New-AzVM: Cannot attach an existing OS disk if the VM is created from a platform, user or a shared gallery image

[cadumi]

Description

Trying to delete an unmanaged disk VM and export it's properties as JSON and then recreate it, recreation fails with:

New-AzVM: Cannot attach an existing OS disk if the VM is created from a platform, user or a shared gallery image.
ErrorCode: InvalidParameter
ErrorMessage: Cannot attach an existing OS disk if the VM is created from a platform, user or a shared gallery image.
ErrorTarget: osDisk
StatusCode: 400
ReasonPhrase:
OperationID : 0de7d270-15e4-4650-9f1c-3d5fc1abd618

Issue script & Debug output

$rgname = "ReproRG" 
$vmname = "ReproRG"

Get-AzVM -ResourceGroupName $rgname -Name $vmname |ConvertTo-Json -depth 100|Out-file -FilePath .\$vmname.json
 
Remove-AzVM -ResourceGroupName $rgname -Name $vmname
 
    #Import from json
    $json = "$vmname.json"
    $import = gc $json -Raw|ConvertFrom-Json
    #Create variables for redeployment 
    $rgname = $import.ResourceGroupName
    $loc = $import.Location
    $vmsize = $import.HardwareProfile.VmSize
    $vmname = $import.Name
    #Create the vm config
    $vm = New-AzVMConfig -VMName $vmname -VMSize $vmsize
    #Network card info
    $importnicid = $import.NetworkProfile.NetworkInterfaces.Id
    $nicname = $importnicid.split("/")[-1]
    $nic = Get-AzNetworkInterface -Name $nicname -ResourceGroupName $rgname
    $nicId = $nic.Id
    $vm = Add-AzVMNetworkInterface -VM $vm -Id $nicId
    #OS Disk info
    $osDiskName = $import.StorageProfile.OsDisk.Name
    $osDiskVhdUri = $import.StorageProfile.OsDisk.Vhd.Uri
    $vm = Set-AzVMOSDisk -VM $vm -VhdUri $osDiskVhdUri -name $osDiskName -CreateOption attach -Linux -DeleteOption $import.StorageProfile.OsDisk.DeleteOption
    #$vm = Set-AzVMOSDisk -VM $vm -ManagedDiskId $import.StorageProfile.OsDisk.ManagedDisk.Id -StorageAccountType $import.StorageProfile.OsDisk.ManagedDisk.StorageAccountType -Name $osDiskName -CreateOption attach -Linux -DeleteOption $import.StorageProfile.OsDisk.DeleteOption
 
     
    #Create the VM
    New-AzVM -ResourceGroupName $rgname -Location $loc -VM $vm -Verbose

Environment data

$PSVersionTable     (Cloudshell)                                                                                                                                                              
                                                                                               
Name                           Value
----                           -----
PSVersion                      7.4.2
PSEdition                      Core
GitCommitId                    7.4.2
OS                             CBL-Mariner/Linux
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

PS C:\Windows\system32> $PSVersionTable (Local)

Name                           Value                                                                                                                                             
----                           -----                                                                                                                                             
PSVersion                      5.1.22621.2506                                                                                                                                    
PSEdition                      Desktop                                                                                                                                           
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                                                                                                                           
BuildVersion                   10.0.22621.2506                                                                                                                                   
CLRVersion                     4.0.30319.42000                                                                                                                                   
WSManStackVersion              3.0                                                                                                                                               
PSRemotingProtocolVersion      2.3                                                                                                                                               
SerializationVersion           1.1.0.1

Module versions

Get-Module Az* -Listavailable

7.3.0                 Az.Compute

Reproducible from Cloud Shell as well as local Powershell with Az Module installed.
No repro under old Az.Compute version 7.1.1.

Error output

Resolve-AzError -Last

   HistoryId: 26

RequestId      : 
Message        : Cannot attach an existing OS disk if the VM is created from a platform, user or a shared gallery image.
                 ErrorCode: InvalidParameter
                 ErrorMessage: Cannot attach an existing OS disk if the VM is created from a platform, user or a shared gallery image.
                 ErrorTarget: osDisk
                 StatusCode: 400
                 ReasonPhrase: 
                 OperationID : 0de7d270-15e4-4650-9f1c-3d5fc1abd618
ServerMessage  : 
ServerResponse : 
RequestMessage : 
InvocationInfo : {New-AzVM}
Line           :      New-AzVM -ResourceGroupName $rgname -Location $loc -VM $vm -Verbose
Position       : At line:1 char:6
                 +      New-AzVM -ResourceGroupName $rgname -Location $loc -VM $vm -Verb …
                 +      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
StackTrace     :    at Microsoft.Azure.Commands.Compute.ComputeClientBaseCmdlet.ExecuteClientAction(Action action)
                    at Microsoft.Azure.Commands.Compute.NewAzureVMCommand.DefaultExecuteCmdlet()
                    at Microsoft.Azure.Commands.Compute.NewAzureVMCommand.ExecuteCmdlet()
                    at Microsoft.WindowsAzure.Commands.Utilities.Common.CmdletExtensions.<>c__3`1.<ExecuteSynchronouslyOrAsJob>b__3_0(T c)
                    at Microsoft.WindowsAzure.Commands.Utilities.Common.CmdletExtensions.ExecuteSynchronouslyOrAsJob[T](T cmdlet, Action`1 executor)
                    at Microsoft.WindowsAzure.Commands.Utilities.Common.CmdletExtensions.ExecuteSynchronouslyOrAsJob[T](T cmdlet)
                    at Microsoft.WindowsAzure.Commands.Utilities.Common.AzurePSCmdlet.ProcessRecord()
HistoryId      : 26

[TravisCragg-MSFT]

@cadumi can I ask why you are doing this?

Unmanaged disks in Azure are on the path to deprecation and I would highly advise moving to manage disks.

I would also recommend recreating your VM from scratch and not by capturing the JSON. There are objects that might not exist.

[cadumi]

Hi Craig, While I can understand we are not investing time in products that will soon be decommissioned - I thought 1+year of support of Unmanaged disk might still need customers that are not ready yet to migrate to managed disk have the option to further create VMs with unmanaged disk… But probably using an old AzModule will be the only available option. Maybe we can just post this information.