Tagging on default resources not supported aws_elasticache_subnet_group

[Luminoth]

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Terraform CLI and Terraform AWS Provider Version

Terraform v0.14.8

• provider registry.terraform.io/hashicorp/aws v3.38.0

Affected Resource(s)

• aws_elasticache_subnet_group

Terraform Configuration Files

Please include all Terraform configurations required to reproduce the bug. Bug reports without a functional reproduction may be closed without investigation.

provider "aws" {
  region  = var.region
  profile = var.profile

  default_tags {
    tags = {
      Name = "terraform-default"
    }
  }
}

resource "aws_elasticache_subnet_group" "default" {
  name        = "default"
  description = "Default CacheSubnetGroup"
  subnet_ids  = data.aws_subnet_ids.public.ids
}

Expected Behavior

I would expect Terraform to skip applying default tags to resources that can't have them.

Actual Behavior

Error: error updating tags: error tagging resource (arn:aws:elasticache:[snip]:subnetgroup:default): InvalidParameterValue: Tagging on default resources is not supported

in resource "aws_elasticache_subnet_group" "default":
resource "aws_elasticache_subnet_group" "default" {

Steps to Reproduce

1. terraform apply

Related:

• F/resource aws elasticache subnet group: Support Tags #19119
• Default tags for all resources #7926

[anGie44]

Hi @Luminoth, thank you for reporting this! In the meantime I believe adding a lifecycle config block to your existing config should prevent changes being detected; however, if you're creating the resource from scratch, the workaround is not applicable. In this case, the attribute to ignore is tags_all as it represents provider-level tags + resource-tags (if any) instead of tags which in this case is an empty map e.g.

resource "aws_elasticache_subnet_group" "default" {
  name        = "default"
  description = "Default CacheSubnetGroup"
  subnet_ids  = data.aws_subnet_ids.public.ids

  lifecycle {
    ignore_changes = [tags_all["Name"]] # or more generally just tags_all since this resource won't have resource-level tags
  }
}

[Luminoth]

That workaround worked perfectly. Thank you!

[ghost]

This has been released in version 3.42.0 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!

[github-actions]

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