Add private option for loadbalancer

README.md

@@ -1,28 +1,83 @@
 # terraform-azurerm-loadbalancer #
 [![Build Status](https://travis-ci.org/Azure/terraform-azurerm-loadbalancer.svg?branch=master)](https://travis-ci.org/Azure/terraform-azurerm-loadbalancer)
 
-Create a basic load balancer in Azure
-===========
+A terraform module to provide load balancers in Azure with the following
+characteristics:
 
-This Terraform module deploys a load balancer in Azure.
+  - Ability to specify `public` or `private` loadbalancer using: `var.type`.  Default is public.
+  - Specify subnet to use for the loadbalancer: `frontend_subnet_id` 
+  - For `private` loadbalancer, specify the private ip address using
+    `frontend_private_ip_address`
+  - Specify the type of the private ip address with `frontend_private_ip_address_allocation`, Dynamic or Static , default is `Dynamic`
 
 Usage
 -----
+Public loadbalancer example:
 
 ```hcl
+variable "location" {
+  default = "eastus"
+}
+
 module "mylb" {
-  source   = "Azure/loadbalancer/azurerm"
-  location = "North Central US"
+  source              = "Azure/loadbalancer/azurerm"
+  resource_group_name = "${var.resource_group_name}"
+  location            = "${var.location}"
+  prefix              = "terraform-test"
+
   "remote_port" {
     ssh = ["Tcp", "22"]
   }
+
   "lb_port" {
     http = ["80", "Tcp", "80"]
+  }
+}
+
+module "network" {
+  source              = "Azure/network/azurerm"
+  location            = "${var.location}"
+  resource_group_name = "${var.resource_group_name}"
+}
+```
+
+Private loadbalancer example:
+
+```hcl
+module "mylb" {
+  source                                 = "Azure/loadbalancer/azurerm"
+  location                               = "westus"
+  type                                   = "private"
+  frontend_subnet_id                     = "${module.network.vnet_subnets[0]}"
+  frontend_private_ip_address_allocation = "Static"
+  frontend_private_ip_address            = "10.0.1.6"
+
+  "remote_port" {
+    ssh = ["Tcp", "22"]
+  }
+
+  "lb_port" {
+    http  = ["80", "Tcp", "80"]
     https = ["443", "Tcp", "443"]
   }
+
   "tags" {
     cost-center = "12345"
-    source     = "terraform"
+    source      = "terraform"
+  }
+}
+
+module "network" {
+  source              = "Azure/network/azurerm"
+  resource_group_name = "myapp"
+  location            = "westus"
+  address_space       = "10.0.0.0/16"
+  subnet_prefixes     = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]
+  subnet_names        = ["subnet1", "subnet2", "subnet3"]
+
+  tags = {
+    environment = "dev"
+    costcenter  = "it"
   }
 }
 ```

main.tf

@@ -6,6 +6,7 @@ resource "azurerm_resource_group" "azlb" {
 }
 
 resource "azurerm_public_ip" "azlb" {
+  count                        = "${var.type == "public" ? 1 : 0}"
   name                         = "${var.prefix}-publicIP"
   location                     = "${var.location}"
   resource_group_name          = "${azurerm_resource_group.azlb.name}"
@@ -18,8 +19,11 @@ resource "azurerm_lb" "azlb" {
   location            = "${var.location}"
 
   frontend_ip_configuration {
-    name                 = "${var.frontend_name}"
-    public_ip_address_id = "${azurerm_public_ip.azlb.id}"
+    name                          = "${var.frontend_name}"
+    public_ip_address_id          = "${var.type == "public" ? join("",azurerm_public_ip.azlb.*.id) : ""}"
+    subnet_id                     = "${var.frontend_subnet_id}"
+    private_ip_address            = "${var.frontend_private_ip_address}"
+    private_ip_address_allocation = "${var.frontend_private_ip_address_allocation}"
   }
 }
 

outputs.tf

@@ -35,12 +35,12 @@ output "azurerm_lb_nat_rule_ids" {
 
 output "azurerm_public_ip_id" {
   description = "the id for the azurerm_lb_public_ip resource"
-  value       = "${azurerm_public_ip.azlb.id}"
+  value       = "${azurerm_public_ip.azlb.*.id}"
 }
 
 output "azurerm_public_ip_address" {
   description = "the ip address for the azurerm_lb_public_ip resource"
-  value       = "${azurerm_public_ip.azlb.ip_address}"
+  value       = "${azurerm_public_ip.azlb.*.ip_address}"
 }
 
 output "azurerm_lb_backend_address_pool_id" {

variables.tf

@@ -54,3 +54,24 @@ variable "tags" {
     source = "terraform"
   }
 }
+
+variable "type" {
+  type        = "string"
+  description = "(Optional) Defined if the loadbalancer is private or public"
+  default     = "public"
+}
+
+variable "frontend_subnet_id" {
+  description = "(Optional) Frontend subnet id to use when in private mode"
+  default     = ""
+}
+
+variable "frontend_private_ip_address" {
+  description = "(Optional) Private ip address to assign to frontend. Use it with type = private"
+  default     = ""
+}
+
+variable "frontend_private_ip_address_allocation" {
+  description = "(Optional) Frontend ip allocation type (Static or Dynamic)"
+  default     = "Dynamic"
+}