How to revert virtual machines in your lab

Last week I attented a Microsoft training on Windows 8 (22688A) in a local training center.

I wrote a few lines of code at the beginning of the session to revert a specific VM to its initial state as we had to repeat this task at the end of each lab.

Get-VM -Name 22688A-LON-CL1 |
Get-VMSnapshot | Sort CreationTime |
Out-GridView -PassThru |
Restore-VMSnapshot -Confirm:$false -Passthru -Verbose |
ForEach-Object -Process {
	Start-VM -Name $_.VMName -Verbose

When you revert a VM to its initial state, the trust relationship with its domain is broken. The password of the computer needs just to be reset.

I didn’t use the Test-ComputerSecureChannel although it was quickly mentioned at the end of chapter 3.

Test-ComputerSecureChannel -Repair:$true

As we log on the client computer with domain admin credentials (a very bad practice), I just did:

Notice that no reboot is required 😀

Both Test-ComputerSecureChannel and Reset-ComputerMachinePassword exist in Powershell 2.0 but as of version 3.0, you’ve now the ability to specify credentials used to perform the reset. Very handy, isn’t it?

At the end of the week to revert all the virtual machines, I used the following code 😎

Get-VM | Out-GridView -PassThru -Title "Select Virtual Machines" | % {            
    $_ | Get-VMSnapshot | Sort CreationTime |             
    Out-GridView -PassThru -Title "Select one snapshot for $($_.Name)"            
} | Restore-VMSnapshot -Confirm:$false -PassThru -Verbose

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