Create Terraform Configuration Files

All the code provided for the configuration files is provided by Microsoft Azure. So copy and paste code as it is and don’t change it you don’t know what you are doing.

Step 1: Create a separate folder for this.

Step 2: Create providers.tf file in that folder and open that file. Paste the below code in that.

#providers.tf 

terraform {
  required_version = ">=1.0"

  required_providers {
    azurerm = {
      source  = "hashicorp/azurerm"
      version = "~>3.0"
    }
    random = {
      source  = "hashicorp/random"
      version = "~>3.0"
    }
  }
}

provider "azurerm" {
  features {}
}

Step 3: Create main.tf file in same folder and paste the below code in that.

#main.tf

resource "azurerm_resource_group" "rg" {
  location = var.resource_group_location
  name     = "${random_pet.prefix.id}-rg"
}

# Create virtual network
resource "azurerm_virtual_network" "my_terraform_network" {
  name                = "${random_pet.prefix.id}-vnet"
  address_space       = ["10.0.0.0/16"]
  location            = azurerm_resource_group.rg.location
  resource_group_name = azurerm_resource_group.rg.name
}

# Create subnet
resource "azurerm_subnet" "my_terraform_subnet" {
  name                 = "${random_pet.prefix.id}-subnet"
  resource_group_name  = azurerm_resource_group.rg.name
  virtual_network_name = azurerm_virtual_network.my_terraform_network.name
  address_prefixes     = ["10.0.1.0/24"]
}

# Create public IPs
resource "azurerm_public_ip" "my_terraform_public_ip" {
  name                = "${random_pet.prefix.id}-public-ip"
  location            = azurerm_resource_group.rg.location
  resource_group_name = azurerm_resource_group.rg.name
  allocation_method   = "Dynamic"
}

# Create Network Security Group and rules
resource "azurerm_network_security_group" "my_terraform_nsg" {
  name                = "${random_pet.prefix.id}-nsg"
  location            = azurerm_resource_group.rg.location
  resource_group_name = azurerm_resource_group.rg.name

  security_rule {
    name                       = "RDP"
    priority                   = 1000
    direction                  = "Inbound"
    access                     = "Allow"
    protocol                   = "*"
    source_port_range          = "*"
    destination_port_range     = "3389"
    source_address_prefix      = "*"
    destination_address_prefix = "*"
  }
  security_rule {
    name                       = "web"
    priority                   = 1001
    direction                  = "Inbound"
    access                     = "Allow"
    protocol                   = "Tcp"
    source_port_range          = "*"
    destination_port_range     = "80"
    source_address_prefix      = "*"
    destination_address_prefix = "*"
  }
}

# Create network interface
resource "azurerm_network_interface" "my_terraform_nic" {
  name                = "${random_pet.prefix.id}-nic"
  location            = azurerm_resource_group.rg.location
  resource_group_name = azurerm_resource_group.rg.name

  ip_configuration {
    name                          = "my_nic_configuration"
    subnet_id                     = azurerm_subnet.my_terraform_subnet.id
    private_ip_address_allocation = "Dynamic"
    public_ip_address_id          = azurerm_public_ip.my_terraform_public_ip.id
  }
}

# Connect the security group to the network interface
resource "azurerm_network_interface_security_group_association" "example" {
  network_interface_id      = azurerm_network_interface.my_terraform_nic.id
  network_security_group_id = azurerm_network_security_group.my_terraform_nsg.id
}

# Create storage account for boot diagnostics
resource "azurerm_storage_account" "my_storage_account" {
  name                     = "diag${random_id.random_id.hex}"
  location                 = azurerm_resource_group.rg.location
  resource_group_name      = azurerm_resource_group.rg.name
  account_tier             = "Standard"
  account_replication_type = "LRS"
}


# Create virtual machine
resource "azurerm_windows_virtual_machine" "main" {
  name                  = "${var.prefix}-vm"
  admin_username        = "azureuser"
  admin_password        = random_password.password.result
  location              = azurerm_resource_group.rg.location
  resource_group_name   = azurerm_resource_group.rg.name
  network_interface_ids = [azurerm_network_interface.my_terraform_nic.id]
  size                  = "Standard_DS1_v2"

  os_disk {
    name                 = "myOsDisk"
    caching              = "ReadWrite"
    storage_account_type = "Premium_LRS"
  }

  source_image_reference {
    publisher = "MicrosoftWindowsServer"
    offer     = "WindowsServer"
    sku       = "2022-datacenter-azure-edition"
    version   = "latest"
  }


  boot_diagnostics {
    storage_account_uri = azurerm_storage_account.my_storage_account.primary_blob_endpoint
  }
}

# Install IIS web server to the virtual machine
resource "azurerm_virtual_machine_extension" "web_server_install" {
  name                       = "${random_pet.prefix.id}-wsi"
  virtual_machine_id         = azurerm_windows_virtual_machine.main.id
  publisher                  = "Microsoft.Compute"
  type                       = "CustomScriptExtension"
  type_handler_version       = "1.8"
  auto_upgrade_minor_version = true

  settings = <<SETTINGS
    {
      "commandToExecute": "powershell -ExecutionPolicy Unrestricted Install-WindowsFeature -Name Web-Server -IncludeAllSubFeature -IncludeManagementTools"
    }
  SETTINGS
}

# Generate random text for a unique storage account name
resource "random_id" "random_id" {
  keepers = {
    # Generate a new ID only when a new resource group is defined
    resource_group = azurerm_resource_group.rg.name
  }

  byte_length = 8
}

resource "random_password" "password" {
  length      = 20
  min_lower   = 1
  min_upper   = 1
  min_numeric = 1
  min_special = 1
  special     = true
}

resource "random_pet" "prefix" {
  prefix = var.prefix
  length = 1
}

Step 4: Create variables.tf file in same folder and paste below code in that.

#variables.tf

variable "resource_group_location" {
  default     = "eastus"
  description = "Location of the resource group."
}

variable "prefix" {
  type        = string
  default     = "win-vm-iis"
  description = "Prefix of the resource name"
}

Step 5: Create outputs.tf file in same folder and paste below code in that.

#outputs.tf

output "resource_group_name" {
  value = azurerm_resource_group.rg.name
}

output "public_ip_address" {
  value = azurerm_windows_virtual_machine.main.public_ip_address
}

output "admin_password" {
  sensitive = true
  value     = azurerm_windows_virtual_machine.main.admin_password
}

In this article, we will cover the whole process of creating Windows VM in Azure using Terraform. When you have to create multiple VMs, perhaps even identical ones, or machines with nearly identical configurations, it can be repetitive and time-consuming to go through the manual setup process each time. That’s where Terraform comes in. Think of it as a blueprint for building VMs without the need for manual work, reducing errors and saving you valuable time. Let’s first see what virtual machines, azure, and Terraform are.