Set the upgrade policy mode on Virtual Machine Scale Sets

During the Virtual Machine Scale Set creation in the Azure portal, under the Management tab, set the upgrade policy to Rolling, Automatic, or Manual.

When creating a new scale set using Azure CLI, use az vmss create and the -upgrade-policy-mode to set the upgrade policy mode.

az group create --name myResourceGroup --location chinanorth2

az vmss create \
    --resource-group myResourceGroup \
    --name myScaleSet \
    --orchestration-mode Flexible \
    --image Ubuntu2204 \
    --lb myLoadBalancer \
    --upgrade-policy-mode manual \
    --instance-count 5 \
    --admin-username azureuser \
    --generate-ssh-keys

When creating a new scale set using Azure PowerShell, use New-AzVmss and the -UpgradePolicyMode parameter to set the upgrade policy mode.

New-AzResourceGroup -Name "myResourceGroup" -Location "chinanorth2"

New-AzVmss `
  -ResourceGroupName "myResourceGroup" `
  -Location "chinanorth2" `
  -VMScaleSetName "myScaleSet" `
  -OrchestrationMode "Flexible" `
  -VirtualNetworkName "myVnet" `
  -SubnetName "mySubnet" `
  -PublicIpAddressName "myPublicIPAddress" `
  -LoadBalancerName "myLoadBalancer" `
  -UpgradePolicyMode "Manual"

When using an ARM template, add the upgradePolicy parameter to the properties section of your template to set the upgrade policy mode.

"properties": {
        "upgradePolicy": {
            "mode": "manual",
        }
    }