Born to Automate : Managing snapshots on Azure Virtual machines

1 Introduction

One of the challenges working with Azure infrastructure and VM’s on Azure is that there is native functionality provided by Azure to manage snapshots on the machine. With traditional on premise virtualization infrastructures this was a very easy and simple task to perform.

In this post, we’ll see how to use the combination of various Azure PowerShell cmdlets available to create a backup of the OSDisks and data disks on the VM to a storage container and later use these backups to restore the VM to the state we wanted to restore to. Later we’ll combine all these options into a PowerShell module and use the functions exposed to create and restore backups whenever needed.

2 Connecting to Azure Subscription

Before we start, the first step is to connect to the Azure subscription. You can use the Add-AzureAccount cmdlet to connect to the Azure subscription.

Add-AzureAccount

Get-AzureSubscription

PS C:\Windows\System32\WindowsPowerShell\v1.0> Add-AzureAccount

Id Type Subscriptions Tenants

-- ---- ------------- -------

p.prathap@prowareness.nl User 2a9f4b1c-91fd-4fe6-8f9a-fd2ea8aa4840 24b080cd-5874-44ab-9862-8d7e0e0781ab

PS C:\Windows\System32\WindowsPowerShell\v1.0> Get-AzureSubscription

SubscriptionId : 2a9f4b1c-91fd-4fe6-8f9a-fd2ea8aa4840

SubscriptionName : Prajeesh Prathap

Environment : AzureCloud

SupportedModes : AzureServiceManagement,AzureResourceManager

DefaultAccount : p.prathap@prowareness.nl

Accounts : {p.prathap@prowareness.nl}

IsDefault : True

IsCurrent : True

CurrentStorageAccountName :

TenantId : 24b080cd-5874-44ab-9862-8d7e0e0781ab

2.1 Associate storage account

After logging to the azure account, you need to check the Azure subscription details by using the Get-AzureSubcription cmdlet. Sometimes, you need to use the Set-AzureSubscription cmdlet to associate a storage account to the subscription.

To find out which storage accounts are available and then register to the subscription, use the Get-AzureStorageAccount cmdlet as given below. If you have multiple storage accounts available, all of them will be listed as given below.

PS C:\Windows\System32\WindowsPowerShell\v1.0> Get-AzureStorageAccount

StorageAccountDescription : devvm015

AffinityGroup :

Location : West Europe

GeoReplicationEnabled : True

GeoPrimaryLocation : West Europe

GeoSecondaryLocation : North Europe

Label : devvm015

StorageAccountStatus : Created

StatusOfPrimary : Available

StatusOfSecondary : Available

Endpoints : {https://devvm015.blob.core.windows.net/, https://devvm015.queue.core.windows.net/,

https://devvm015.table.core.windows.net/}

AccountType : Standard_GRS

StorageAccountName : devvm015

OperationDescription : Get-AzureStorageAccount

OperationId : 247cc1a6-4748-aef6-82c6-bf970a21f4cc

OperationStatus : Succeeded

StorageAccountDescription : Implicitly created storage service

AffinityGroup :

Location : West Europe

GeoReplicationEnabled : True

GeoPrimaryLocation : West Europe

GeoSecondaryLocation : North Europe

Label : portalvhds9zh30b55gfhx8

StorageAccountStatus : Created

StatusOfPrimary : Available

StatusOfSecondary : Available

Endpoints : {https://portalvhds9zh30b55gfhx8.blob.core.windows.net/, https://portalvhds9zh30b55gfhx8.queue.core.windows.net/,

https://portalvhds9zh30b55gfhx8.table.core.windows.net/}

AccountType : Standard_GRS

StorageAccountName : portalvhds9zh30b55gfhx8

OperationDescription : Get-AzureStorageAccount

OperationId : 247cc1a6-4748-aef6-82c6-bf970a21f4cc

OperationStatus : Succeeded

WARNING: GeoReplicationEnabled property will be deprecated in a future release of Azure PowerShell. The value will be merged into the AccountType propert

From the list use the storage account label property value to associate to the subscription using the Set-AzureSubscription cmdlet as given below.

