Reinstalling apps in MDT 2013 the easy way

Haven’t been this excited about finding a new trick in MDT for a while, so bear with me, this is going to be a long post. I really like this as it adds a whole new level of automation to a strictly MDT lite touch environment that’s minus Config Manager, which is perfect since this is after all, an MDT blog.

MDT is great in bare metal scenarios. That is to say, “Here’s an order of 500 brand new computers, get them ready!” MDT can do that easily. Now, what most deployment pros also know is that where MDT really shines is in refresh scenarios. That is to say, “Here’s an entire organization that needs to be moved to a new version of windows” or even just standardized to a newer image. MDT can detect and reinstall apps dynamically as well.

So, in this hypothetical refresh scenario everyone’s getting an image with windows, office, the core line of business apps, and that’s all in the image, but only half of the users use Adobe Acrobat Pro and there’s a mix of users who use other one-off applications. Now, one could go about using the lite touch option to select these additional supplemental applications in the lite touch menus prior to deployment, but do you want to inventory every device?

Now, I’ve known for a while that in theory one could go about using complicated scripts, bundles or the MDT database, but yesterday I stumbled across this gem and a lightbulb went off. While I had looked into this before in the past, it involved manually creating GUID lists or writing queries and the amount of work needed didn’t look like it would be worth the hassle, but this method is really the easiest as long as we’re talking about an MSI, because while you could in theory also use a WMIC query, who’s got time for that?

So, here’s the quick rundown:

  • Some (not all) users have an application like Adobe Acrobat Pro installed
  • You’ll need to have the MSI that’s installed on the user’s PCs to show MDT
  • Create a step in the State Capture phase that sets a TS variable called AcrobatInstalled to true
  • Use a this to only set if it detects the GUID for the MSI that’s used to install Acrobat
  • During the State Restore, if the task sequence variable is set to true it will run the install for Acrobat.

Of course, this may not work during ‘offline’ migrations from PXE, or USB, so I’ll have to most likely go over refresh scenarios where we’re running from within windows.

Lots of people use MDT almost exclusively from PXE or ISO, but you really almost never need to do it that way, MDT can be run from the UNC path from within windows itself. (PXE is criminally over-rated and really only necessary when you’re imaging bare metal or a crashed PC that wont boot)

Browsing to the \\MDTSERVERNAME\ShareName$\Scripts folder, you’ll see litetouch.vbs, kick that off and you’ll get the wizard to run. This is how I kick off 99% of my refreshes. You can even pass switches to this vbs via shortcuts to include or exclude prompts in the wizard. More on that in a later post.

STEP BY STEP: How to get MDT to detect an app and reinstall it during a refresh:

Step One:
1
Add a step to the task sequence that detects for product in the Capture State
Step Two:
2
This step creates a task sequence variable and sets it to true if application is detected
Step Three:
3
Add a step to the task sequence that installs product in the State Restore
Step Four:
4
This step runs only if it detects the variable as set as true

This could be used to call not just one app, but a bundle if you wanted, however you wouldn’t want to do this for every single app, as this trick is best for something that’s on 20-45% range of your user base (like acrobat pro). This wouldn’t replace Desktop or Laptop bundles either, but it will however allow you to bring a whole new level of automation to the supplemental applications installed in your environment.

Questions? Comments? Hit me up in the Contact Me page.

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