variable web_server_name {}
  resource "azurerm_network_interface" "web_server_nic" {
    name = "${var.web_server_name}-nic"
    location = var.web_server_location
    resource_group_name = azurerm_resource_group.web_server_rg.name
    
    ip_configuration {
      name = "${var.web_server_name}-ip"
      subnet_id = azurerm_subnet.web_server_subnet.id
      private_ip_address_allocation = "dynamic" 
    }
  }