Create Shrink-AzDisk.ps1

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# Variables
$DiskID = "/subscriptions/b1392e53-0162-4387-af15-dbf530c06f40/resourceGroups/TA180M/providers/Microsoft.Compute/disks/Windows10Pro_OsDisk_1_dfa2bffedea144c3901e9e4a3fadbbe3"
$VMName = "Windows10Pro"
$DiskSizeGB = 64
$AzSubscription = "Azure for Students"
# Script
# Provide your Azure admin credentials
Connect-AzAccount
#Provide the subscription Id of the subscription where snapshot is created
Select-AzSubscription -Subscription $AzSubscription
# VM to resize disk of
$VM = Get-AzVm | ? Name -eq $VMName
#Provide the name of your resource group where snapshot is created
$resourceGroupName = $VM.ResourceGroupName
# Get Disk from ID
$Disk = Get-AzDisk | ? Id -eq $DiskID
# Get VM/Disk generation from Disk
$HyperVGen = $Disk.HyperVGeneration
# Get Disk Name from Disk
$DiskName = $Disk.Name
# Get SAS URI for the Managed disk
$SAS = Grant-AzDiskAccess -ResourceGroupName $resourceGroupName -DiskName $DiskName -Access 'Read' -DurationInSecond 600000;
#Provide the managed disk name
#$managedDiskName = "yourManagedDiskName"
#Provide Shared Access Signature (SAS) expiry duration in seconds e.g. 3600.
#$sasExpiryDuration = "3600"
#Provide storage account name where you want to copy the snapshot - the script will create a new one temporarily
$storageAccountName = "shrink" + [system.guid]::NewGuid().tostring().replace('-','').substring(1,18)
#Name of the storage container where the downloaded snapshot will be stored
$storageContainerName = $storageAccountName
#Provide the key of the storage account where you want to copy snapshot.
#$storageAccountKey = "yourStorageAccountKey"
#Provide the name of the VHD file to which snapshot will be copied.
$destinationVHDFileName = "$($VM.StorageProfile.OsDisk.Name).vhd"
#Generate the SAS for the managed disk
#$sas = Grant-AzureRmDiskAccess -ResourceGroupName $resourceGroupName -DiskName $managedDiskName -Access Read -DurationInSecond $sasExpiryDuration
#Create the context for the storage account which will be used to copy snapshot to the storage account
$StorageAccount = New-AzStorageAccount -ResourceGroupName $resourceGroupName -Name $storageAccountName -SkuName Standard_LRS -Location $VM.Location
$destinationContext = $StorageAccount.Context
$container = New-AzStorageContainer -Name $storageContainerName -Permission Off -Context $destinationContext
#Copy the snapshot to the storage account and wait for it to complete
Start-AzStorageBlobCopy -AbsoluteUri $SAS.AccessSAS -DestContainer $storageContainerName -DestBlob $destinationVHDFileName -DestContext $destinationContext
while(($state = Get-AzStorageBlobCopyState -Context $destinationContext -Blob $destinationVHDFileName -Container $storageContainerName).Status -ne "Success") { $state; Start-Sleep -Seconds 20 }
$state
# Revoke SAS token
Revoke-AzDiskAccess -ResourceGroupName $resourceGroupName -DiskName $DiskName
# Emtpy disk to get footer from
$emptydiskforfootername = "$($VM.StorageProfile.OsDisk.Name)-empty.vhd"
# Empty disk URI
#$EmptyDiskURI = $container.CloudBlobContainer.Uri.AbsoluteUri + "/" + $emptydiskforfooter
$diskConfig = New-AzDiskConfig `
-Location $VM.Location `
-CreateOption Empty `
-DiskSizeGB $DiskSizeGB `
-HyperVGeneration $HyperVGen
$dataDisk = New-AzDisk `
