Create and deploy a virtual machine scale set

Virtual machine scale sets make it easy for you to deploy and manage identical virtual machines as a set. Scale sets provide a highly scalable and customizable compute layer for hyperscale applications, and they support Windows platform images, Linux platform images, custom images, and extensions. For more information about scale sets, see Virtual machine scale sets.

This tutorial shows you how to create a virtual machine scale set without using the Azure portal. For information about how to use the Azure portal, see How to create a virtual machine scale set with the Azure portal.

Note

For more information about Azure Resource Manager resources, see Azure Resource Manager vs. classic deployment.

Sign in to Azure

If you're using Azure CLI 2.0 or Azure PowerShell to create a scale set, you first need to sign in to your subscription.

For more information about how to install, set up, and sign in to Azure with Azure CLI or PowerShell, see Getting Started with Azure CLI 2.0 or Get started with Azure PowerShell cmdlets.

az login
Login-AzureRmAccount

Create a resource group

You first need to create a resource group that the virtual machine scale set is associated with.

az group create --location westus2 --name MyResourceGroup1
New-AzureRmResourceGroup -Location westus2 -Name MyResourceGroup1

Create from Azure CLI

With Azure CLI, you can create a virtual machine scale set with minimal effort. If you omit default values, they are provided for you. For example, if you don't specify any virtual network information, a virtual network is created for you. If you omit the following parts, they are created for you:

  • A load balancer
  • A virtual network
  • A public IP address

When choosing the virtual machine image that you want to use on the virtual machine scale set, you have a few choices:

  • URN
    The identifier of a resource:
    Win2012R2Datacenter

  • URN alias
    The friendly name of a URN:
    MicrosoftWindowsServer:WindowsServer:2012-R2-Datacenter:latest

  • Custom resource id
    The path to an Azure resource:
    /subscriptions/subscription-guid/resourceGroups/MyResourceGroup/providers/Microsoft.Compute/images/MyImage

  • Web resource
    The path to an HTTP URI:
    http://contoso.blob.core.windows.net/vhds/osdiskimage.vhd

Tip

You can get a list of available images with az vm image list.

To create a virtual machine scale set, you must specify the following:

  • Resource group
  • Name
  • Operating system image
  • Authentication information

The following example creates a basic virtual machine scale set (this step might take a few minutes).

az vmss create --resource-group MyResourceGroup1 --name MyScaleSet --image UbuntuLTS --authentication-type password --admin-username azureuser --admin-password P@ssw0rd!

Once the command finishes you will now have your virtual machine scale set created. You may need to get the IP address of the virtual machine so that you can connect to it. You can get a lot of different information about the virtual machine (including the IP address) with the following command.

az vmss list-instance-connection-info --resource-group MyResourceGroup1 --name MyScaleSet

Create from PowerShell

PowerShell is more complicated to use than Azure CLI. While Azure CLI provides defaults for networking-related resources (such as load balancers, IP addresses, and virtual networks), PowerShell does not. Referencing an image with PowerShell is a slightly more complicated too. You can get images with the following cmdlets:

  1. Get-AzureRMVMImagePublisher
  2. Get-AzureRMVMImageOffer
  3. Get-AzureRmVMImageSku

The cmdlets work can be piped in sequence. Here is an example of how to get all images for the West US 2 region with a publisher that has the name microsoft in it.

Get-AzureRMVMImagePublisher -Location WestUS2 | Where-Object PublisherName -Like *microsoft* | Get-AzureRMVMImageOffer | Get-AzureRmVMImageSku | Select-Object PublisherName, Offer, Skus
PublisherName              Offer                    Skus
-------------              -----                    ----
microsoft-ads              linux-data-science-vm    linuxdsvm
microsoft-ads              standard-data-science-vm standard-data-science-vm
MicrosoftAzureSiteRecovery Process-Server           Windows-2012-R2-Datacenter
MicrosoftBizTalkServer     BizTalk-Server           2013-R2-Enterprise
MicrosoftBizTalkServer     BizTalk-Server           2013-R2-Standard
MicrosoftBizTalkServer     BizTalk-Server           2016-Developer
MicrosoftBizTalkServer     BizTalk-Server           2016-Enterprise
...

The workflow for creating a virtual machine scale set is as follows:

  1. Create a config object that holds information about the scale set.
  2. Reference the base OS image.
  3. Configure the operating system settings: authentication, VM name prefix, and user/pass.
  4. Configure networking.
  5. Create the scale set.

This example creates a basic two-instance scale set for a computer that has Windows Server 2016 installed.

