Creating a Route53 entry for RDS using Terraform - mysql

Question

I am attempting to create a Route53 entry for a MySQL RDS instance but having issues with the :3306 at the end of the RDS endpoint returned from Terraform.
resource "aws_db_instance" "mydb" {
allocated_storage = 10
engine = "mysql"
engine_version = "5.6.17"
instance_class = "db.t2.micro"
name = "mydb"
username = "foo"
password = "bar"
db_subnet_group_name = "my_database_subnet_group"
parameter_group_name = "default.mysql5.6"
}
resource "aws_route53_record" "database" {
zone_id = "${aws_route53_zone.primary.zone_id}"
name = "database.example.com"
type = "CNAME"
ttl = "300"
records = ["${aws_db_instance.default.endpoint}"]
}
Terraform puts a :3306 at the end of the endpoint and that gets entered into the Route53 Value of the CNAME.
When I then try to connect to the CNAME database.example.com with the MySQL client I get:
ERROR 2005 (HY000): Unknown MySQL server host 'database.example.com' (0)
Once I remove the :3306 via the AWS route53 console It seems work just fine.
Question is: How do I strip the :3306 from the Terraform RDS endpoint

Answer 1

As well as an endpoint output, Terraform's aws_db_instance resource also outputs address that provides the FQDN of the instance.
So all you need to do is change your aws_route53_record resource to use address instead:
resource "aws_db_instance" "mydb" {
allocated_storage = 10
engine = "mysql"
engine_version = "5.6.17"
instance_class = "db.t2.micro"
name = "mydb"
username = "foo"
password = "bar"
db_subnet_group_name = "my_database_subnet_group"
parameter_group_name = "default.mysql5.6"
}
resource "aws_route53_record" "database" {
zone_id = "${aws_route53_zone.primary.zone_id}"
name = "database.example.com"
type = "CNAME"
ttl = "300"
records = ["${aws_db_instance.mydb.address}"]
}