📘 Post Content

🚀 Deploy Azure Load Balancer and Virtual Machines using Terraform

In this blog, I’ll demonstrate how to use Terraform to deploy a basic Azure infrastructure including:

• A resource group
• A virtual network and subnet
• Two Windows virtual machines
• A public Load Balancer with a backend pool and health probe

---

🔧 Files Overview

File Name	Description
main.tf	Defines all resources
variables.tf	Declares variables
terraform.tfvars	Sets variable values
outputs.tf	Outputs the public IP of Load Balancer

---

📂 main.tf

hcl
provider "azurerm" {
  features {}
}

resource "azurerm_resource_group" "rg" {
  name     = var.resource_group_name
  location = var.location
}

resource "azurerm_virtual_network" "vnet" {
  name                = "example-vnet"
  address_space       = ["10.0.0.0/16"]
  location            = var.location
  resource_group_name = azurerm_resource_group.rg.name
}

resource "azurerm_subnet" "subnet" {
  name                 = "example-subnet"
  resource_group_name  = azurerm_resource_group.rg.name
  virtual_network_name = azurerm_virtual_network.vnet.name
  address_prefixes     = ["10.0.1.0/24"]
}

resource "azurerm_network_interface" "nic" {
  count               = 2
  name                = "example-nic-${count.index}"
  location            = var.location
  resource_group_name = azurerm_resource_group.rg.name

  ip_configuration {
    name                          = "internal"
    subnet_id                     = azurerm_subnet.subnet.id
    private_ip_address_allocation = "Dynamic"
  }
}

resource "azurerm_windows_virtual_machine" "vm" {
  count               = 2
  name                = "example-vm-${count.index}"
  location            = var.location
  resource_group_name = azurerm_resource_group.rg.name
  size                = "Standard_B1s"
  admin_username      = var.admin_username
  admin_password      = var.admin_password
  network_interface_ids = [azurerm_network_interface.nic[count.index].id]

  os_disk {
    caching              = "ReadWrite"
    storage_account_type = "Standard_LRS"
  }

  source_image_reference {
    publisher = "MicrosoftWindowsServer"
    offer     = "WindowsServer"
    sku       = "2019-Datacenter"
    version   = "latest"
  }
}

resource "azurerm_public_ip" "lb_public_ip" {
  name                = "example-lb-pip"
  location            = var.location
  resource_group_name = azurerm_resource_group.rg.name
  allocation_method   = "Static"
  sku                 = "Basic"
}

resource "azurerm_lb" "lb" {
  name                = "example-lb"
  location            = var.location
  resource_group_name = azurerm_resource_group.rg.name
  sku                 = "Basic"

  frontend_ip_configuration {
    name                 = "PublicIPAddress"
    public_ip_address_id = azurerm_public_ip.lb_public_ip.id
  }
}

resource "azurerm_lb_backend_address_pool" "bepool" {
  name                = "backend-pool"
  resource_group_name = azurerm_resource_group.rg.name
  loadbalancer_id     = azurerm_lb.lb.id
}

resource "azurerm_lb_probe" "probe" {
  name                = "http-probe"
  resource_group_name = azurerm_resource_group.rg.name
  loadbalancer_id     = azurerm_lb.lb.id
  protocol            = "Tcp"
  port                = 80
}

resource "azurerm_lb_rule" "lbrule" {
  name                           = "http-rule"
  resource_group_name            = azurerm_resource_group.rg.name
  loadbalancer_id                = azurerm_lb.lb.id
  protocol                       = "Tcp"
  frontend_port                  = 80
  backend_port                   = 80
  frontend_ip_configuration_name = "PublicIPAddress"
  backend_address_pool_id        = azurerm_lb_backend_address_pool.bepool.id
  probe_id                       = azurerm_lb_probe.probe.id
}



📂 variables.tf
variable "location" {
  description = "Azure region"
  default     = "japaneast"
}

variable "resource_group_name" {
  description = "Resource Group name"
}

variable "admin_username" {
  description = "VM admin username"
}

variable "admin_password" {
  description = "VM admin password"
  sensitive   = true
}

📂 terraform.tfvars
resource_group_name = "rg-lb-vm-demo"
admin_username      = "azureuser"
admin_password      = "P@ssw0rd1234!"

📂 outputs.tf

output "public_ip" {
  value = azurerm_public_ip.lb_public_ip.ip_address
}

▶️ Deploy Steps
1.Open terminal and navigate to your project folder

2.Initialize Terraform:
terraform init

3.Preview the plan:
terraform plan

4.Apply the configuration:
terraform apply
Once the deployment is done, Terraform will output a public IP. You can access this in your browser to test the Load Balancer after setting up web services on each VM.

✅ What’s Next
In the next post, I’ll show how to automatically install Nginx or IIS on the VM using remote-exec provisioner, so the VMs will instantly become web servers after deployment.

Stay tuned!
Thanks for reading 🙌
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