Question

You maintain a reusable module named 'network' that provisions a VPC and subnets. In your root configuration, you write `subnet_id = module.network.private_subnet_id`, but `terraform plan` fails with an error saying the module has no output named 'private_subnet_id'. The subnet resource clearly exists inside the module's files. What is the correct fix?

Accepted Answer

Add an `output "private_subnet_id"` block inside the network module that references the subnet resource's attribute

Answer

Add a `variable "private_subnet_id"` block to the root module so the value can be passed in

Answer

Reference the resource directly with `module.network.aws_subnet.private.id` instead of using an output

Answer

Run `terraform init` again so the module's internal resource attributes become accessible to the root module