Set-AzureSubscription -SubscriptionId $subId -CurrentStorageAccountName $accName -PassThru

PS C:\Windows\System32\WindowsPowerShell\v1.0> Set-AzureSubscription -SubscriptionId 2a9f4b1c-91fd-4fe6-8f9a-fd2ea8aa4840 -CurrentStorageAccountName portalvhds9zh30b55gfhx8 -PassThru

Id : 2a9f4b1c-91fd-4fe6-8f9a-fd2ea8aa4840

Name : Prajeesh Prathap

Environment : AzureCloud

Account : p.prathap@prowareness.nl

Properties : {[SupportedModes, AzureServiceManagement,AzureResourceManager], [Tenants, 24b080cd-5874-44ab-9862-8d7e0e0781ab], [Default, True],

[StorageAccount, portalvhds9zh30b55gfhx8]}

Next, we need to find out the virtual machine that we need to create a backup for. Using the Get-AzureVM cmdlet, you can list all the available machines in your subscription.

PS C:\Windows\System32\WindowsPowerShell\v1.0> Get-AzureVM

ServiceName Name Status

----------- ---- ------

ChefTestVM00 ChefTestVM00 StoppedDeallocated

DEVMachine-auyh2433 DEVMachine ReadyRole

DevVS2015-p25312tj DevVS2015 StoppedDeallocated

3 Backup Azure VM Disks

From the list to choose a machine, use the –ServiceName and –Name option for the Get-AzureVM cmdlet. Later we can use the Get-AzureOSDisk and Get-AzureDataDisk cmdlets to retrieve the operating system disks and data disks for the virtual machine.

$azureVM = Get-AzureVM -ServiceName $serviceName -Name $vmName

Get-AzureOSDisk -VM $azureVM

Get-AzureDataDisk -VM $azureVM

PS C:\Windows\System32\WindowsPowerShell\v1.0> $azureVM = Get-AzureVM -ServiceName DevVS2015-p25312tj -Name DevVS2015

PS C:\Windows\System32\WindowsPowerShell\v1.0> Get-AzureOSDisk -VM $azureVM

HostCaching : ReadWrite

DiskLabel :

DiskName : DevVS2015-p25312tj-DevVS2015-os-1432737990155

MediaLink : https://devvm015.blob.core.windows.net/vhds/DevVS2015-p25312tj-DevVS2015-os-1432737990155.vhd

SourceImageName : 03f55de797f546a1b29d1b8d66be687a__Visual-Studio-2015-Community-RC-AzureSDK-2.6-WS2012R2-201505.15

OS : Windows

IOType : Standard

ResizedSizeInGB :

ExtensionData :

PS C:\Windows\System32\WindowsPowerShell\v1.0> Get-AzureDataDisk -VM $azureVM

To access the storage accounts, we need to create a storage context. To copy the disk image of the operating system disk, we need to first create a storage context, both for the source and destination context. To create a storage context, we need to have a storage account name and storage account key.

3.1 Create storage context

To get the storage account name of the Azure VM disk, we can make use of the MediaLink property of the Azure VM. The host property of the MediaLink contains the storage account name as the first part of the host. To get the storage account name use the cmdlet as below.

PS C:\Windows\System32\WindowsPowerShell\v1.0> $osDisk = Get-AzureOSDisk -VM $azureVM

PS C:\Windows\System32\WindowsPowerShell\v1.0> $osDisk.MediaLink | select -ExpandProperty Host

devvm015.blob.core.windows.net

PS C:\Windows\System32\WindowsPowerShell\v1.0> ($osDisk.MediaLink | select -ExpandProperty Host).Split('.')[0]

devvm015

PS C:\Windows\System32\WindowsPowerShell\v1.0> $sourceStorageAccount = ($osDisk.MediaLink | select -ExpandProperty Host).Split('.')[0]

3.2 Create the source storage context

From the storage account name, we retrieve the storage key by using the Get-AzureStorageKey cmdlet as given below.

