Unable to Create CNAME Record using Route53 with Terraform

[dfroehli]

Running Terraform 0.11.14 with AWS provider version 2.58.

Was able to create a Hosted Zone, SOA, NS and A records but the plan failed trying to create the CNAME record with:

• aws_route53_record.crec: aws_route53_record.crec: diffs didn't match during apply. This is a bug with Terraform and should be reported as a GitHub Issue.

Please include the following information in your report:

Terraform Version: 0.11.14
Resource ID: aws_route53_record.crec
Mismatch reason: attribute mismatch: records.3355949224
Diff One (usually from plan): *terraform.InstanceDiff{mu:sync.Mutex{state:0, sema:0x0}, Attributes:map[string]*terraform.ResourceAttrDiff{"allow_overwrite":*terraform.ResourceAttrDiff{Old:"", New:"", NewComputed:true, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "fqdn":*terraform.ResourceAttrDiff{Old:"", New:"", NewComputed:true, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "name":*terraform.ResourceAttrDiff{Old:"", New:"www.poseidon-project.servers.net", NewComputed:false, NewRemoved:false, NewExtra:"www.poseidon-project.servers.net", RequiresNew:true, Sensitive:false, Type:0x0}, "records.#":*terraform.ResourceAttrDiff{Old:"", New:"1", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "records.3355949224":*terraform.ResourceAttrDiff{Old:"", New:"poseidon-project.servers.net", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "ttl":*terraform.ResourceAttrDiff{Old:"", New:"300", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "type":*terraform.ResourceAttrDiff{Old:"", New:"CNAME", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "zone_id":*terraform.ResourceAttrDiff{Old:"", New:"${aws_route53_zone.domain_zone.zone_id}", NewComputed:true, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:true, Sensitive:false, Type:0x0}}, Destroy:false, DestroyDeposed:false, DestroyTainted:false, Meta:map[string]interface {}(nil)}
Diff Two (usually from apply): *terraform.InstanceDiff{mu:sync.Mutex{state:0, sema:0x0}, Attributes:map[string]*terraform.ResourceAttrDiff{"allow_overwrite":*terraform.ResourceAttrDiff{Old:"", New:"", NewComputed:true, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "fqdn":*terraform.ResourceAttrDiff{Old:"", New:"", NewComputed:true, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "name":*terraform.ResourceAttrDiff{Old:"", New:"www.poseidon-project.servers.net", NewComputed:false, NewRemoved:false, NewExtra:"www.poseidon-project.servers.net.", RequiresNew:true, Sensitive:false, Type:0x0}, "records.#":*terraform.ResourceAttrDiff{Old:"", New:"1", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "records.3591491104":*terraform.ResourceAttrDiff{Old:"", New:"poseidon-project.servers.net.", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "ttl":*terraform.ResourceAttrDiff{Old:"", New:"300", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "type":*terraform.ResourceAttrDiff{Old:"", New:"CNAME", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:false, Sensitive:false, Type:0x0}, "zone_id":*terraform.ResourceAttrDiff{Old:"", New:"Z02226091OUGHYLPJ3C74", NewComputed:false, NewRemoved:false, NewExtra:interface {}(nil), RequiresNew:true, Sensitive:false, Type:0x0}}, Destroy:false, DestroyDeposed:false, DestroyTainted:false, Meta:map[string]interface {}(nil)}

ROUTE53 Code.txt

However, when I ran an incremental execution plan, it added the CNAME record.

[anGie44]

Hi @dfroehli, thank you for submitting this.

From your logs it looks like the name attribute (referenced as aws_route53_zone.domain_zone.name in your TF config) with new trailing period is causing the diff:
poseidon-project.servers.net vs poseidon-project.servers.net.

We are anticipating the removal of all these trailing period workarounds via #13510 in the next major version of the Terraform AWS Provider 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!

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!