In Terraform , how to refer to components created in root module in included modules

Question

The below sample is given to give an idea about the question.

I have a resource group and EventHubNS created in the root module of the Terraform script

I have another module , called processingmodule ,that has function, EventHub and few other aggregated components.

So the Root module is as below - Create Azure Resource Group Create EventHubNS Create processingModule

If the event hub was created in the root module, the eventhub resource is created using below resource block

resource "azurerm_eventhub" "eventhub" {
  name                = "${var.eventhubname}-eh"
  namespace_name      = azurerm_eventhub_namespace.eventhubns.name
  resource_group_name = azurerm_resource_group.RG.name
  partition_count     = var.eventhub_partitioncount
  message_retention   = 5
 
}

If I write the module, the namespace_name and resource_group_name cannot be referred as shown below

namespace_name      = azurerm_eventhub_namespace.eventhubns.name
resource_group_name = azurerm_resource_group.RG.name

Instead, the namespace_name should be referred through variable.

namespace_name      = var.eventhubnsname
resource_group_name = var.resourcegroupname

So question is - is there anyway to refer to the resources created in the root module from the processingcomponent module

Answer 1

Modules do not have access to resources in the parent, unless those resources are passed in as variables to the module.