$osDisk = Get-AzureOSDisk -VM $azureVM

$sourceStorageAccount = ($osDisk.MediaLink | select -ExpandProperty Host).Split('.')[0]

$sourceStorageAccountKey = Get-AzureStorageKey -StorageAccountName $sourceStorageAccount |% {$_.Primary}

$sourceStorageContext = New-AzureStorageContext -StorageAccountName $sourceStorageAccount -StorageAccountKey $sourceStorageAccountKey

PS C:\Windows\System32\WindowsPowerShell\v1.0> $sourceStorageAccount = ($osDisk.MediaLink | select -ExpandProperty Host).Split('.')[0]

PS C:\Windows\System32\WindowsPowerShell\v1.0> Get-AzureStorageAccount -StorageAccountName $sourceStorageAccount

StorageAccountDescription : devvm015

AffinityGroup :

Location : West Europe

GeoReplicationEnabled : True

GeoPrimaryLocation : West Europe

GeoSecondaryLocation : North Europe

Label : devvm015

StorageAccountStatus : Created

StatusOfPrimary : Available

StatusOfSecondary : Available

Endpoints : {https://devvm015.blob.core.windows.net/, https://devvm015.queue.core.windows.net/,

https://devvm015.table.core.windows.net/}

AccountType : Standard_GRS

StorageAccountName : devvm015

OperationDescription : Get-AzureStorageAccount

OperationId : 5abb7dc6-fe18-a21c-acd4-0b746078513e

OperationStatus : Succeeded

WARNING: GeoReplicationEnabled property will be deprecated in a future release of Azure PowerShell. The value will be merged into the AccountType propert

PS C:\Windows\System32\WindowsPowerShell\v1.0> $sourceStorageAccountKey = Get-AzureStorageKey -StorageAccountName $sourceStorageAccount

Once we have the storage account name and the storage key, we can use these information to create the storage context object.

PS C:\Windows\System32\WindowsPowerShell\v1.0> $sourceStorageAccountKey = Get-AzureStorageKey -StorageAccountName $sourceStorageAccount |% {$_.Primary}

PS C:\Windows\System32\WindowsPowerShell\v1.0> $sourceStorageContext = New-AzureStorageContext -StorageAccountName $sourceStorageAccount -StorageAccountKey $sourceStorageAccountKey

3.3 Create destination storage account

To create a new storage account use the New-AzureStorageAccount cmdlet

New-AzureStorageAccount -StorageAccountName "vmbackupstorage6787" `

-Label "vmbackupstorage" `

-Location "West Europe"

PS C:\Windows\System32\WindowsPowerShell\v1.0> Get-AzureLocation | select -ExpandProperty displayname

West US

Central US

South Central US

East US

East US 2

North Europe

West Europe

Southeast Asia

East Asia

Japan West

PS C:\Windows\System32\WindowsPowerShell\v1.0> New-AzureStorageAccount -StorageAccountName "vmbackupstorage6787" -Label "vmbackupstorage" -Location "West Europe"

OperationDescription OperationId OperationStatus

-------------------- ----------- ---------------

New-AzureStorageAccount c32c52c7-6c1e-a4dc-8cff-1977de7ee935 Succeeded

3.4 Create the destination storage context

To create the destination storage context, we will follow the same steps that we used to create the source storage context.

$destStorageAccountName = "vmbackupstorage6787"

$destStorageAccountKey = Get-AzureStorageKey -StorageAccountName $destStorageAccountName |% {$_.Primary}

$destStorageContext = New-AzureStorageContext -StorageAccountName $destStorageAccountName `

-StorageAccountKey $destStorageAccountKey

PS C:\Windows\System32\WindowsPowerShell\v1.0> $destStorageAccountName = "vmbackupstorage6787"

PS C:\Windows\System32\WindowsPowerShell\v1.0> $destStorageAccountKey = Get-AzureStorageKey -StorageAccountName $destStorageAccountName |% {$_.Primary}

PS C:\Windows\System32\WindowsPowerShell\v1.0> $destStorageContext = New-AzureStorageContext -StorageAccountName $destStorageAccountName -StorageAccountKey $destStorageAccountKey

3.5 Create a storage container for the backups

To store the backups we’ll next create a storage container using the New-AzureStorageContainer cmdlet

New-AzureStorageContainer -Name "vmbackupstoragecontainer" `

-Permission Off `

-Context $destStorageContext

PS C:\Windows\System32\WindowsPowerShell\v1.0> New-AzureStorageContainer -Name "vmbackupstoragecontainer" -Permission Off -Context $destStorageContext

Blob End Point: https://vmbackupstorage6787.blob.core.windows.net/

Name PublicAccess LastModified

---- ------------ ------------

vmbackupstoragecontainer Off 6/11/2015 2:17:03 PM +00:00

3.6 Start backup process

Now we have the source and destination context available and a storage container created to store the backups, we can start the copy process by using the Start-AzureStorageBlobCopy cmdlet. Before performing the copy operation, we need to get the source blob and source container names. From the medialink property these values are addressable as http://.blob.core.windows.net//

