How to get Azure VM operating sytsem detail version by Powershell

Question

Because our vender provides customized image, so the below Get-AzVM can't get OS version.
$VM = Get-AzVM -Name $VMName
$VM.StorageProfile.ImageReference

I find the below way for Linux,
$CommandId = 'RunShellScript'
$ScriptPath = ".\RemoteCommand\Get-RHELVersion.sh"
$Result = Invoke-AzVMRunCommand -ResourceGroupName $ResourceGroupName -VMName $VMName -CommandId $CommandId -ScriptPath $ScriptPath -ErrorAction Stop

$Result | ConvertTo-Json
$OSMessage = $Result.Value[0].Message
$StartPos = $OSMessage.IndexOf("Red Hat Enterprise Linux Server") + 32
$OSLength = $OSMessage.IndexOf("`n CPE OS Name") - $StartPos
$Version = $OSMessage.Substring($StartPos, 3)

Get-RHELVersion.sh contains only one command: hostnamectl
Is the above OK?
I have big concern that the RunCommand will impact the VM, that means bring huge risk to Production VM.
Any better solution?

Answer 1

Hi @Mike Zhang

Try with the below script to get OS type.

$reportName = "myReport.csv"  
  
$report = @()  
$vms = Get-AzVM  
$publicIps = Get-AzPublicIpAddress   
$nics = Get-AzNetworkInterface | ?{ $_.VirtualMachine -NE $null}   
foreach ($nic in $nics) {   
    $info = "" | Select VmName, ResourceGroupName, Region, VirturalNetwork, Subnet, PrivateIpAddress, OsType, PublicIPAddress   
    $vm = $vms | ? -Property Id -eq $nic.VirtualMachine.id   
    foreach($publicIp in $publicIps) {   
        if($nic.IpConfigurations.id -eq $publicIp.ipconfiguration.Id) {  
            $info.PublicIPAddress = $publicIp.ipaddress  
            }   
        }   
        $info.OsType = $vm.StorageProfile.OsDisk.OsType   
        $info.VMName = $vm.Name   
        $info.ResourceGroupName = $vm.ResourceGroupName   
        $info.Region = $vm.Location   
        $info.VirturalNetwork = $nic.IpConfigurations.subnet.Id.Split("/")[-3]   
        $info.Subnet = $nic.IpConfigurations.subnet.Id.Split("/")[-1]   
        $info.PrivateIpAddress = $nic.IpConfigurations.PrivateIpAddress   
        $report+=$info   
    }   
$report | ft VmName, ResourceGroupName, Region, VirturalNetwork, Subnet, PrivateIpAddress, OsType, PublicIPAddress   
$report | Export-CSV "$home/$reportName"  

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