Can not change target type on existing aws_route

[RomanSaveljev]

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Terraform Version

Terraform v0.12.24
+ provider.aws v2.55.0
+ provider.github v2.5.1

Affected Resource(s)

• aws_route

Terraform Configuration Files

provider "aws" {
  region      = "eu-west-1"
  max_retries = 10
}

provider "github" {
  anonymous = true
  individual = true
}

//data "github_ip_ranges" "github" {}

resource "aws_vpc" "vpc" {
  cidr_block = "10.200.0.0/16"
}

resource "aws_route_table" "route_table" {
  vpc_id = aws_vpc.vpc.id
}

resource "aws_subnet" "public" {
  vpc_id                          = aws_vpc.vpc.id
  cidr_block                      = "10.200.0.0/22"
  map_public_ip_on_launch         = true
}

resource "aws_internet_gateway" "internet" {
  vpc_id = aws_vpc.vpc.id
}

resource "aws_eip" "eip" {}

resource "aws_nat_gateway" "nat" {
  allocation_id = aws_eip.eip.id
  subnet_id     = aws_subnet.public.id
}

resource "aws_route" "git" {
  route_table_id         = aws_route_table.route_table.id
  destination_cidr_block = "8.8.8.8/32"
  //gateway_id             = aws_internet_gateway.internet.id
  nat_gateway_id         = aws_nat_gateway.nat.id
}

Debug Output

https://gist.github.com/RomanSaveljev/0d5f4ca81c0d343cf79418ae6e2c8ac3

Panic Output

Expected Behavior

• Changing route target from IGW to NAT succeeds

Actual Behavior

• terraform apply fails

Steps to Reproduce

• Take embedded HCL and comment nat_gateway_id and uncomment gateway_id
• terraform apply to bring the infrastructure up
• Comment gateway_id and uncomment nat_gateway_id
• terraform apply to change route target

Important Factoids

References

[ewbankkit]

Related:

• [BUG] aws_route with conditional target to use nat_gateway_id or transit_gateway_id #13079
• [BUG] Cannot replace Virtual Private Gateway route with Transit Gateway route in aws_route resource #13302
• aws_route Error: more than 1 targe specified if you change the destination type #684

[ghost]

This has been released in version 3.34.0 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!