Again remove rdns so we can work before migration...

data.linode_domain.this.tf

@@ -0,0 +1,3 @@
+data "linode_domain" "this" {
+  domain = var.domain_name
+}

output.instance.tf

@@ -1,4 +1,3 @@
 output "instance" {
   value = linode_instance.this
 }
-

resource.linode_domain_record.this_ipv4.tf

@@ -0,0 +1,6 @@
+resource "linode_domain_record" "this_ipv4" {
+  domain_id   = data.linode_domain.this.id
+  name        = var.host_name
+  record_type = "A"
+  target      = linode_instance.this.ip_address
+}

resource.linode_domain_record.this_ipv6.tf

@@ -0,0 +1,6 @@
+resource "linode_domain_record" "this_ipv6" {
+  domain_id   = data.linode_domain.this.id
+  name        = var.host_name
+  record_type = "AAAA"
+  target      = element(split("/", linode_instance.this.ipv6), 0)
+}