-ResourceGroupName $resourceGroupName `
-DiskName $emptydiskforfootername `
-Disk $diskConfig
$VM = Add-AzVMDataDisk `
-VM $VM `
-Name $emptydiskforfootername `
-CreateOption Attach `
-ManagedDiskId $dataDisk.Id `
-Lun 63
Update-AzVM -ResourceGroupName $resourceGroupName -VM $VM
$VM | Stop-AzVM -Force
# Get SAS token for the empty disk
$SAS = Grant-AzDiskAccess -ResourceGroupName $resourceGroupName -DiskName $emptydiskforfootername -Access 'Read' -DurationInSecond 600000;
# Copy the empty disk to blob storage
Start-AzStorageBlobCopy -AbsoluteUri $SAS.AccessSAS -DestContainer $storageContainerName -DestBlob $emptydiskforfootername -DestContext $destinationContext
while(($state = Get-AzStorageBlobCopyState -Context $destinationContext -Blob $emptydiskforfootername -Container $storageContainerName).Status -ne "Success") { $state; Start-Sleep -Seconds 20 }
$state
# Revoke SAS token
Revoke-AzDiskAccess -ResourceGroupName $resourceGroupName -DiskName $emptydiskforfootername
# Remove temp empty disk
Remove-AzVMDataDisk -VM $VM -DataDiskNames $emptydiskforfootername
Update-AzVM -ResourceGroupName $resourceGroupName -VM $VM
# Delete temp disk
Remove-AzDisk -ResourceGroupName $resourceGroupName -DiskName $emptydiskforfootername -Force;
# Get the blobs
$emptyDiskblob = Get-AzStorageBlob -Context $destinationContext -Container $storageContainerName -Blob $emptydiskforfootername
$osdisk = Get-AzStorageBlob -Context $destinationContext -Container $storageContainerName -Blob $destinationVHDFileName
$footer = New-Object -TypeName byte[] -ArgumentList 512
write-output "Get footer of empty disk"
$downloaded = $emptyDiskblob.ICloudBlob.DownloadRangeToByteArray($footer, 0, $emptyDiskblob.Length - 512, 512)
$osDisk.ICloudBlob.Resize($emptyDiskblob.Length)
$footerStream = New-Object -TypeName System.IO.MemoryStream -ArgumentList (,$footer)
write-output "Write footer of empty disk to OSDisk"
$osDisk.ICloudBlob.WritePages($footerStream, $emptyDiskblob.Length - 512)
Write-Output -InputObject "Removing empty disk blobs"
$emptyDiskblob | Remove-AzStorageBlob -Force
#Provide the name of the Managed Disk
$NewDiskName = "$DiskName" + "-new"
#Create the new disk with the same SKU as the current one
$accountType = $Disk.Sku.Name
# Get the new disk URI
$vhdUri = $osdisk.ICloudBlob.Uri.AbsoluteUri
# Specify the disk options
$diskConfig = New-AzDiskConfig -AccountType $accountType -Location $VM.location -DiskSizeGB $DiskSizeGB -SourceUri $vhdUri -CreateOption Import -StorageAccountId $StorageAccount.Id -HyperVGeneration $HyperVGen
#Create Managed disk
$NewManagedDisk = New-AzDisk -DiskName $NewDiskName -Disk $diskConfig -ResourceGroupName $resourceGroupName
$VM | Stop-AzVM -Force
# Set the VM configuration to point to the new disk
Set-AzVMOSDisk -VM $VM -ManagedDiskId $NewManagedDisk.Id -Name $NewManagedDisk.Name
# Update the VM with the new OS disk
Update-AzVM -ResourceGroupName $resourceGroupName -VM $VM
$VM | Start-AzVM
start-sleep 180
# Please check the VM is running before proceeding with the below tidy-up steps
# Delete old Managed Disk
Remove-AzDisk -ResourceGroupName $resourceGroupName -DiskName $DiskName -Force;
# Delete old blob storage
$osdisk | Remove-AzStorageBlob -Force
# Delete temp storage account
$StorageAccount | Remove-AzStorageAccount -Force