Default subnet not found

Question

When I run terraform apply with the resource:

 resource "aws_default_subnet" "my_az_default_subnet" { availability_zone = "eu-north-1" }

I get the error:

aws_default_subnet.learntf_default_subnet: Creating... Error: Default subnet not found

even if the default VPC and subnet exists in the specified availability_zone "eu-north-1".

provider.tf:

provider "aws" { access_key = var.aws_access_key secret_key = var.aws_secret_key region = "eu-north-1" }

variables.tf:

variable "aws_access_key" {} variable "aws_secret_key" {}

network.tf:

resource "aws_default_subnet" "learntf_default_subnet" { availability_zone = "eu-north-1" }

Are you saying the default subnet exists before or after the apply? — Matthew Schuchard
– Matthew Schuchard, Commented Apr 10, 2020 at 11:34
According to the documentation: docs.aws.amazon.com/vpc/latest/userguide/…, you can only have on default subnet per AZ, so this would definitely fail. Is your issue that the error message is not as clear as you would like? — Matthew Schuchard
– Matthew Schuchard, Commented Apr 10, 2020 at 12:48
According to terraform documentation: "The aws_default_subnet behaves differently from normal resources, in that Terraform does not create this resource, but instead "adopts" it into management." (terraform.io/docs/providers/aws/r/default_subnet.html) So I would expect terraform to apply the specified resource, with no error, without creating it, and adopting it into management. — Matteo Mazzanti
– Matteo Mazzanti, Commented Apr 10, 2020 at 13:01

Matteo Mazzanti · Accepted Answer · 2020-04-10 14:36:25Z

3

My mistake. It worked with.

resource "aws_default_subnet" "def_subnet" { availability_zone = "eu-north-1a" }

answered Apr 10, 2020 at 14:36

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