Posted on April 28, 2023
Terraform is an open-source infrastructure as code (IaC) tool that allows users to define and manage their cloud infrastructure in a declarative way. This means that users can write code that describes their desired infrastructure state, and Terraform will handle the provisioning and management of the actual resources in the cloud provider. We talk about Terraform theory in detail in our previous article Part1 - Terraform on Microsoft Azure From the downloaded zip file you need to extract the executable to your directory e.g. The Azure Command-Line Interface (CLI) is a cross-platform command-line tool that can be installed locally on Windows computers. You can use the Azure CLI for Windows to connect to Azure and execute administrative commands on Azure resources. Make sure to restart your command prompt after setting global path and azure cli The source code for this article can be found on GitHub. Prepare your working directory for other commands Output: Show changes required by the current configuration, and create an execution plan and output to Output: Create or update infrastructure Output: Output-
When you no longer need the resources created via Terraform, do the following steps: Destroy previously-created infrastructure and output to Output: Input variable Let you customize the terraform module so that can use reused for multiple configurations if required. Let's see how we can declare input variables. Example of using a variable in Output value Output values make information about your infrastructure available on the command line, and can expose information for other Terraform configurations to use. Output values are similar to return values in programming languages. Example of using an output value Provided step-by-step instructions on how to perform this transformation also discussion was focused on transforming a Terraform file to use input and output variables.What is Terraform?
Terraform to create/provision a virtual machine (VM) in Azure
c:\terraform and then make sure to update your global path.
main.tf
This is the main Terraform configuration file where you define the resources and their configurations that you want to create or manage in your cloud infrastructure.
# Provider block for Azure
provider "azurerm" {
features {}
}
# Create a resource group
resource "azurerm_resource_group" "myresourcegroup" {
name = "my-resource-group"
location = "eastus"
}
# Create a virtual network
resource "azurerm_virtual_network" "mynetwork" {
name = "my-virtual-network"
address_space = ["10.0.0.0/16"]
location = azurerm_resource_group.myresourcegroup.location
resource_group_name = azurerm_resource_group.myresourcegroup.name
}
# Create a subnet
resource "azurerm_subnet" "mysubnet" {
name = "my-subnet"
address_prefixes = ["10.0.1.0/24"]
virtual_network_name = azurerm_virtual_network.mynetwork.name
resource_group_name = azurerm_resource_group.myresourcegroup.name
}
# Create a public IP address
resource "azurerm_public_ip" "mypublicip" {
name = "my-public-ip"
location = azurerm_resource_group.myresourcegroup.location
resource_group_name = azurerm_resource_group.myresourcegroup.name
allocation_method = "Static"
}
# Create a network interface
resource "azurerm_network_interface" "mynic" {
name = "my-network-interface"
location = azurerm_resource_group.myresourcegroup.location
resource_group_name = azurerm_resource_group.myresourcegroup.name
ip_configuration {
name = "my-ip-configuration"
subnet_id = azurerm_subnet.mysubnet.id
private_ip_address_allocation = "Dynamic"
public_ip_address_id = azurerm_public_ip.mypublicip.id
}
}
# Create a virtual machine
resource "azurerm_virtual_machine" "myvm" {
name = "my-virtual-machine"
location = azurerm_resource_group.myresourcegroup.location
resource_group_name = azurerm_resource_group.myresourcegroup.name
network_interface_ids = ["${azurerm_network_interface.mynic.id}"]
vm_size = "Standard_B2s"
storage_image_reference {
publisher = "Canonical"
offer = "UbuntuServer"
sku = "18.04-LTS"
version = "latest"
}
storage_os_disk {
name = "my-os-disk"
caching = "ReadWrite"
create_option = "FromImage"
managed_disk_type = "Standard_LRS"
}
os_profile {
computer_name = "myvm"
admin_username = "admin_01"
admin_password = "myvmToRock@123"
}
os_profile_linux_config {
disable_password_authentication = false
}
}
terraform init -upgrade
*.tfplanterraform plan -out main.tfplan
terraform apply main.tfplan
Validating Deployment/Virtual Machine
Clean up resources
*.destroy.tfplanterraform plan -destroy -out main.destroy.tfplan
terraform apply main.destroy.tfplan
Using Input and Output variable
variables.tf# Define input variables
variable "resource_group_name" {
type = string
default = "my-resource-group"
}
variable "location" {
type = string
default = "eastus"
}
variable "virtual_network_name" {
type = string
default = "my-virtual-network"
}
main.tf (note: we are using var here)# Create a resource group
resource "azurerm_resource_group" "myresourcegroup" {
name = var.resource_group_name
location = var.location
}
# Create a virtual network
resource "azurerm_virtual_network" "mynetwork" {
name = var.virtual_network_name
address_space = var.address_space
location = azurerm_resource_group.myresourcegroup.location
resource_group_name = azurerm_resource_group.myresourcegroup.name
}
outputs.tf output "resource_group_name" {
value = azurerm_resource_group.myresourcegroup.name
}
output "virtual_network_name" {
value = azurerm_virtual_network.mynetwork.name
}
output "subnet_name" {
value = azurerm_subnet.mysubnet.name
}
terraform output resource_group_name
Summary