How to Use Terraform with Existing Infrastructure

Using Terraform with existing infrastructure.

Add the existing resource to your Terraform file:

resource "aws_route53_zone" "primary_zone" {
    name = var.root_domain
}

Then run aws cli command to get the ID:

terraform import aws_route53_zone.primary_zone <resource id>

This adds the resource to your state file, as if it had been managed by Terraform all along.

References

Import: Usage | Terraform | HashiCorp Developer