$sourceUri = $osDisk.MediaLink.OriginalString

$sourceBlob = $sourceUri.Split('/')[-1]

$sourceContainer = $sourceUri.Split('/')[($sourceUri.Split('/').length - 2)]

PS C:\Windows\System32\WindowsPowerShell\v1.0> $sourceUri = $osDisk.MediaLink.OriginalString

PS C:\Windows\System32\WindowsPowerShell\v1.0> $sourceBlob = $sourceUri.Split('/')[-1]

PS C:\Windows\System32\WindowsPowerShell\v1.0> $sourceContainer = $sourceUri.Split('/')[($sourceUri.Split('/').length - 2)]

Before starting the copy process, we need to ensure that the VM is stopped.

$vmState = $azureVM | select -ExpandProperty PowerState

if($vmState -ne 'Stopped')

{

Stop-AzureVM -VM $azureVM -StayProvisioned

}

{

Start-Sleep -Seconds 5

$azureVM = Get-AzureVM -ServiceName $serviceName -Name $vmName

} while(($azureVM.InstanceStatus -eq 'ReadyRole') -and ($azureVM.PowerState -eq 'Started'))

Now we can use the State-AzureStorageBlobCopy cmdlet as

Start-AzureStorageBlobCopy -SrcBlob $sourceBlob `

-SrcContainer $sourceContainer `

-Context $sourceStorageContext `

-DestBlob "vmstoragebackup.vhd" `

-DestContainer "vmbackupstoragecontainer" `

-DestContext $destStorageContext

PS C:\Windows\System32\WindowsPowerShell\v1.0> Start-AzureStorageBlobCopy -SrcBlob $sourceBlob -SrcContainer $sourceContainer -Context $sourceStorageContext -DestBlob "vmstoragebackup.vhd" -DestContainer "vmbackupstoragecontainer" -DestContext $destStorageContext

Container Uri: https://vmbackupstorage6787.blob.core.windows.net/vmbackupstoragecontainer

Name BlobType Length ContentType LastModified SnapshotTime

---- -------- ------ ----------- ------------ ------------

vmstoragebackup.vhd PageBlob 136367309312 application/octet-stream 6/11/2015 2:40:18 PM +00:00

Once the copy begins it is completely asynchronous meaning you could immediately start other copy operations without waiting for the previous to complete. It is useful of course to determine the progress of your blob copy. This is made possible through the Get-AzureStorageBlobCopyState cmdlet

Get-AzureStorageBlobCopyState -Container vmbackupstoragecontainer `

-Blob vmstoragebackup.vhd `

-WaitForComplete `

-Context $destStorageContext

Note: If you have data disks then you need to copy the data disks also. Please note that while copying data disks you need to ensure that all the data disks are copied during the process.

Get-AzureDataDisk -VM $azureVM |% {

$sourceAccountName = ($_.MediaLink | select -ExpandProperty Host).Split('.')[0]

$sourceAccountKey = Get-AzureStorageKey -StorageAccountName $sourceAccountName |% {$_.Primary}

$sourceContext = New-AzureStorageContext -StorageAccountName $sourceAccountName -StorageAccountKey $sourceAccountKey

$destAccountName = "vmbackupstorage6787"

$destAccountKey = Get-AzureStorageKey -StorageAccountName $destAccountName |% {$_.Primary}

$destContext = New-AzureStorageContext -StorageAccountName $destAccountName `

-StorageAccountKey $destAccountKey

$uri = $_.MediaLink.OriginalString

$blob = $uri.Split('/')[-1]

$container = $uri.Split('/')[($uri.Split('/').length - 2)]

Start-AzureStorageBlobCopy -SrcBlob $blob `

-SrcContainer $container `

-Context $sourceContext `

-DestContainer "vmbackupstoragecontainer" `

-DestContext $destContext

Get-AzureStorageBlobCopyState -Container vmbackupstoragecontainer `

-WaitForComplete `

-Context $destContext

}

4 Restoring the VM backup

To restore the VM, we need to first get the VM instance as in the same case of creating the backup. To get the VM, you can use the Get-AzureVM cmdlet with the service name and virtual machine name

$azureVM = Get-AzureVM -ServiceName $serviceName -Name $vmName

Next we need to ensure that the virtual machine is stopped and stays provisioned.

