# **************************************************
#    XS-CreateSnapshotByTag.ps1
#
#    Author: Urs Heeb
#    Create: 27.03.2020
#
#    Note:   Enumerate all VMs with a specific Tag
#            and create a snapshot
#
#    Change: 27.03.2020 / uh / Script created
#            28.03.2020 / uh / Script modified for blog
#
# **************************************************

# Import SDK
Import-Module XenServerPSModule

# Define Variables
$Xenhost = "192.168.199.210"
$XenUser = "root"
$XenPW = "PITPassword"
$XenTag = "Citrix"
$BkpDate = Get-Date -Format yyyyMMdd-HHmm


# Connect to Citrix Hypervisor
# Try the defined host otherwise change to new PoolMaster
# --- Base scriptlet from pastebin.com ---

Try {
    $Session = Connect-XenServer -Url https://$Xenhost -UserName $XenUser -Password $XenPW -NoWarnCertificates -SetDefaultSession
    Write-Host -ForegroundColor DarkGreen "Successful connected to $Xenhost"
    }
    Catch [XenAPI.Failure]
        {
        [string]$PoolMaster = $_.Exception.ErrorDescription[1]  
        Write-Host -ForegroundColor Red "$($Pools.$Pool) is slave, Master was identified as $PoolMaster, trying to connect"
        $Pools.Pool = $PoolMaster
        $Session = Connect-XenServer -url "http://$PoolMaster" -UserName $XenUser -Password $XenPW -NoWarnCertificates -SetDefaultSession
        Write-Host -ForegroundColor DarkGreen "Successful connected to $PoolMaster"
       }


# Enumerate all VMs
# --- Base scriptlet from pastebin.com ---
# Added selection of Tag defined in the variables

$BkpVMs = Get-XenVM | Where {$_.is_a_template -eq $False -and $_.is_a_snapshot -eq $False -and $_.domid -ne 0 -and $_.tags -contains $XenTag}


# Create Snapshot of each found VM
# --- Base scriptlet from pastebin.com ---
# Loop added and define the snapshot name based on VM name and date/time of backup start

$BkpVMs | ForEach-Object {
    $VMName = $_.name_label
    $VMUuid = $_.uuid
    $Snapshotname = "$VMName - $BkpDate"
    Write-Host -ForegroundColor Gray "Snapshot with name $Snapshotname for VM $VMName (UUID $VMUuid ) will be created"
    Invoke-XenVM -Uuid $VMUuid -XenAction Snapshot -NewName $Snapshotname
    }