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Azure Virtual Machines Terraform Module

This terraform module is designed to deploy azure Windows or Linux virtual machines with Public IP, Availability Set and Network Security Group support.

These types of resources supported:

• Linux Virtual Machine
• Windows Virtual Machine
• Linux VM with SQL Server
• Windows VM with SQL Server
• Public IP
• Network Security Group
• Availability Set
• SSH2 Key generation for Dev Environments
• Azure Monitoring Diagnostics

Module Usage

module "virtual-machine" {
  source  = "kumarvna/virtual-machine/azurerm"
  version = "2.0.0"

  # Resource Group, location, VNet and Subnet details
  resource_group_name  = "rg-hub-demo-internal-shared-westeurope-001"
  location             = "westeurope"
  virtual_network_name = "vnet-default-hub-westeurope"
  subnet_name          = "snet-management-default-hub-westeurope"
  virtual_machine_name = "vm-linux"

  # (Optional) To enable Azure Monitoring and install log analytics agents
  log_analytics_workspace_name = var.log_analytics_workspace_id
  hub_storage_account_name     = var.hub_storage_account_id

  # This module support multiple Pre-Defined Linux and Windows Distributions.
  # Linux images: ubuntu1804, ubuntu1604, centos75, centos77, centos81, coreos
  # Windows Images: windows2012r2dc, windows2016dc, windows2019dc, windows2016dccore
  # MSSQL 2017 images: mssql2017exp, mssql2017dev, mssql2017std, mssql2017ent
  # MSSQL 2019 images: mssql2019dev, mssql2019std, mssql2019ent
  # MSSQL 2019 Linux OS Images:
  # RHEL8 images: mssql2019ent-rhel8, mssql2019std-rhel8, mssql2019dev-rhel8
  # Ubuntu images: mssql2019ent-ubuntu1804, mssql2019std-ubuntu1804, mssql2019dev-ubuntu1804
  # Bring your own License (BOYL) images: mssql2019ent-byol, mssql2019std-byol
  os_flavor                  = "linux"
  linux_distribution_name    = "ubuntu1804"
  virtual_machine_size       = "Standard_A2_v2"
  generate_admin_ssh_key     = false
  admin_ssh_key_data         = "~/.ssh/id_rsa.pub"
  instances_count            = 2
  enable_vm_availability_set = true

  # Network Seurity group port allow definitions for each Virtual Machine
  # NSG association to be added automatically for all network interfaces.
  # SSH port 22 and 3389 is exposed to the Internet recommended for only testing.
  # For production environments, recommended to use a VPN or private connection.
  nsg_inbound_rules = [
    {
      name                   = "ssh"
      destination_port_range = "22"
      source_address_prefix  = "*"
    },

    {
      name                   = "http"
      destination_port_range = "80"
      source_address_prefix  = "*"
    },
  ]

  # Adding TAG's to your Azure resources (Required)
  # ProjectName and Env are already declared above, to use them here, create a varible.
  tags = {
    ProjectName  = "demo-internal"
    Env          = "dev"
    Owner        = "user@example.com"
    BusinessUnit = "CORP"
    ServiceClass = "Gold"
  }
}

Default Local Administrator and the Password

This module utilizes azureadmin as a local administrator on virtual machines. If you want to you use custom username, then specify the same by setting up the argument admin_username with valid user string.

By default, this module generates a strong password for all virtual machines. If you want to set the custom password, specify the argument admin_password with valid string.

This module also generates SSH2 Key pair for Linux servers by default, however, it is only recommended to use for dev environment. For production environments, please generate your own SSH2 key with a passphrase and input the key by providing the path to the argument admin_ssh_key_data.

Pre-Defined Windows and Linux VM Images

There are pre-defined Windows or Linux images available to deploy by setting up the argument linux_distribution_name or windows_distribution_name with this module.

OS type	Available Pre-defined Images
Linux	ubuntu1804, ubuntu1604, centos75, centos77, centos81, coreos
Windows	windows2012r2dc, windows2016dc, windows2019dc, windows2016dccore
MS SQL 2017	mssql2017exp, mssql2017dev, mssql2017std, mssql2017ent
MS SQL 2019	mssql2019dev, mssql2019std, mssql2019ent
MS SQL 2019 Linux (RHEL8)	mssql2019ent-rhel8, mssql2019std-rhel8, mssql2019dev-rhel8
MS SQL 2019 Linux (Ubuntu)	mssql2019ent-ubuntu1804, mssql2019std-ubuntu1804, mssql2019dev-ubuntu1804
MS SQL 2019 Bring your own License (BOYL)	mssql2019ent-byol, mssql2019std-byol

