Exhibit:
Root module configuration:
output "vnet_id" {
value = module.my_network.vnet_id
}
Error:
Error: Reference to undeclared output value
on main.tf line 12, in output "vnet_id":
12: value = module.my_network.vnet_id
You are using a networking module in your Terraform configuration with the name my_network. Your root module includes the configuration shown. When you run terraform validate, you get the error shown. Which option would successfully retrieve this value from your networking module?
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Correct Answer:
D
Rationale for Correct Answer: A parent/root module can only read values from a child module if the child module exports them via an output block. The error indicates vnet_id is not an exported output from module.my_network. Defining output 'vnet_id' { value = ... } inside the networking (child) module makes module.my_network.vnet_id valid.
Analysis of Incorrect Options (Distractors):
A: Incorrect---Terraform does not use module.<name>.outputs.<output>; module outputs are referenced directly as module.<name>.<output>.
B: Incorrect---variables are inputs to a module, not values exported from it.
C: Incorrect---missing the module. prefix and still uses an invalid .outputs path.
Key Concept: Module outputs are the contract for exposing child module values to the root/parent.
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