Let's list the data we need to pass to the module:
- Name of the application
- VPC ID
- Subnet ID
That should be sufficient for now. Update the module inside template.tf to look as follows:
module "mighty_trousers" {
source = "./modules/application"
vpc_id = "${aws_vpc.my_vpc.id}"
subnet_id = "${aws_subnet.public.id}"
name = "MightyTrousers"
} Passing data like this is not enough though. We need to define variables inside the module template. The thing is, our tempate.tf is a module itself, a special module named root module. That's what you saw on the last graph we drew--resources were coming from the root module. So, we were actually already using modules all this time, and every module, including the root module, can be configured with variables.