Infra Automation by Terraform for Azure Cloud VM— Part 4

This example provisions a Virtual Machine with Managed Disks. Other examples of the azurerm_virtual_machine resource , here we will discuss more on the main.tf, variabels.tf wrt azure vm

Variables.tf

# variables.tf

variable "resource_group_name" {
  type        = string
  description = "The name of the Azure resource group."
}

variable "location" {
  type        = string
  description = "The Azure region where resources will be provisioned."
}

variable "vm_name" {
  type        = string
  description = "The name of the Azure VM."
}

variable "vm_size" {
  type        = string
  description = "The size of the Azure VM, e.g., Standard_DS2_v2."
  default     = "Standard_DS2_v2"
}

variable "admin_username" {
  type        = string
  description = "The username for the VM."
}

variable "admin_password" {
  type        = string
  description = "The password for the VM."
}

variable "os_disk_size_gb" {
  type        = number
  description = "The size of the OS disk in gigabytes."
  default     = 30
}

variable "network_security_group" {
  type        = string
  description = "The name of the Network Security Group associated with the VM."
}

variable "virtual_network" {
  type        = string
  description = "The name of the Virtual Network associated with the VM."
}

variable "subnet" {
  type        = string
  description = "The name of the Subnet associated with the VM."
}

main.tf

# main.tf

provider "azurerm" {
  features = {}
}

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

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

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

resource "azurerm_network_security_group" "example" {
  name                = var.network_security_group
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
}

resource "azurerm_network_interface" "example" {
  name                = "${var.vm_name}-nic"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name

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

resource "azurerm_windows_virtual_machine" "example" {
  name                  = var.vm_name
  resource_group_name   = azurerm_resource_group.example.name
  location              = azurerm_resource_group.example.location
  size                  = var.vm_size
  admin_username        = var.admin_username
  admin_password        = var.admin_password
  network_interface_ids = [azurerm_network_interface.example.id]

  os_disk {
    caching              = "ReadWrite"
    storage_account_type = "Standard_LRS"
    disk_size_gb         = var.os_disk_size_gb
  }

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

  provision_vm_agent = true
}

dev.tfvars

# terraform.tfvars

resource_group_name      = "example-rg"
location                = "East US"
vm_name                 = "example-vm"
admin_username          = "adminuser"
admin_password          = "P@ssw0rd123!"
network_security_group  = "example-nsg"
virtual_network         = "example-vnet"
subnet                  = "example-subnet"

How to use the tfvars in terraform plan & apply

terraform plan -var-file=path/to/your/variables.tfvars
terraform apply -var-file=path/to/your/variables.tfvars