Issue creating a RDS Postregsql instance, with AWS Terraform module - postgresql

Question

I am attempting to run this module: https://registry.terraform.io/modules/azavea/postgresql-rds/aws/latest Here is the main.tf file created based on the information found there:
provider "aws" {
region = "us-east-2"
access_key = "key_here"
secret_key = "key_here"
}
module postgresql_rds {
source = "github.com/azavea/terraform-aws-postgresql-rds"
vpc_id = "vpc-2470994d"
instance_type = "db.t3.micro"
database_name = "tyler"
database_username = "admin"
database_password = "admin1234"
subnet_group = "tyler-subnet-1"
project = "Postgres-ts"
environment = "Staging"
alarm_actions = ["arn:aws:sns:us-east-2:304831784377:tyler-test"]
ok_actions = ["arn:aws:sns:us-east-2:304831784377:tyler-test"]
insufficient_data_actions = ["arn:aws:sns:us-east-2:304831784377:tyler-test"]
database_identifier = "jl23kj32sdf"
}
I am getting an error:
Error: Error creating DB Instance: DBSubnetGroupNotFoundFault: DBSubnetGroup 'tyler-subnet-1' not found.
│ status code: 404, request id: a95975dd-5456-444a-8f64-440fc4c1782f
│
│ with module.postgresql_rds.aws_db_instance.postgresql,
│ on .terraform/modules/postgresql_rds/main.tf line 46, in resource "aws_db_instance" "postgresql":
│ 46: resource "aws_db_instance" "postgresql" {
I have tried the example from the page:
subnet_group = aws_db_subnet_group.default.name
I used the default example from the page, under "Usage" ie subnet_group = aws_db_subnet_group.default.name. I have also used the subnet ID from AWS. I also assigned a name to the subnet, and used the name "tyler-subnet-1 in the above main.tf). I am getting the same basic error, with all three attempted inputs. Is there something I'm not understanding about the information that is being requested here?

Answer 1

Assuming you have a default subnet group, you can just use it:
subnet_group = "default"
If not you have to create a custom subnet group using aws_db_subnet_group:
resource "aws_db_subnet_group" "default" {
name = "my-subnet-group"
subnet_ids = [<subnet-id-1>, <subnet-id-2>]
tags = {
Name = "My DB subnet group"
}
}
and use the custom group:
subnet_group = aws_db_subnet_group.default.name