# Resource group name from above
$rg = "MyResourceGroup1"
$location = "WestUS2"

# Create a config object
$vmssConfig = New-AzureRmVmssConfig -Location $location -SkuCapacity 2 -SkuName Standard_A0  -UpgradePolicyMode Automatic

# Reference a virtual machine image from the gallery
Set-AzureRmVmssStorageProfile $vmssConfig -ImageReferencePublisher MicrosoftWindowsServer -ImageReferenceOffer WindowsServer -ImageReferenceSku 2016-Datacenter -ImageReferenceVersion latest

# Set up information for authenticating with the virtual machine
Set-AzureRmVmssOsProfile $vmssConfig -AdminUsername azureuser -AdminPassword P@ssw0rd! -ComputerNamePrefix myvmssvm

# Create the virtual network resources

## Basics
$subnet = New-AzureRmVirtualNetworkSubnetConfig -Name "my-subnet" -AddressPrefix 10.0.0.0/24
$vnet = New-AzureRmVirtualNetwork -Name "my-network" -ResourceGroupName $rg -Location $location -AddressPrefix 10.0.0.0/16 -Subnet $subnet

## Load balancer
$publicIP = New-AzureRmPublicIpAddress -Name "PublicIP" -ResourceGroupName $rg -Location $location -AllocationMethod Static -DomainNameLabel "myuniquedomain"
$frontendIP = New-AzureRmLoadBalancerFrontendIpConfig -Name "LB-Frontend" -PublicIpAddress $publicIP
$backendPool = New-AzureRmLoadBalancerBackendAddressPoolConfig -Name "LB-backend"
$probe = New-AzureRmLoadBalancerProbeConfig -Name "HealthProbe" -Protocol Tcp -Port 80 -IntervalInSeconds 15 -ProbeCount 2
$inboundNATRule1= New-AzureRmLoadBalancerRuleConfig -Name "webserver" -FrontendIpConfiguration $frontendIP -Protocol Tcp -FrontendPort 80 -BackendPort 80 -IdleTimeoutInMinutes 15 -Probe $probe -BackendAddressPool $backendPool
$inboundNATPool1 = New-AzureRmLoadBalancerInboundNatPoolConfig -Name "RDP" -FrontendIpConfigurationId $frontendIP.Id -Protocol TCP -FrontendPortRangeStart 53380 -FrontendPortRangeEnd 53390 -BackendPort 3389

New-AzureRmLoadBalancer -ResourceGroupName $rg -Name "LB1" -Location $location -FrontendIpConfiguration $frontendIP -LoadBalancingRule $inboundNATRule1 -InboundNatPool $inboundNATPool1 -BackendAddressPool $backendPool -Probe $probe

## IP address config
$ipConfig = New-AzureRmVmssIpConfig -Name "my-ipaddress" -LoadBalancerBackendAddressPoolsId $backendPool.Id -SubnetId $vnet.Subnets[0].Id -LoadBalancerInboundNatPoolsId $inboundNATPool1.Id

# Attach the virtual network to the IP object
Add-AzureRmVmssNetworkInterfaceConfiguration -VirtualMachineScaleSet $vmssConfig -Name "network-config" -Primary $true -IPConfiguration $ipConfig

# Create the scale set with the config object (this step might take a few minutes)
New-AzureRmVmss -ResourceGroupName $rg -Name "MyScaleSet1" -VirtualMachineScaleSet $vmssConfig

Using a custom virtual machine image

If you are creating a scale set from your own custom image, instead of referencing a virtual machine image from the gallery, the Set-AzureRmVmssStorageProfile command would look like this:

Set-AzureRmVmssStorageProfile -OsDiskCreateOption FromImage -ManagedDisk PremiumLRS -OsDiskCaching "None" -OsDiskOsType Linux -ImageReferenceId (Get-AzureRmImage -ImageName $VMImage -ResourceGroupName $rg).id

Create from a template

You can deploy a virtual machine scale set by using an Azure Resource Manager template. You can create your own template or use one from the template repository. These templates can be deployed directly to your Azure subscription.

Note

To create your own template, you create a JSON text file. For general information about how to create and customize a template, see Azure Resource Manager templates.

A sample template is available on GitHub. For more information about how to create and use that sample, see Minimum viable scale set.

Create from Visual Studio

With Visual Studio, you can create an Azure resource group project and add a virtual machine scale set template to it. You can choose whether you want to import it from GitHub or the Azure Web Application Gallery. A deployment PowerShell script is also generated for you. For more information, see How to create a virtual machine scale set with Visual Studio.

Create from the Azure portal

The Azure portal provides a convenient way to quickly create a scale set. For more information, see How to create a virtual machine scale set with the Azure portal.

Next steps

Learn more about data disks.

Learn how to manage your apps.