Incorporate review feedback

quickstart/101-managed-lustre-create-filesystem/main.tf

@@ -1,26 +1,54 @@
-resource "azurerm_resource_group" "example" { 
-  name = "${random_pet.prefix.id}-rg"
-  location = var.rg_location
+resource "random_pet" "rg_name" {
+  prefix = var.resource_group_name_prefix
+}
+
+resource "azurerm_resource_group" "rg" { 
+  name = "${random_pet.rg_name.id}"
+  location = var.resource_group_location
+}
+
+resource "random_string" "azurerm_virtual_network_name" {
+  length  = 13
+  lower   = true
+  numeric = false
+  special = false
+  upper   = false
 }
 
 resource "azurerm_virtual_network" "example" { 
-  name = "${random_pet.prefix.id}-vnet"
-  resource_group_name = azurerm_resource_group.example.name
+  name = coalesce(var.virtual_network_name, "vnet-${random_string.azurerm_virtual_network_name.result}")
+  resource_group_name = azurerm_resource_group.rg.name
   address_space = ["10.0.0.0/16"] 
-  location = azurerm_resource_group.example.location 
+  location = azurerm_resource_group.rg.location 
+}
+
+resource "random_string" "azurerm_subnet_name" {
+  length  = 13
+  lower   = true
+  numeric = false
+  special = false
+  upper   = false
 }
 
 resource "azurerm_subnet" "example" { 
-  name = "${random_pet.prefix.id}-subnet"
-  resource_group_name = azurerm_resource_group.example.name 
+  name = coalesce(var.subnet_name, "subnet-${random_string.azurerm_subnet_name.result}")
+  resource_group_name = azurerm_resource_group.rg.name 
   virtual_network_name = azurerm_virtual_network.example.name 
   address_prefixes = ["10.0.2.0/24"]
 }
 
+resource "random_string" "azurerm_amlfs_name" {
+  length  = 13
+  lower   = true
+  numeric = false
+  special = false
+  upper   = false
+}
+
 resource "azurerm_managed_lustre_file_system" "example" { 
-  name = "${random_pet.prefix.id}"
-  resource_group_name = azurerm_resource_group.example.name
-  location = azurerm_resource_group.example.location 
+  name = coalesce(var.amlfs_name, "amlfs-${random_string.azurerm_amlfs_name.result}")
+  resource_group_name = azurerm_resource_group.rg.name
+  location = azurerm_resource_group.rg.location 
   sku_name = var.amlfs_sku_name
   subnet_id = azurerm_subnet.example.id 
   storage_capacity_in_tb = var.amlfs_storage_capacity_in_tb 
@@ -29,9 +57,4 @@ resource "azurerm_managed_lustre_file_system" "example" {
     day_of_week = var.amlfs_maintenance_day_of_week
     time_of_day_in_utc = var.amlfs_maintenance_time_of_day
   }
-}
-
-resource "random_pet" "prefix" {
-  prefix = var.prefix
-  length = 1
 }