$vmState = $azureVM | select -ExpandProperty PowerState

if($vmState -ne 'Stopped')

{

Stop-AzureVM -VM $azureVM -StayProvisioned

Write-Host "Stopping the Azure virtual machine"

{

Write-Host ".." -NoNewline -ForegroundColor Yellow

Start-Sleep -Seconds 5

$azureVM = Get-AzureVM -ServiceName $serviceName -Name $vmName

} while(($azureVM.InstanceStatus -eq 'ReadyRole') -and ($azureVM.PowerState -eq 'Started'))

Write-Host " "

Write-Host "Successfully stopped the Azure virtual machine" -ForegroundColor DarkGreen

}

4.1 Fetch the OS Disk and Data disks

Once we have the virtual machines stopped, we can now fetch the OS disk and data disks to restore to an old state

$osDisk = Get-AzureOSDisk -VM $azureVM

$dataDisks = Get-AzureDataDisk -VM $azureVM

PS C:\Windows\System32\WindowsPowerShell\v1.0> $osDisk = Get-AzureOSDisk -VM $azureVM

PS C:\Windows\System32\WindowsPowerShell\v1.0> $dataDisks = Get-AzureDataDisk -VM $azureVM

4.2 Removing the Virtual Machine

Before removing the virtual machine, it’s a good practice to export the virtual machine state to a file that we’ll use later. The Export-AzureVM cmdlet helps you export the state of a virtual machine to a file. The resulting file is a serialized version of your VM settings including endpoints, subnets, data disks and cache settings. We can use this information to easily recreate the same virtual machine in a new or existing cloud service.

To create a backup location we’ll use the New-Item cmdlet to create a directory to store the serialized file.

$vmConfigFolder = “C:\VMConfigs”

if (!(Test-Path –Path $vmConfigFolder))

{

New-Item –Path $vmConfigFolder –ItemType Directory

}

$vmExportPath = $vmConfigFolder + “\” + $azureVM.Name + “.xml”

Export-AzureVM –Path $vmExportPath -ServiceName $serviceName -Name $vmName

Now as we have the configuration backed up, we can safely remove the virtual machine by using the Remove-AzureVM cmdlet

$osDiskName = $osDisk.DiskName

$osDiskUri = $osDisk.MediaLink

$sourceStorageAccount = ($osDisk.MediaLink | select -ExpandProperty Host).Split('.')[0]

$sourceUri = $osDisk.MediaLink.OriginalString

$sourceBlob = $sourceUri.Split('/')[-1]

$sourceContainer = $sourceUri.Split('/')[($sourceUri.Split('/').length - 2)]

$destContainer = "vmbackupstoragecontainer"

Remove-AzureVM -ServiceName $serviceName -Name $vmName

Write-Host "Detaching the OS Disk"

{

Write-Host ".." -NoNewline -ForegroundColor Yellow

Start-Sleep 5

}While ( (Get-AzureDisk –DiskName $osDiskName).AttachedTo )

PS C:\> Remove-AzureVM -ServiceName $serviceName -Name $vmName

OperationDescription OperationId OperationStatus

-------------------- ----------- ---------------

Remove-AzureVM 5efc417c-c97b-a649-8cd2-e5cd1b9ef1e8 Succeeded

4.3 Removing the OS disk

After the disks are completely ditached from the virtual machine, you can now remove the disk using the Remove-AzureDisk cmdlet

Remove-AzureDisk –DiskName $osDiskName –DeleteVHD

PS C:\> Remove-AzureDisk –DiskName $osDiskName –DeleteVHD

OperationDescription OperationId OperationStatus

-------------------- ----------- ---------------

Remove-AzureDisk 387ed682-f185-ae47-95b6-c8b4a522fb78 Succeeded

4.4 Restore the disk data

Now we can perform the blob copy of the data from the destination container to the source container back, that we have created while creating the backup of the OS Disk. But before that we need to create the source and destination contexts using the cmdlets given below.

