How to create a VM scale set from a Snapshot - azure

Question

I want to create a VM Scale set and use a snapshot as base for my windows VMs. As the Set-AzureRmVmssStorageProfile only accepts images my first try was to convert the snapshot to an image by use:
$rgName = #...
$location = #...
$snapshotName = "mySnapshot"
$imageName = "myImage"
$snapshot = Get-AzureRmSnapshot -ResourceGroupName $rgName -SnapshotName $snapshotName
$imageConfig = New-AzureRmImageConfig -Location $location
$imageConfig = Set-AzureRmImageOsDisk -Image $imageConfig -OsState Generalized -OsType Windows -SnapshotId $snapshot.Id
New-AzureRmImage -ImageName $imageName -ResourceGroupName $rgName -Image $imageConfig
But in this case the image that is created has no Source Blob URI:
what gives me the error:
New-AzureRmVmss : The URI Microsoft.Azure.Commands.Compute.Automation.Models.PSImage does not look to be correct blob URI.
On my deploy commands for azure:
$vmss = New-AzureRmVmssConfig -Location $loc -SkuCapacity 2 -SkuName "Standard_DS1_v2" -UpgradePolicyMode "manual" -ErrorAction Stop
Add-AzureRmVmssNetworkInterfaceConfiguration -VirtualMachineScaleSet $vmss -Name "vmssNetwork" -Primary $true -IPConfiguration $ipConfig
Set-AzureRmVmssStorageProfile -VirtualMachineScaleSet $vmss -OsDiskCreateOption "FromImage" -OsDiskCaching "None" `
-Image $ImgRef -OsDiskOsType Windows -OsDiskName "C"
Set-AzureRmVmssOSProfile -ComputerNamePrefix $vmNamePrefix -AdminUsername $adminUsername -AdminPassword $adminPassword -VirtualMachineScaleSet $vmss
New-AzureRmVmss -ResourceGroupName $currentrg -Name $vmssName -VirtualMachineScaleSet $vmss -Verbose -ErrorAction Stop;
Is there a other way to create the image or set a source blob uri?
Or is it possible to use a snapshot for creating an VM Scale Set?
-- Edit 1 --
Afer the hint from Charles Xu I changhed the image creation to first create a dik, but I still get the same error. New Code is:
$rgName = #...
$location = #...
$snapshotName = "mySnapshot"
$imageName = "myImage"
$storageType = 'Standard_LRS'
$diskName = "myDisk"
$snapshot = Get-AzureRmSnapshot -ResourceGroupName $rgName -SnapshotName $snapshotName
$diskConfig = New-AzureRmDiskConfig -AccountType $storageType -Location $location -CreateOption Copy -SourceResourceId $snapshot.Id
$disk = New-AzureRmDisk -Disk $diskConfig -ResourceGroupName $rgName -DiskName $diskName
$imageConfig = New-AzureRmImageConfig -Location $location
$imageConfig = Set-AzureRmImageOsDisk -Image $imageConfig -OsState Generalized -OsType Windows -ManagedDiskId $disk.Id
New-AzureRmImage -ImageName $imageName -ResourceGroupName $rgName -Image $imageConfig

Answer 1

You can create an image from an Azure VM. For example, you can create a windows image from the windows VM through PowerShell, see Create and use a custom image for virtual machine scale sets with Azure PowerShell. When the image is OK, Just create the VMSS like this:
New-AzureRmVmss `
-ResourceGroupName "myResourceGroup" `
-Location "EastUS" `
-VMScaleSetName "myScaleSet" `
-VirtualNetworkName "myVnet" `
-SubnetName "mySubnet" `
-PublicIpAddressName "myPublicIPAddress" `
-LoadBalancerName "myLoadBalancer" `
-UpgradePolicyMode "Automatic" `
-ImageName "yourImage"
Also, the snapshot is OK, but you should create the image from the snapshot first. And then create the VMSS from the image. With the command New-AzureRmImage, the image should be a managed image, so you cannot see the URI. Just use the managed image Id in the command like this:
Set-AzureRmVmssStorageProfile -VirtualMachineScaleSet $vmss -OsDiskCreateOption "FromImage" -OsDiskCaching "None" -ImageReferenceId yourImageId -OsDiskOsType Windows -OsDiskName "C"
And just talk about how to create images, I would suggest you the Packer and there is an example here.
Update
I assume that your custom image is prepared. And the PowerShell script like this:
#Get the custom image
$image = Get-AzureRmImage -ResourceGroupName charlesTerraform -ImageName myPackerImage
# Get the existing Vnet
$vnet = Get-AzureRmVirtualNetwork -ResourceGroupName charlesTerraform -Name pakcerVnet
#IP configuration
$ipName = "ipConfig"
#create the IP configuration
$ipConfig = New-AzureRmVmssIpConfig -Name $ipName -LoadBalancerBackendAddressPoolsId $null -SubnetId $vnet.Subnets[0].Id
#create vmss configuration
$vmss = New-AzureRmVmssConfig -Location "East US" -SkuCapacity 2 -SkuName "Standard_DS1_v2" -UpgradePolicyMode "manual" -ErrorAction Stop
##Add the network interface configuration to the scale set configuration
Add-AzureRmVmssNetworkInterfaceConfiguration -VirtualMachineScaleSet $vmss -Name "vmssNetwork" -Primary $true -IPConfiguration $ipConfig
# set the stroage profile
Set-AzureRmVmssStorageProfile -VirtualMachineScaleSet $vmss -OsDiskCreateOption "FromImage" -OsDiskCaching "None" -ImageReferenceId $image.Id -OsDiskOsType Linux
#set the os profile
Set-AzureRmVmssOSProfile -ComputerNamePrefix "Test" -AdminUsername "azureuser" -AdminPassword "azureuser#2018" -VirtualMachineScaleSet $vmss
#create the vmss
New-AzureRmVmss -ResourceGroupName charlesTerraform -Name TestVmss -VirtualMachineScaleSet $vmss

Answer 2

folks. So what about create a "Virtual Machine in Scale Set" from a customized snapshot. Is this possible or one scale set could only have one base image and all vms under this scale set could only reimaged to the same baseline ?