Custom Virtual Machine images

If the pre-defined Windows or Linux variants are not sufficient then, you can specify the custom image by setting up the argument custom_image with appropriate values. Custom images can be used to bootstrap configurations such as preloading applications, application configurations, and other OS configurations. For more information check here

module "virtual-machine" {
  source  = "kumarvna/virtual-machine/azurerm"
  version = "2.0.0"

  # .... omitted

  os_flavor                  = "linux"
  instances_count            = 2
  enable_vm_availability_set = true
  enable_public_ip_address   = true

  custom_image = {
      publisher = "myPublisher"
      offer     = "myOffer"
      sku       = "mySKU"
      version   = "latest"
    }

  # .... omitted

Custom DNS servers

This is an optional feature and only applicable if you are using your own DNS servers superseding default DNS services provided by Azure. Set the argument dns_servers = ["4.4.4.4"] to enable this option. For multiple DNS servers, set the argument dns_servers = ["4.4.4.4", "8.8.8.8"]

Advanced Usage of the Module

disable_password_authentication - enable or disable VM password authentication

While creating the Linux servers, its recommended to use ssh2 keys to log in than using a password. By default, this module generates the ssh2 key pair for Linux VM's. If you want the password to login Linux VM, set the argument disable_password_authentication = false, this instructs the module to create a random password.

enable_ip_forwarding - enable or disable IP forwarding

The setting must be enabled for every network interface that is attached to the virtual machine that receives traffic that the virtual machine needs to forward. A virtual machine can forward traffic whether it has multiple network interfaces or a single network interface attached to it. While IP forwarding is an Azure setting, the virtual machine must also run an application able to forward the traffic, such as firewall, WAN optimization, and load balancing applications. IP forwarding is typically used with user-defined routes.

By default, this not enabled and set to disable. To enable the IP forwarding using this module, set the argument enable_ip_forwarding = true.

enable_accelerated_networking for Virtual Machines

Accelerated networking enables single root I/O virtualization (SR-IOV) to a VM, greatly improving its networking performance. This high-performance path bypasses the host from the data path, which reduces latency, jitter, and CPU utilization for the most demanding network workloads on supported VM types.

Accelerated Networking is supported on most general-purpose and compute-optimized instance sizes with two or more virtual CPUs (vCPUs). These supported series are Dv2/DSv2 and F/Fs.

On instances that support hyperthreading, accelerated networking is supported on VM instances with four or more vCPUs. Supported series are: D/Dsv3, D/Dsv4, E/Esv3, Ea/Easv4, Fsv2, Lsv2, Ms/Mms, and Ms/Mmsv2.

By default, this not enabled and set to disable. To enable the accelerated networking using this module, set the argument enable_accelerated_networking = true.

private_ip_address_allocation_type - Static IP Assignment

By default, the Azure DHCP servers assign the private IPv4 address for the primary IP configuration of the Azure network interface to the network interface within the virtual machine operating system. Unless necessary, you should never manually set the IP address of a network interface within the virtual machine's operating system.

By default this not enabled and set to disable. To enable the static private IP using this module, set the argument private_ip_address_allocation_type = "Static" and set the argument private_ip_address with valid static private IP.

dedicated_host_id - Adding Azure Dedicated Hosts

Azure Dedicated Host is a service that provides physical servers - able to host one or more virtual machines - dedicated to one Azure subscription. Dedicated hosts are the same physical servers used in our data centers, provided as a resource. You can provision dedicated hosts within a region, availability zone, and fault domain. Virtual machine scale sets are not currently supported on dedicated hosts.

By default, this not enabled and set to disable. To add a dedicated host to Virtual machine using this module, set the argument dedicated_host_id with valid dedicated host resource ID. It is possible to add Dedicated Host resource outside this module.

enable_vm_availability_set - Create highly available virtual machines

An Availability Set is a logical grouping capability for isolating VM resources from each other when they're deployed. Azure makes sure that the VMs you place within an Availability Set run across multiple physical servers, compute racks, storage units, and network switches. If a hardware or software failure happens, only a subset of your VMs are impacted and your overall solution stays operational. Availability Sets are essential for building reliable cloud solutions.

By default, this not enabled and set to disable. To enable the Availability Set using this module, set the argument enable_vm_availability_set = true.

source_image_id - Create a VM from a managed image

We can create multiple virtual machines from an Azure managed VM image. A managed VM image contains the information necessary to create a VM, including the OS and data disks. The virtual hard disks (VHDs) that make up the image, including both the OS disks and any data disks, are stored as managed disks. One managed image supports up to 20 simultaneous deployments.

When you use the managed VM image, custom image, or any other source image reference are not valid. By default, this not enabled and set to use predefined or custom images. To utilize Azure managed VM Image by this module, set the argument source_image_id with valid manage image resource id.

license_type - Bring your own License to your Windows server

Azure Hybrid Benefit for Windows Server allows you to use your on-premises Windows Server licenses and run Windows virtual machines on Azure at a reduced cost. You can use Azure Hybrid Benefit for Windows Server to deploy new virtual machines with Windows OS.

