = "10.0.0.0/8"
  blackhole                                   = true
  transit_gateway_route_table_id = "${aws_ec2_transit_gateway.example.association_default_route_table_id}"
}

References

• #0000

[kellersyf]

I'm really surprised this isn't here already. Implementation should just be adding the blackhole flag and not setting the transit-gateway-attachment-id field.

Here's the AWS API reference for the feature.

I'm happy to provide any other information, although I unfortunately do not have any experience in Go. =\

[bflad]

A new blackhole argument for the aws_ec2_transit_gateway_route resource has been merged and will release with version 2.18.0 of the Terraform AWS Provider, likely in the next day. Thanks, @anouvel!

[bflad]

This has been released in version 2.18.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template for triage. Thanks!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!