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Configure virtual machine scale set with an existing Azure Load Balancer - Azure PowerShell
Learn how to configure a virtual machine scale set with an existing Azure Load Balancer.
greg-lindsay
greglin
load-balancer
how-to
03/26/2020
devx-track-azurepowershell, devx-track-azurecli
azurecli

Configure a virtual machine scale set with an existing Azure Load Balancer using Azure PowerShell

In this article, you'll learn how to configure a virtual machine scale set with an existing Azure Load Balancer.

Prerequisites

  • An Azure subscription.
  • An existing standard sku load balancer in the subscription where the virtual machine scale set will be deployed.
  • An Azure Virtual Network for the virtual machine scale set.

[!INCLUDE cloud-shell-try-it.md]

[!INCLUDE updated-for-az]

Sign in to Azure CLI

Sign into Azure.

Connect-AzAccount

Deploy a virtual machine scale set with existing load balancer

Replace the values in brackets with the names of the resources in your configuration.


$rsg = <resource-group>
$loc = <location>
$vms = <vm-scale-set-name>
$vnt = <virtual-network>
$sub = <subnet-name>
$lbn = <load-balancer-name>
$pol = <upgrade-policy-mode>

$lb = Get-AzLoadBalancer -ResourceGroupName $rsg -Name $lbn

New-AzVmss -ResourceGroupName $rsg -Location $loc -VMScaleSetName $vms -VirtualNetworkName $vnt -SubnetName $sub -LoadBalancerName $lb -UpgradePolicyMode $pol

The below example deploys a virtual machine scale set with:

  • Virtual machine scale set named myVMSS
  • Azure Load Balancer named myLoadBalancer
  • Load balancer backend pool named myBackendPool
  • Azure Virtual Network named myVnet
  • Subnet named mySubnet
  • Resource group named myResourceGroup

$rsg = "myResourceGroup"
$loc = "East US 2"
$vms = "myVMSS"
$vnt = "myVnet"
$sub = "mySubnet"
$pol = "Automatic"
$lbn = "myLoadBalancer"

$lb = Get-AzLoadBalancer -ResourceGroupName $rsg -Name $lbn

New-AzVmss -ResourceGroupName $rsg -Location $loc -VMScaleSetName $vms -VirtualNetworkName $vnt -SubnetName $sub -LoadBalancerName $lb -UpgradePolicyMode $pol

Note

After the scale set has been created, the backend port cannot be modified for a load balancing rule used by a health probe of the load balancer. To change the port, you can remove the health probe by updating the Azure virtual machine scale set, update the port and then configure the health probe again.

Next steps

In this article, you deployed a virtual machine scale set with an existing Azure Load Balancer. To learn more about virtual machine scale sets and load balancer, see: