Smart DNS: Auto-Detecting Route53 Records in Terraform Every Route53 record in plain Terraform means a zone lookup, an explicit type, and for load balancers - a separate data source just to wire the alias. data "aws_route53_zone" "this" { name = "api.example.com." } data "aws_lb" "api" { name = "api-nlb" } resource "aws_route53_record" "api" { zone_id = data . aws_route53_zone . this . zone_id name = "api.example.com" type = "A" alias { name = data . aws_lb . api . dns_name zone_id = data . aws_lb . api . zone_id evaluate_target_health = true } } Enter fullscreen mode Exit fullscreen mode With a module that infers everything, the same record becomes: inputs = { name = "api.example.com" records = "api-nlb-1234567890.elb.eu-west-1.amazonaws.com" } Enter fullscreen mode Exit fullscreen mode zone auto-detection name = "api.example.com" │ └─ strip first label │ ▼ "example.com" ──► aws_route53_zone lookup Enter fullscreen mode Exit fullscreen mode The module splits the FQDN, drops the first label, queries Route53…