$sourceStorageAccountKey = Get-AzureStorageKey -StorageAccountName $sourceStorageAccount |% {$_.Primary}

$sourceStorageContext = New-AzureStorageContext -StorageAccountName $sourceStorageAccount -StorageAccountKey $sourceStorageAccountKey

$destStorageAccountName = "vmbackupstorage6787"

$destStorageAccountKey = Get-AzureStorageKey -StorageAccountName $destStorageAccountName |% {$_.Primary}

$destStorageContext = New-AzureStorageContext -StorageAccountName $destStorageAccountName `

-StorageAccountKey $destStorageAccountKey

PS C:\>

$sourceStorageAccountKey = Get-AzureStorageKey -StorageAccountName $sourceStorageAccount |% {$_.Primary}

$sourceStorageContext = New-AzureStorageContext -StorageAccountName $sourceStorageAccount -StorageAccountKey $sourceStorageAccountKey

$destStorageAccountName = "vmbackupstorage6787"

$destStorageAccountKey = Get-AzureStorageKey -StorageAccountName $destStorageAccountName |% {$_.Primary}

$destStorageContext = New-AzureStorageContext -StorageAccountName $destStorageAccountName `

-StorageAccountKey $destStorageAccountKey

PS C:\>

We need to perform the blob copy now reverse. That means the source and destination in the case of backup are reversed in this case.

Start-AzureStorageBlobCopy -SrcBlob "vmstoragebackup.vhd" `

-SrcContainer $destContainer `

-Context $destStorageContext `

-DestBlob $sourceBlob `

-DestContainer $sourceContainer `

-DestContext $sourceStorageContext

PS C:\> Start-AzureStorageBlobCopy -SrcBlob "vmstoragebackup.vhd" `

-SrcContainer $destContainer `

-Context $destStorageContext `

-DestBlob $sourceBlob `

-DestContainer $sourceContainer `

-DestContext $sourceStorageContext

Container Uri: https://devvm015.blob.core.windows.net/vhds

Name BlobType Length ContentType LastModified SnapshotTime

---- -------- ------ ----------- ------------ ------------

DevVS2015-p25312tj-DevVS2015-os-1432737990155.vhd PageBlob 136367309312 application/octet-stream 6/11/2015 7:21:25 PM +00:00

Get-AzureStorageBlobCopyState -Container $sourceContainer `

-Blob $sourceBlob `

-WaitForComplete `

-Context $sourceStorageContext

4.5 Re provision the azure vm

Once the copy is completed, you can now add the OS disk back and re provision the Azure VM by using the New-AzureVM cmdlet. We’ll make use of the configuration data that was exported before removing the VM to recreate the VM.

Add-AzureDisk –DiskName $osDiskName –MediaLocation $osDiskUri.AbsoluteUri –OS Windows

Import-AzureVM –Path $vmExportPath | New-AzureVM –ServiceName $serviceName -VNetName "Group DevVS2015GRP DevVS2015" -WaitForBoot

serviceName

Note: For the data disks, you need to follow the same approach we did while creating the backup. Iterate and restore. This should be done before importing the VM back.

PS C:\> Get-AzureVNetConfig -ExportToFile C:\VMConfigs\vnetConfigs.xml

XMLConfiguration

----------------

...

PS C:\> Import-AzureVM –Path $vmExportPath | New-AzureVM –ServiceName $serviceName -VNetName "Group DevVS2015GRP DevVS2015" -WaitForBoot

OperationDescription OperationId OperationStatus

-------------------- ----------- ---------------

New-AzureVM 2526e0c2-e2a8-b3e9-b061-08dc7e976ad1 Succeeded

PS C:\> Get-AzureVM

ServiceName Name Status

----------- ---- ------

ChefTestVM00 ChefTestVM00 StoppedDeallocated

DEVMachine-auyh2433 DEVMachine ReadyRole

DevVS2015-p25312tj DevVS2015 ReadyRole

Born to Automate

Friday, June 12, 2015

Managing snapshots on Azure Virtual machines

1 Introduction

2 Connecting to Azure Subscription

2.1 Associate storage account

3 Backup Azure VM Disks

3.1 Create storage context

3.2 Create the source storage context

3.3 Create destination storage account

3.4 Create the destination storage context

3.5 Create a storage container for the backups

3.6 Start backup process

4 Restoring the VM backup

4.1 Fetch the OS Disk and Data disks

4.2 Removing the Virtual Machine

4.3 Removing the OS disk

4.4 Restore the disk data

4.5 Re provision the azure vm

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