Azure PowerShell Runbook Get Set Az-Disk dynamically - azure

Question

The team is trying to automate a snapshot restore, which was achieved successfully. However I am not able to figure out how to dynamically get the previous disk within the resource group; As well as set the next disk with a new name.
In the code below "AZR-001_OsDisk_7" has to set dynamically to "AZR-001_OsDisk_8" the next time it runs:
$diskConfig = New-AzDiskConfig -Location $snapshot.Location -SourceResourceId $snapshot.Id -CreateOption Copy
$disk = New-AzDisk -Disk $diskConfig -ResourceGroupName "ETD-RFT" -DiskName "AZR-001_OsDisk_7"
$disk1 = Get-AzDisk -ResourceGroupName "ETD-RFT" -Name "AZR-001_OsDisk_7"

Answer 1

Not a final solution, but I have a quick idea. You may use Get-AzDisk -ResourceGroupName 'ResourceGroupName ' to get all the disks. And then you can get the disk name.
As you named the disk with appropriate rule, you may split the name string by _, then you will get a string array which contains all the parts. In this way, you will be able to get the version.
A sample:
$disks = Get-AzDisk -ResourceGroupName JackVS2019
foreach($disk in $disks){
$arr = $disk.Name.Split('_')
Write-Host $arr[2]
}
The output:
1
Then you can generate the new disk name.

Answer 2

$connectionName = "AzureRunAsConnection"
try
{
# Get the connection "AzureRunAsConnection "
$servicePrincipalConnection = Get-AutomationConnection -Name $connectionName
"Logging in to Azure..."
$account = Connect-AzAccount `
-ServicePrincipal `
-TenantId $servicePrincipalConnection.TenantId `
-ApplicationId $servicePrincipalConnection.ApplicationId `
-CertificateThumbprint $servicePrincipalConnection.CertificateThumbprint
}
catch {
if (!$servicePrincipalConnection)
{
$ErrorMessage = "Connection $connectionName not found."
throw $ErrorMessage
} else{
Write-Error -Message $_.Exception
throw $_.Exception
}
}
Select-AzSubscription -SubscriptionName 101-Prototyping
$vm = Get-AzVM -ResourceGroupName "ETD-RFT" -Name "AZR-101-007-001"
$snapshot = Get-AzSnapshot -ResourceGroupName "ETD-RFT" -SnapshotName "SNAPSHOT-DEC-2019"
$diskConfig = New-AzDiskConfig -Location $snapshot.Location -SourceResourceId $snapshot.Id -CreateOption Copy
$disks = Get-AzDisk -ResourceGroupName "ETD-RFT"
$attached = $disks | Where-Object ManagedBy -ne $null
foreach($disk in $attached)
{
$arr = $disk.Name.Split('_')
$arr[2]
}
$a = $arr[2] -as [int]
$a=$a+1
Write-Host $a
$newname = $arr[0] + "_" + $arr[1] + "_" + $a
$disknew = New-AzDisk -Disk $diskConfig -ResourceGroupName "ETD-RFT" -DiskName $newname
$disk1 = Get-AzDisk -ResourceGroupName "ETD-RFT" -Name $newname
Set-AzVMOSDisk -VM $vm -ManagedDiskId $disk1.Id -Name $disk1.Name
Update-AzVM -ResourceGroupName "ETD-RFT" -VM $vm