diff --git a/azurerm/resource_arm_container_group.go b/azurerm/resource_arm_container_group.go
index e16ba43a40dd..e5b4b9b68b3f 100755
--- a/azurerm/resource_arm_container_group.go
+++ b/azurerm/resource_arm_container_group.go
@@ -400,7 +400,7 @@ func resourceArmContainerGroup() *schema.Resource {
 
 									"log_type": {
 										Type:     schema.TypeString,
-										Required: true,
+										Optional: true,
 										ForceNew: true,
 										ValidateFunc: validation.StringInSlice([]string{
 											string(containerinstance.ContainerInsights),
@@ -1362,23 +1362,26 @@ func expandContainerGroupDiagnostics(input []interface{}) *containerinstance.Con
 
 	workspaceId := analyticsV["workspace_id"].(string)
 	workspaceKey := analyticsV["workspace_key"].(string)
-	logType := containerinstance.LogAnalyticsLogType(analyticsV["log_type"].(string))
 
-	metadataMap := analyticsV["metadata"].(map[string]interface{})
-	metadata := make(map[string]*string)
-	for k, v := range metadataMap {
-		strValue := v.(string)
-		metadata[k] = &strValue
+	logAnalytics := containerinstance.LogAnalytics{
+		WorkspaceID:  utils.String(workspaceId),
+		WorkspaceKey: utils.String(workspaceKey),
 	}
 
-	return &containerinstance.ContainerGroupDiagnostics{
-		LogAnalytics: &containerinstance.LogAnalytics{
-			WorkspaceID:  utils.String(workspaceId),
-			WorkspaceKey: utils.String(workspaceKey),
-			LogType:      logType,
-			Metadata:     metadata,
-		},
+	if logType := analyticsV["log_type"].(string); logType != "" {
+		logAnalytics.LogType = containerinstance.LogAnalyticsLogType(logType)
+
+		metadataMap := analyticsV["metadata"].(map[string]interface{})
+		metadata := make(map[string]*string)
+		for k, v := range metadataMap {
+			strValue := v.(string)
+			metadata[k] = &strValue
+		}
+
+		logAnalytics.Metadata = metadata
 	}
+
+	return &containerinstance.ContainerGroupDiagnostics{LogAnalytics: &logAnalytics}
 }
 
 func flattenContainerGroupDiagnostics(d *schema.ResourceData, input *containerinstance.ContainerGroupDiagnostics) []interface{} {
diff --git a/azurerm/resource_arm_container_group_test.go b/azurerm/resource_arm_container_group_test.go
index 1a83df3b6b20..31f81f0979db 100755
--- a/azurerm/resource_arm_container_group_test.go
+++ b/azurerm/resource_arm_container_group_test.go
@@ -181,6 +181,38 @@ func TestAccAzureRMContainerGroup_imageRegistryCredentialsUpdate(t *testing.T) {
 	})
 }
 
+func TestAccAzureRMContainerGroup_logTypeUnset(t *testing.T) {
+	resourceName := "azurerm_container_group.test"
+	ri := tf.AccRandTimeInt()
+	config := testAccAzureRMContainerGroup_logTypeUnset(ri, testLocation())
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testCheckAzureRMContainerGroupDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: config,
+				Check: resource.ComposeTestCheckFunc(
+					testCheckAzureRMContainerGroupExists(resourceName),
+					resource.TestCheckResourceAttr(resourceName, "diagnostics.0.log_analytics.#", "1"),
+					resource.TestCheckResourceAttr(resourceName, "diagnostics.0.log_analytics.0.log_type", ""),
+					resource.TestCheckResourceAttr(resourceName, "diagnostics.0.log_analytics.0.metadata.%", "0"),
+					resource.TestCheckResourceAttrSet(resourceName, "diagnostics.0.log_analytics.0.workspace_id"),
+					resource.TestCheckResourceAttrSet(resourceName, "diagnostics.0.log_analytics.0.workspace_key"),
+				),
+			},
+			{
+				ResourceName:      resourceName,
+				ImportState:       true,
+				ImportStateVerify: true,
+				ImportStateVerifyIgnore: []string{
+					"diagnostics.0.log_analytics.0.workspace_key",
+				},
+			},
+		},
+	})
+}
+
 func TestAccAzureRMContainerGroup_linuxBasic(t *testing.T) {
 	resourceName := "azurerm_container_group.test"
 	ri := tf.AccRandTimeInt()
@@ -747,6 +779,49 @@ resource "azurerm_container_group" "test" {
 `, ri, location, ri)
 }
 
+func testAccAzureRMContainerGroup_logTypeUnset(ri int, location string) string {
+	return fmt.Sprintf(`
+resource "azurerm_resource_group" "test" {
+  name     = "acctestRG-%d"
+  location = "%s"
+}
+
+resource "azurerm_log_analytics_workspace" "test" {
+  name                = "acctestLAW-%d"
+  location            = "${azurerm_resource_group.test.location}"
+  resource_group_name = "${azurerm_resource_group.test.name}"
+  sku                 = "PerGB2018"
+}
+
+resource "azurerm_container_group" "test" {
+  name                = "acctestcontainergroup-%d"
+  location            = "${azurerm_resource_group.test.location}"
+  resource_group_name = "${azurerm_resource_group.test.name}"
+  ip_address_type     = "public"
+  os_type             = "Linux"
+
+  container {
+    name   = "hw"
+    image  = "microsoft/aci-helloworld:latest"
+    cpu    = "0.5"
+    memory = "0.5"
+    port   = 80
+  }
+
+  diagnostics {
+    log_analytics {
+      workspace_id  = "${azurerm_log_analytics_workspace.test.workspace_id}"
+      workspace_key = "${azurerm_log_analytics_workspace.test.primary_shared_key}"
+    }
+  }
+
+  tags = {
+    environment = "Testing"
+  }
+}
+`, ri, location, ri, ri)
+}
+
 func testAccAzureRMContainerGroup_linuxBasicUpdated(ri int, location string) string {
 	return fmt.Sprintf(`
 resource "azurerm_resource_group" "test" {
diff --git a/website/docs/r/container_group.html.markdown b/website/docs/r/container_group.html.markdown
index f1ed8fc27a18..8832ae25a9fe 100644
--- a/website/docs/r/container_group.html.markdown
+++ b/website/docs/r/container_group.html.markdown
@@ -157,7 +157,7 @@ A `image_registry_credential` block supports:
 
 A `log_analytics` block supports:
 
-* `log_type` - (Required) The log type which should be used. Possible values are `ContainerInsights` and `ContainerInstanceLogs`. Changing this forces a new resource to be created.
+* `log_type` - (Optional) The log type which should be used. Possible values are `ContainerInsights` and `ContainerInstanceLogs`. Changing this forces a new resource to be created.
 
 * `workspace_id` - (Required) The Workspace ID of the Log Analytics Workspace. Changing this forces a new resource to be created.