Wednesday Tidbit: Automate VMware OSOT for your VDI Images

The other day I tweeted a short bit of code on how to automate the zeroing-out of your VDI images using SDelete:

I got quite a few DMs afterwards asking if it was possible to do the same with VMware’s OS Optimization Tool.

So without further ado, here’s the code I use as the last step in my Packer builds before closing them down for svMotioning:

$ErrorActionPreference = "Stop"
$webserver = "webserver.contoso.local"
$url = "http://" + $webserver
$files = @("VMwareOSOptimizationTool.exe","VMwareOSOptimizationTool.exe.config","my_osot.xml")
$exe = $files[0]
$arg = "-o -t " + $files[2]
# Verify connectivity
if (Test-Connection $webserver Quiet){
# Get the OSOT files
ForEach ($file in $files)
Invoke-WebRequest Uri ($url + "/" + $file) OutFile $env:TEMP\$file
} else {
throw "No connection to server. Aborting."
# Change to temp folder
Set-Location $env:TEMP
# Run OSOT
Start-Process $exe ArgumentList $arg Passthru Wait ErrorAction stop
Write-Error "Failed to run OSOT"
Write-Error $_.Exception
Exit -1
# Delete files
ForEach ($file in $files)
Remove-Item Path $env:TEMP\$file Confirm:$false

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Please remember to swap out your web server and to specify your own XML file. You could also YOLO it and use one of the built-in templates…

Bill OReilly Well Do It Live GIF - BillOReilly WellDoItLive Mad GIFs

…but don’t be surprised when you cripple half your apps 🙂