By default, this is set to None. To use the Azure Hybrid Benefit for windows server deployment by this module, set the argument license_type to valid values. Possible values are None, Windows_Client and Windows_Server.

os_disk_storage_account_type - Azure managed disks

Azure managed disks are block-level storage volumes that are managed by Azure and used with Azure Virtual Machines. Managed disks are like a physical disk in an on-premises server but virtualized. With managed disks, all you have to do is specify the disk size, the disk type, and provision the disk. Once you provision the disk, Azure handles the rest. The available types of disks are ultra disks, premium solid-state drives (SSD), standard SSDs, and standard hard disk drives (HDD).

By default, this module uses the standard SSD with Locally redundant storage (StandardSSD_LRS). To use other type of disks, set the argument os_disk_storage_account_type with valid values. Possible values are Standard_LRS, StandardSSD_LRS and Premium_LRS.

Network Security Groups

By default, the network security groups connected to Network Interface and allow necessary traffic and block everything else (deny-all rule). Use nsg_inbound_rules in this Terraform module to create a Network Security Group (NSG) for network interface and allow it to add additional rules for inbound flows.

In the Source and Destination columns, VirtualNetwork, AzureLoadBalancer, and Internet are service tags, rather than IP addresses. In the protocol column, Any encompasses TCP, UDP, and ICMP. When creating a rule, you can specify TCP, UDP, ICMP or *. 0.0.0.0/0 in the Source and Destination columns represents all addresses.

You cannot remove the default rules, but you can override them by creating rules with higher priorities.

module "virtual-machine" {
  source  = "kumarvna/virtual-machine/azurerm"
  version = "2.0.0"

  # .... omitted
  
  os_flavor                  = "linux"
  linux_distribution_name    = "ubuntu1804"
  virtual_machine_size       = "Standard_A2_v2"  
  generate_admin_ssh_key     = false
  admin_ssh_key_data         = "./id_rsa.pub"

  nsg_inbound_rules = [
    {
      name                   = "ssh"
      destination_port_range = "22"
      source_address_prefix  = "*"
    },

    {
      name                   = "http"
      destination_port_range = "80"
      source_address_prefix  = "*"
    },
  ]
}

Recommended naming and tagging conventions

Well-defined naming and metadata tagging conventions help to quickly locate and manage resources. These conventions also help associate cloud usage costs with business teams via chargeback and show back accounting mechanisms.

Resource naming

An effective naming convention assembles resource names by using important resource information as parts of a resource's name. For example, using these recommended naming conventions, a public IP resource for a production SharePoint workload is named like this: pip-sharepoint-prod-westus-001.

Metadata tags

When applying metadata tags to the cloud resources, you can include information about those assets that couldn't be included in the resource name. You can use that information to perform more sophisticated filtering and reporting on resources. This information can be used by IT or business teams to find resources or generate reports about resource usage and billing.

The following list provides the recommended common tags that capture important context and information about resources. Use this list as a starting point to establish your tagging conventions.

Tag Name	Description	Key	Example Value	Required?
Project Name	Name of the Project for the infra is created. This is mandatory to create a resource names.	ProjectName	{Project name}	Yes
Application Name	Name of the application, service, or workload the resource is associated with.	ApplicationName	{app name}	Yes
Approver	Name Person responsible for approving costs related to this resource.	Approver	{email}	Yes
Business Unit	Top-level division of your company that owns the subscription or workload the resource belongs to. In smaller organizations, this may represent a single corporate or shared top-level organizational element.	BusinessUnit	FINANCE, MARKETING,{Product Name},CORP,SHARED	Yes
Cost Center	Accounting cost center associated with this resource.	CostCenter	{number}	Yes
Disaster Recovery	Business criticality of this application, workload, or service.	DR	Mission Critical, Critical, Essential	Yes
Environment	Deployment environment of this application, workload, or service.	Env	Prod, Dev, QA, Stage, Test	Yes
Owner Name	Owner of the application, workload, or service.	Owner	{email}	Yes
Requester Name	User that requested the creation of this application.	Requestor	{email}	Yes
Service Class	Service Level Agreement level of this application, workload, or service.	ServiceClass	Dev, Bronze, Silver, Gold	Yes
Start Date of the project	Date when this application, workload, or service was first deployed.	StartDate	{date}	No
End Date of the Project	Date when this application, workload, or service is planned to be retired.	EndDate	{date}	No

This module allows you to manage the above metadata tags directly or as an variable using variables.tf. All Azure resources which support tagging can be tagged by specifying key-values in argument tags. Tag ResourceName is added automatically to all resources.

module "virtual-machine" {
  source  = "kumarvna/virtual-machine/azurerm"
  version = "2.0.0"

