Script to update the XenDesktop MCS Pooled VDI.

Rad DavidPrincipal Project Manager
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This article describes how to update the XenDesktop Master Image Pooled machine types using PowerShell.

These commands are tested on XenDesktop 5.6 and VMware environment.

Like I said in my pervious article, “PowerShell is a very powerful scripting language that can help automate many aspects of maintaining and deploying a XenDesktop environment.”  This saves a lot of time for the Citrix administrators.

Whenever we run a powershell script or command first thing that we should do is to load the Citrix Snapins. If you do not have the Citrix snapins download it from http://www.citrix.com/downloads

Asnp Citrix.*

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This loads the Citrix-specific PowerShell modules. (Asnp means Add-PSSnapin).

Now let’s go with the steps to update the MCS Catalog with the updated master image.

Step 1: Modify the Master Virtual Machine or new virtual machine with the required changes.

Step 2: Take a snapshot of the modified virtual machine. 

New-HypVMSnapshot this command provides a mechanism for creating a new snapshot of a virtual machine given a Host Service provider path to a VM.
 
New-HypVMSnapshot -AdminAddress $XDServername -LiteralPath 'XDHyp:\VMPATH\VMNAME.vm' -SnapshotName "$filename" -SnapshotDescription "$description" 

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Step 3: Now to update the Catalog with the latest snapshot that was taken in the Step 2.  To get the last snapshot name use the command Get-ChildItem using the following syntax:
 
(Get-ChildItem -Recurse -path 'XDHyp:\HostingUnits\Path of the MasterImage.vm').PSPath 

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This command will list all the snapshots that are taken for the master VM.
To get the path of the Master VM use the command mentioned on Step 4.

Step 4: To get the Provisioning schema name, ProvisioningSchemeUid and the Master Image VM Path use the provscheme command. This command lets you retrieve the list of defined provisioning schemes.
 
provscheme -AdminAddress ‘$XDServerName’

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Step 5: Update the pooled catalog with the new master image using the command Publish-ProvMasterVmImage along with the Provisioning scheme Uid and the Master Image VM path, this command updates the master image associated with the provisioning scheme.
 
Publish-ProvMasterVmImage -AdminAddress ‘XDServername’ -ProvisioningSchemeUid 'Value’ -MasterImageVM ‘$VMname’

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Using all the above mention commands we will build a script to update the Pooled desktop.

To take the snapshot of the master image
 
#To take the snapshot of the master image
#Load The Citrix Snapins

Asnp Citrix.*

#Declare the variables

$XDserver = "Server Name"
$filename = "MasterImage_Snapshot_$(get-date -f MMM-d-yyyy-hh-mm)"
$description = "MasterImage_Sanpshot_$(get-date -f MMM-d-yyyy-hh-mm)"

# To take Snapshot of the Master VDI

New-HypVMSnapshot -AdminAddress '$XDserver' -LiteralPath 'XDHyp:\connections\Path of the VM\VMNAME.vm' -SnapshotName "$filename" -SnapshotDescription "$description" 

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 To Update the Pooled Catalog

#To update the Pooled Catalog

#Add the Citrix snap-ins

Asnp Citrix.*

#Variables declaration
$XDserver = "Server Name"
$ProvisioningSchemeUid = “ProvisioningSchemeUid”

#To get the Snapshot details - with the hosting unit
(Get-ChildItem -Recurse -path 'XDHyp:\Path\VMName.vm').PSPath > 'C:\temp\Snapshotdetails.txt'
$Snapshot = @(gc "C:\temp\Snapshotdetails.txt" | Select-Object -last 1)
$Snapshot = $Snapshot.trimstart("Citrix.Host.Admin.V1\Citrix.Hypervisor::")

# Update the Master Image details and update the catalog
Publish-ProvMasterVmImage -AdminAddress "$XDserver" -ProvisioningSchemeUid ‘$ProvisioningSchemeUid' -MasterImageVM $Snapshot

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Step 6: Reboot all the Pooled VDIs after the update is complete

Tested Environment
XenDesktop 5.6, PowerShell 3.0, Windows 7
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Rad DavidPrincipal Project Manager
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