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Quickstart: Create a Windows VM cluster in Azure using Terraform
Applies to: ✔️ Windows VMs
This article shows you how to create a Windows VM cluster (containing three Windows VM instances) in Azure using Terraform.
- Create a random value for the Azure resource group name using random_pet.
- Create an Azure resource group using azurerm_resource_group.
- Create a random value for the Windows VM host name random_string.
- Create a random password for the Windows VMs using random_password.
- Create a Windows VM using the compute module.
- Create a virtual network along with subnet using the network module.
Prerequisites
Implement the Terraform code
Note
The sample code for this article is located in the Azure Terraform GitHub repo. You can view the log file containing the test results from current and previous versions of Terraform.
See more articles and sample code showing how to use Terraform to manage Azure resources
Create a directory in which to test the sample Terraform code and make it the current directory.
Create a file named
providers.tf
and insert the following code:terraform { required_version = ">=1.0" required_providers { azurerm = { source = "hashicorp/azurerm" version = "~>3.0" } random = { source = "hashicorp/random" version = "~>3.0" } } } provider "azurerm" { features {} }
Create a file named
main.tf
and insert the following code:resource "random_pet" "rg_name" { prefix = var.resource_group_name_prefix } resource "azurerm_resource_group" "rg" { name = random_pet.rg_name.id location = var.resource_group_location } resource "random_string" "windows_server_vm_hostname" { length = 8 lower = true upper = false special = false } resource "random_pet" "windows_server_public_ip_dns" { prefix = "dns" } resource "random_password" "password" { length = 16 special = true lower = true upper = true numeric = true } # The following module is a Terraform Verified Module. # For more information about Verified Modules, see # https://github.com/azure/terraform-azure-modules/ module "windows_server" { count = 3 # Define 3 Windows Server VMs source = "Azure/compute/azurerm" resource_group_name = azurerm_resource_group.rg.name vnet_subnet_id = module.network.vnet_subnets[0] is_windows_image = true vm_hostname = "vm-${random_string.windows_server_vm_hostname.result}-${count.index}" delete_os_disk_on_termination = true admin_password = random_password.password.result vm_os_simple = "WindowsServer" public_ip_dns = ["${random_pet.windows_server_public_ip_dns.id}-${count.index}"] } # The following module is a Terraform Verified Module. # For more information about Verified Modules, see # https://github.com/azure/terraform-azure-modules/ module "network" { source = "Azure/network/azurerm" resource_group_name = azurerm_resource_group.rg.name version = "5.2.0" subnet_prefixes = ["10.0.1.0/24"] subnet_names = ["subnet1"] use_for_each = true }
Create a file named
variables.tf
and insert the following code:variable "resource_group_location" { type = string default = "eastus" description = "Location for all resources." } variable "resource_group_name_prefix" { type = string default = "rg" description = "Prefix of the resource group name that's combined with a random value so name is unique in your Azure subscription." }
Create a file named
outputs.tf
and insert the following code:output "resource_group_name" { value = azurerm_resource_group.rg.name } output "windows_vm_public_names" { value = module.windows_server[*].public_ip_dns_name } output "vm_public_ip_addresses" { value = module.windows_server[*].public_ip_address } output "vm_private_ip_addresses" { value = module.windows_server[*].network_interface_private_ip } output "vm_hostnames" { value = module.windows_server[*].vm_names }
Initialize Terraform
Run terraform init to initialize the Terraform deployment. This command downloads the Azure provider required to manage your Azure resources.
terraform init -upgrade
Key points:
- The
-upgrade
parameter upgrades the necessary provider plugins to the newest version that complies with the configuration's version constraints.
Create a Terraform execution plan
Run terraform plan to create an execution plan.
terraform plan -out main.tfplan
Key points:
- The
terraform plan
command creates an execution plan, but doesn't execute it. Instead, it determines what actions are necessary to create the configuration specified in your configuration files. This pattern allows you to verify whether the execution plan matches your expectations before making any changes to actual resources. - The optional
-out
parameter allows you to specify an output file for the plan. Using the-out
parameter ensures that the plan you reviewed is exactly what is applied.
Apply a Terraform execution plan
Run terraform apply to apply the execution plan to your cloud infrastructure.
terraform apply main.tfplan
Key points:
- The example
terraform apply
command assumes you previously ranterraform plan -out main.tfplan
. - If you specified a different filename for the
-out
parameter, use that same filename in the call toterraform apply
. - If you didn't use the
-out
parameter, callterraform apply
without any parameters.
Cost information isn't presented during the virtual machine creation process for Terraform like it is for the Azure portal. If you want to learn more about how cost works for virtual machines, see the Cost optimization Overview page.
Verify the results
Get the Azure resource group name.
resource_group_name=$(terraform output -raw resource_group_name)
Run az vm list with a JMESPath query to display the names of the virtual machines created in the resource group.
az vm list \ --resource-group $resource_group_name \ --query "[].{\"VM Name\":name}" -o table
Clean up resources
When you no longer need the resources created via Terraform, do the following steps:
Run terraform plan and specify the
destroy
flag.terraform plan -destroy -out main.destroy.tfplan
Key points:
- The
terraform plan
command creates an execution plan, but doesn't execute it. Instead, it determines what actions are necessary to create the configuration specified in your configuration files. This pattern allows you to verify whether the execution plan matches your expectations before making any changes to actual resources. - The optional
-out
parameter allows you to specify an output file for the plan. Using the-out
parameter ensures that the plan you reviewed is exactly what is applied.
- The
Run terraform apply to apply the execution plan.
terraform apply main.destroy.tfplan
Troubleshoot Terraform on Azure
Troubleshoot common problems when using Terraform on Azure