Resource aws_vpc_dhcp_options should trim trailing . from domain_name

[rlees85]

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Terraform Version

• Terraform v0.11.7
• AWS Provider 2.0.0

Affected Resource(s)

• aws_vpc_dhcp_options

Terraform Configuration Files

resource "aws_vpc_dhcp_options" "scope" {
  domain_name         =   "${coalesce(join("", aws_route53_zone.private.*.name), format("%v.%v", data.aws_region.scope.name, var.dhcp_options_domain_fallback_suffix))}"
  domain_name_servers = [ "${var.dhcp_options_dns_servers                                                                                                             }" ]

  tags {
    VPC    = "${var.name                                                                                                                                }"
    Name   = "${var.name}-${var.dhcp_options_name                                                                                                       }"
    Owner  = "${var.owner                                                                                                                               }"
    Domain = "${coalesce(join("", aws_route53_zone.private.*.name), format("%v.%v", data.aws_region.scope.name,var.dhcp_options_domain_fallback_suffix))}"
    Region = "${data.aws_region.scope.name                                                                                                              }"
  }
}

Debug Output

n/a

Panic Output

n/a

Expected Behavior

The output of the route53_zone name to be accepted into the domain_name for DHCP options.

Actual Behavior

There is now a trailing dot, that the DHCP option set resource accepts but breaks all DHCP clients.

Similar:
#6535
#6389

Steps to Reproduce

1. terraform apply

Important Factoids

References

• #0000

[jeffery]

Hi @rlees85 Did you manage to get a workaround for the manipulation of the end dot in the var.dhcp_options_dns_servers list?

[rlees85]

Its domain_name I had issues with, I was trying to use the output of route53_zone directly in this field. For now I am using something like:

replace(join("", aws_route53_zone.private.*.name), "/\\.$/", "")

With is a simple regex that removes any . if and only if it is at the end of the string.

[anGie44]

Hi @rlees85, thanks again for creating this issue! With the proposed changes in #14220 to remove the trailing period in Route53 Zone resources, resources like aws_vpc_dhcp_options should behave as expected when using the name attribute of the aws_route53_zone resource as input to domain_name. The bug-fix will land in the upcoming Provider release of v3.0.0 😃

This has been released in version 3.0.0 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!

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