Create DNS records for preview environments

Author: lamroger-nava

infra/modules/service/dns.tf

@@ -1,9 +1,8 @@
 locals {
-  domain_name = !var.is_temporary && var.domain_name != null ? var.domain_name : null
+  domain_name = var.domain_name
 }
 
 resource "aws_route53_record" "app" {
-  # Don't create DNS record for temporary environments (e.g. ones spun up by CI/)
   count = local.domain_name != null && var.hosted_zone_id != null ? 1 : 0
 
   name    = local.domain_name

infra/{{app_name}}/service/domain.tf

@@ -1,5 +1,10 @@
 locals {
   domain_config = local.environment_config.domain_config
+
+  # For preview (temporary) environments, construct a domain name from the
+  # workspace ID and service name so each preview gets a unique subdomain.
+  # e.g. "pr-42.my-service.example.com"
+  service_domain_name = local.is_temporary ? "${terraform.workspace}.${local.service_config.service_name}.${local.domain_config.hosted_zone}" : module.domain.domain_name
 }
 
 module "domain" {

infra/{{app_name}}/service/main.tf

@@ -66,7 +66,7 @@ module "service" {
   network_name = local.environment_config.network_name
   project_name = module.project_config.project_name
 
-  domain_name     = module.domain.domain_name
+  domain_name     = local.service_domain_name
   hosted_zone_id  = module.domain.hosted_zone_id
   certificate_arn = module.domain.certificate_arn