howto: find nat gateway for a given subnet?

[hashibot]

This issue was originally opened by @larsrnielsen as hashicorp/terraform#14888. It was migrated here as a result of the provider split. The original body of the issue is below.

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Hi,

I am creating subnets and nat gateways with EIPs as per defined by list variables. But how do I find the aws_nat_gateway for a given subnet? I couldn't find a data provider for it and the one for subnet didn't provide an access to this information.

Lars

resource "aws_nat_gateway" "nat" {
  allocation_id = "${element(aws_eip.nat.*.id, count.index)}"
  subnet_id = "${element(aws_subnet.public.*.id, count.index)}"
  count = "${var.nat_gateway_count}"
  depends_on = [
    "aws_internet_gateway.igw"]
}

resource "aws_route" "private_nat_route" {
  route_table_id = "${element(aws_route_table.private.*.id, count.index)}"
  count = "${(var.nat_gateway_count > 0 ? 1 : 0) * length(compact(split(",", var.private_subnets)))}"
  destination_cidr_block = "0.0.0.0/0"
  nat_gateway_id = "?????"
}

[ewbankkit]

aws_nat_gateway data source added via #1294 has a filter on subnet_id.

[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!