Adding support for priority

azurerm/resource_arm_virtual_machine_scale_set.go

@@ -115,6 +115,12 @@ func resourceArmVirtualMachineScaleSet() *schema.Resource {
 				ForceNew: true,
 			},
 
+			"priority": {
+				Type:     schema.TypeString,
+				Optional: true,
+				ForceNew: true,
+			},
+
 			"os_profile": {
 				Type:     schema.TypeList,
 				Required: true,
@@ -672,6 +678,7 @@ func resourceArmVirtualMachineScaleSetCreate(d *schema.ResourceData, meta interf
 	updatePolicy := d.Get("upgrade_policy_mode").(string)
 	overprovision := d.Get("overprovision").(bool)
 	singlePlacementGroup := d.Get("single_placement_group").(bool)
+	priority := d.Get("priority").(string)
 
 	scaleSetProps := compute.VirtualMachineScaleSetProperties{
 		UpgradePolicy: &compute.UpgradePolicy{
@@ -682,6 +689,7 @@ func resourceArmVirtualMachineScaleSetCreate(d *schema.ResourceData, meta interf
 			StorageProfile:   &storageProfile,
 			OsProfile:        osProfile,
 			ExtensionProfile: extensions,
+			Priority:         compute.VirtualMachinePriorityTypes(priority),
 		},
 		Overprovision:        &overprovision,
 		SinglePlacementGroup: &singlePlacementGroup,
@@ -783,7 +791,7 @@ func resourceArmVirtualMachineScaleSetRead(d *schema.ResourceData, meta interfac
 		if upgradePolicy := properties.UpgradePolicy; upgradePolicy != nil {
 			d.Set("upgrade_policy_mode", upgradePolicy.Mode)
 		}
-
+	        d.Set("priority", properties.VirtualMachineProfile.Priority)
 		d.Set("overprovision", properties.Overprovision)
 		d.Set("single_placement_group", properties.SinglePlacementGroup)
 

azurerm/resource_arm_virtual_machine_scale_set_test.go

@@ -119,6 +119,26 @@ func TestAccAzureRMVirtualMachineScaleSet_basicDNSSettings(t *testing.T) {
 	})
 }
 
+func TestAccAzureRMVirtualMachineScaleSet_basicPriority(t *testing.T) {
+	resource_name := scaleSetResourceName
+	ri := acctest.RandInt()
+	config := testAccAzureRMVirtualMachineScaleSet_basicPriority(ri, testLocation())
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testCheckAzureRMVirtualMachineScaleSetDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: config,
+				Check: resource.ComposeTestCheckFunc(
+					testCheckAzureRMVirtualMachineScaleSetExists(resource_name),
+					resource.TestCheckResourceAttr(scaleSetResourceName, "priority", "Low"),
+				),
+			},
+		},
+	})
+}
+
 func TestAccAzureRMVirtualMachineScaleSet_bootDiagnostic(t *testing.T) {
 	ri := acctest.RandInt()
 	config := testAccAzureRMVirtualMachineScaleSet_bootDiagnostic(ri, testLocation())
@@ -1368,6 +1388,91 @@ resource "azurerm_virtual_machine_scale_set" "test" {
 `, rInt, location, rInt, rInt, rInt, rInt, rInt, rInt)
 }
 
+func testAccAzureRMVirtualMachineScaleSet_basicPriority(rInt int, location string) string {
+	return fmt.Sprintf(`
+resource "azurerm_resource_group" "test" {
+    name = "acctestRG-%d"
+    location = "%s"
+}
+
+resource "azurerm_virtual_network" "test" {
+    name = "acctvn-%d"
+    address_space = ["10.0.0.0/16"]
+    location = "${azurerm_resource_group.test.location}"
+    resource_group_name = "${azurerm_resource_group.test.name}"
+}
+
+resource "azurerm_subnet" "test" {
+    name = "acctsub-%d"
+    resource_group_name = "${azurerm_resource_group.test.name}"
+    virtual_network_name = "${azurerm_virtual_network.test.name}"
+    address_prefix = "10.0.2.0/24"
+}
+
+resource "azurerm_storage_account" "test" {
+	name                     = "accsa%d"
+	resource_group_name      = "${azurerm_resource_group.test.name}"
+	location                 = "${azurerm_resource_group.test.location}"
+	account_tier             = "Standard"
+	account_replication_type = "LRS"
+
+    tags {
+        environment = "staging"
+    }
+}
+
+resource "azurerm_storage_container" "test" {
+    name = "vhds"
+    resource_group_name = "${azurerm_resource_group.test.name}"
+    storage_account_name = "${azurerm_storage_account.test.name}"
+    container_access_type = "private"
+}
+
+resource "azurerm_virtual_machine_scale_set" "test" {
+  name = "acctvmss-%d"
+  location = "${azurerm_resource_group.test.location}"
+  resource_group_name = "${azurerm_resource_group.test.name}"
+  upgrade_policy_mode = "Manual"
+  priority = "Low"
+
+  sku {
+    name = "Standard_D4_v2"
+    tier = "Standard"
+    capacity = 2
+  }
+
+  os_profile {
+    computer_name_prefix = "testvm-%d"
+    admin_username = "myadmin"
+    admin_password = "Passwword1234"
+  }
+
+  network_profile {
+      name = "TestNetworkProfile-%d"
+      primary = true
+      ip_configuration {
+        name = "TestIPConfiguration"
+        subnet_id = "${azurerm_subnet.test.id}"
+      }
+  }
+
+  storage_profile_os_disk {
+    name = "osDiskProfile"
+    caching       = "ReadWrite"
+    create_option = "FromImage"
+    vhd_containers = ["${azurerm_storage_account.test.primary_blob_endpoint}${azurerm_storage_container.test.name}"]
+  }
+
+  storage_profile_image_reference {
+    publisher = "Canonical"
+    offer     = "UbuntuServer"
+    sku       = "16.04-LTS"
+    version   = "latest"
+  }
+}
+`, rInt, location, rInt, rInt, rInt, rInt, rInt, rInt)
+}
+
 func testAccAzureRMVirtualMachineScaleSet_bootDiagnostic(rInt int, location string) string {
 	return fmt.Sprintf(`
 resource "azurerm_resource_group" "test" {

website/docs/r/virtual_machine_scale_set.html.markdown

@@ -246,6 +246,8 @@ The following arguments are supported:
 * `sku` - (Required) A sku block as documented below.
 * `upgrade_policy_mode` - (Required) Specifies the mode of an upgrade to virtual machines in the scale set. Possible values, `Manual` or `Automatic`.
 * `overprovision` - (Optional) Specifies whether the virtual machine scale set should be overprovisioned.
+* `priority` - (Optional) Specifies the priority for the virtual machines in the scale set. Possible values include: `Regular`, `Low`. Default is `Regular`. Changing this forces a
+    new resource to be created. See [documentation](https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-use-low-priority)
 * `single_placement_group` - (Optional) Specifies whether the scale set is limited to a single placement group with a maximum size of 100 virtual machines. If set to false, managed disks must be used. Default is true. Changing this forces a
     new resource to be created. See [documentation](http://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-placement-groups) for more information.
 * `license_type` - (Optional, when a Windows machine) Specifies the Windows OS license type. If supplied, the only allowed values are `Windows_Client` and `Windows_Server`.