Monday, February 15, 2016

vSphere template "convert to virtual machine" option grayed out

This is apparently an old bug. Seems to be triggered after vCenter and ESXi updates. You can read about it here: started in 2012

The KB 2037005 you will find is utterly useless - this is not a permissions issue and removing/re-adding the template can be very ineffective. The manual solution in the two links above is to deploy a VM and magically the option will reappear.

I did find however a better way, in a post from 2009! by Arne Fokkema

I can confirm this works. If you don't want to paste blindly, here are the related PowerCLI commands. Italics is a variable, inside brackets is a keystroke:

#Connect to a vCenter, it will prompt for your credentials or use AD integration
Connect-VIServer hostname [enter]

#Get a list of templates (more options, such as from a unique cluster, here
Get-Template [enter]

#Convert template to VM (again, remember it's not a permissions problem, this is just a bug)
Set-Template template_name -ToVM [enter]

You will now see a successful task in vCenter that converted the template to a VM. To move it back with Powershell, you will need a variable so you can use .MarkAsTemplate() instead of defining a template with New-Template

$vm_to_tpl = Get-VM template_name | Get-View [enter]
$vm_to_tpl.MarkAsTemplate() [enter]

#remove the variable you created, notice no $ sign
remove-variable vm_to_tpl [enter]

However, his script probably works perfectly fine and is a very automated way of doing it, so if you have a lot of them, customize it, test it, save it to a ps1 and watch the magic. 

I did remove Arne's -RunAsync from mine since I didn't want the possibility of the script to try to perform a task while the vCenter was still performing the conversion.

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