For our test environment we need to rollback to a snapshot(default) every evening. I don’t like to do that by hand so lets create a script.
The second point it has to be run as a scheduled task and I don’t want to parse my credentials within the script as plain text.

First of all
On the machine that has to run the task, create the credentials file:
From the PowerShell command run New-VICredentialStoreItem -host ‘vccenter’ -user ‘marcus’ -password ‘garvey’ -file c:\vc_cred

Getting the credentials:
$creds = Get-VICredentialStoreItem -file c:\vc_cred

so in code it will end up as:

###################################################################
#
# ReverseToSnapshot.ps1
#
# -Get stored credentials
# -Connect to vCenter
# -Shutdown Virtual machine
# -Set to required snapshot
# -Remove other snapshots
# -Start Virtual machine again
#
# Example:
# .\ReverseToSnapshot.ps1 -vmname TIIS01.domain.com -snapshotsname Do-Not-Remove-Default
# Version 1.0 juni 2010 JW Nieuwenhuizen ict.myjewe.nl
#
####################################################################

param(
    [parameter(Mandatory = $true)]
    [string]$vmname,
    [string]$snapshotsname
)

function PowerOff-VM{
    param([string] $vm)
        if((Get-VM $vm).powerstate -eq “PoweredOff”){
        Write-Host “$vm is already powered off”}
        else{
    Shutdown-VMGuest -VM (Get-VM $vm) -Confirm:$false | Out-Null
    Write-Host “Shutdown $vm”
    do {
        $status = (get-VM $vm).PowerState
    }until($status -eq “PoweredOff”)
    }
}

function PowerOn-VM{
    param( [string] $vm)
    if((Get-VM $vm).powerstate -eq “PoweredOn”){
        Write-Host “$vm is already powered on”}
    else{
        Start-VM -VM (Get-VM $vm) -Confirm:$false | Out-Null
        Write-Host “Starting $vm”
        do {
            $status = (Get-vm $vm | Get-View).Guest.ToolsRunningStatus
        }until($status -eq “guestToolsRunning”)
    }
}

function Remove-Snapshot-VM{
    param( [string] $vm, [string] $vm1)
    $snaps = Get-Snapshot -VM (Get-VM -Name $vm)
    foreach ($snappie in $snaps)
    {
        if ($snappie.Name -eq $vm1){
        Write-Host “This one we need again $vm1″}
        else{
        Get-Snapshot -VM (Get-VM -Name $vm) -Name $snappie.Name | Remove-Snapshot -Confirm:$false | Out-Null
        }
    }
}

#######################################################################################
# Main script
#######################################################################################
# Import VimAutomation.Core to run from a “normal” powershell prompt
add-pssnapin VMware.VimAutomation.Core

# Get and Decript credentials and Connect vcenter Using AD credentials
$creds = Get-VICredentialStoreItem -file c:\vc_cred
    foreach ($item in $creds){
    Connect-VIServer -Server $item.Host-User $item.User -Password $item.Password
}

$poweroff = PowerOff-VM $vmname

# Set Snapshot name
$snapname = Get-Snapshot -VM (Get-VM -Name $vmname) -Name $snapshotsname
# Set VM to snapshot
Set-VM -VM $vmname -Snapshot $snapname -confirm:$false

$removesnap = Remove-Snapshot-VM $vmname $snapshotsname
$poweron = PowerOn-VM $vmname

Disconnect-VIServer -Confirm:$False

Thanks to A Fokkema and baars.it and secure-credential-storage

Posted in Esx4 PowerShell VMWare
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