Add Network Interface ID attribute to Database Migration Service resource

[bn-jswick]

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Description

When creating an Azure Database Migration Service instance, a network interface is created by Azure in the selected subnet. However, there is currently no straight forward way to identify the IP of the NIC within Terraform.

The properties json of the resource does provide the virtualNicId of this automatically created NIC. If this was available in the exported attributes, the ID could be passed to a network interface data source to get the assigned IP of the NIC.

Sample resource json:

{
    "properties": {
        "provisioningState": "Stopped",
        "virtualNicId": "/subscriptions/fxxx-xxx-xxx-xx/resourceGroups/example-rg/providers/Microsoft.Network/networkInterfaces/NIC-xxxxxx",
        "virtualSubnetId": "/subscriptions/xxx-xxx-xxx-xx/resourceGroups/example-rg/providers/Microsoft.Network/virtualNetworks/example-vnet/subnets/example-snet"
    },
    "etag": "xxxxxxxxxxx",
    "id": "/subscriptions/xxx-xxx-xxx-xx/resourceGroups/example-rg/providers/Microsoft.DataMigration/services/example-dms",
    "kind": "Cloud",
    "location": "eastus2",
    "name": "example-dms",
    "sku": {
        "name": "Premium_4vCores",
        "size": "4 vCores",
        "tier": "Premium"
    },
    "type": "Microsoft.DataMigration/services"
}

The purpose of this is so that can use the assigned IP of the DMS resource in a network security rule to permit traffic from the resource to required endpoints.

New or Affected Resource(s)/Data Source(s)

azurerm_database_migration_service

Potential Terraform Configuration

No response

References

https://learn.microsoft.com/en-us/cli/azure/dms?view=azure-cli-latest#az-dms-show