  # Resource Group, location, VNet and Subnet details
  resource_group_name  = "rg-hub-demo-internal-shared-westeurope-001"

  # ... omitted

  tags = {
    ProjectName  = "demo-internal"
    Env          = "dev"
    Owner        = "user@example.com"
    BusinessUnit = "CORP"
    ServiceClass = "Gold"
  }
}

Inputs

Name	Description	Type	Default
resource_group_name	The name of the resource group in which resources are created	string	""
location	The location of the resource group in which resources are created	string	""
virtual_network_name	The name of the virtual network	string	""
subnet_name	The name of the subnet to use in VM scale set	string	""
virtual_machine_name	The name of the virtual machine	string	""
os_flavor	Specify the flavor of the operating system image to deploy Virtual Machine. Possible values are windows and linux	string	"windows"
virtual_machine_size	The Virtual Machine SKU for the Virtual Machine	string	"Standard_A2_v2"
instances_count	The number of Virtual Machines required	number	1
enable_ip_forwarding	Should IP Forwarding be enabled?	string	false
enable_accelerated_networking	Should Accelerated Networking be enabled?	string	false
private_ip_address_allocation_type	The allocation method used for the Private IP Address. Possible values are Dynamic and Static.	string	false
private_ip_address	The Static IP Address which should be used. This is valid only when private_ip_address_allocation is set to Static.	string	null
dns_servers	List of dns servers to use for network interface	string	[]
enable_vm_availability_set	Manages an Availability Set for Virtual Machines.	string	false
enable_public_ip_address	Reference to a Public IP Address to associate with the NIC	string	false
source_image_id	The ID of an Image which each Virtual Machine should be based on	string	null
custom_image	Provide the custom image to this module if the default variants are not sufficient	map(object)	null
linux_distribution_list	Pre-defined Azure Linux VM images list	map(object)	ubuntu1804
linux_distribution_name	Variable to pick an OS flavor for Linux based Virtual Machine. Possible values are centos81, centos77, centos77, ubuntu1804, ubuntu1604, coreos, mssql2019ent-rhel8, mssql2019std-rhel8, mssql2019dev-rhel8, mssql2019ent-ubuntu1804, mssql2019std-ubuntu1804, mssql2019dev-ubuntu1804	string	ubuntu1804
windows_distribution_list	Pre-defined Azure Windows VM images list	map(object)	"windows2019dc"
windows_distribution_name	Variable to pick an OS flavor for Windows based VM. Possible values are windows2012r2dc, windows2016dc, windows2019dc, windows2016dccore, mssql2017exp, mssql2017dev, mssql2017std, mssql2017ent, mssql2019dev, mssql2019std, mssql2019ent, mssql2019ent-byol, mssql2019std-byol	string	"windows2019dc"
os_disk_storage_account_type	The Type of Storage Account for Internal OS Disk. Possible values include Standard_LRS, StandardSSD_LRS and Premium_LRS.	string	"StandardSSD_LRS"
generate_admin_ssh_key	Generates a secure private key and encodes it as PEM	string	true
admin_ssh_key_data	specify the path to the existing SSH key to authenticate Linux virtual machine	string	""
admin_username	The username of the local administrator used for the Virtual Machine	string	"azureadmin"
admin_password	The Password which should be used for the local-administrator on this Virtual Machine	string	null
disable_password_authentication	Should Password Authentication be disabled on this Virtual Machine. Applicable to Linux Virtual machine	string	true
nsg_inbound_rules	List of network rules to apply to network interface	object	{}
dedicated_host_id	The ID of a Dedicated Host where this machine should be run on	string	null
license_type	Specifies the type of on-premise license which should be used for this Virtual Machine. Possible values are None, Windows_Client and Windows_Server.	string	"None"
Tags	A map of tags to add to all resources	map	{}

Outputs

Name	Description
admin_ssh_key_public	The generated public key data in PEM format
admin_ssh_key_private	The generated private key data in PEM format
windows_vm_password	Password for the windows Virtual Machine
windows_vm_public_ips	Public IP's map for the all windows Virtual Machines
linux_vm_public_ips	Public IP's map for the all windows Virtual Machines
windows_vm_private_ips	Public IP's map for the all windows Virtual Machines
linux_vm_private_ips	Public IP's map for the all windows Virtual Machines
linux_virtual_machine_ids	The resource id's of all Linux Virtual Machine
windows_virtual_machine_ids	The resource id's of all Windows Virtual Machine
network_security_group_ids	List of Network security groups and ids
vm_availability_set_id	The resource ID of Virtual Machine availability set

Resource Graph

Authors

Originally created by Kumaraswamy Vithanala

Other resources

• Windows Virtual Machine
• Linux Virtual Machine
• Linux VM running SQL Server
• Windows VM running SQL Server
• Terraform AzureRM Provider Documentation