In this blog post, I will show you how to create a virtual machine in Azure from an existing disk in an Azure storage account. This Azure RM PowerShell script is useful when you want to move your on-premises virtual machines to Azure. Before you can run this script, you would have to first copy your on-premises disks in vhd format to an Azure Storage Account. Image

In this example we will be using Azure Resource Manager to create a new virtual machine.

Log in to your Azure Account using the following command.



Copy the path of the existing Virtual Machine OS disk from the storage account.

$destinationVhd = ""

Define the Resource Group, Virtual Network and Location for the new virtual machine.

$rgName = "Azure-RG"
$virtualNetworkName = "Azure-VNetwork"
$locationName = "East US"

Create a Network Interface with a public IP Address to access the new VM.

$virtualNetwork = Get-AzureRmVirtualNetwork -ResourceGroupName $rgName -Name $virtualNetworkName
$publicIp = New-AzureRmPublicIpAddress -Name "dev11" -ResourceGroupName $rgName -Location 
$locationName -AllocationMethod Dynamic
$networkInterface = New-AzureRmNetworkInterface -ResourceGroupName $rgName -Name "dev11" -
Location $locationName -SubnetId $virtualNetwork.Subnets[1].Id -PublicIpAddressId $publicIp.Id

Set the virtual machine size by looking up the available virtual machine sizes for the location specified earlier.

Get-AzureRmVMSize $locationName | Out-GridView

We are now ready to create the VM.

$vmConfig = New-AzureRmVMConfig -VMName "DEV" -VMSize "Standard_DS1"
$vmConfig = Set-AzureRmVMOSDisk -VM $vmConfig -Name "DEV" -VhdUri $destinationVhd -CreateOption 
Attach -Windows
$vmConfig = Add-AzureRmVMNetworkInterface -VM $vmConfig -Id $networkInterface.Id
$vm = New-AzureRmVM -VM $vmConfig -Location $locationName -ResourceGroupName $rgName

How to attach an existing data disk to a VM

#attach existing datadisks to VM
$rgName = "Azure-RG"
$vmname = "DEV-VM"
$DataDiskUri = ""
$vmConfig=Get-AzurermVM -ResourceGroupName $rgname -Name $vmname
Add-AzureRMVMDataDisk -Name "DEV-VM-Data03" -VM $vmConfig -VhdUri $DataDiskUri -LUN 1 -Caching None -CreateOption Attach -DiskSizeInGB 1023
Update-AzureRmVM -ResourceGroupName $rgname -VM $vmConfig

Another scenario, where this script could be handy, is if you want to move an existing virtual machine in Azure to a different network. Azure does not let you move a VM to another network, so we have a to delete the existing VM and re-create it using its disks.