#################################################################################
# Power On the Powered Off VMs (poweronvms.ps1)
#
# This script is a partner script to the poweroffvms.ps1 script.  Basically this
# script will look at the csv file that was dumped by poweroffvms.ps1 and power
# on all of the VMs in the file.  It's meant to be run automatically on startup
# but don't worry, it won't always try and power things on, it only will go if
# the power off dump file exists.
#
# This script does have a 'partner' script that powers the VMs off, you can
# grab that script at http://blog.mwpreston.net/shares/
#
# Created By: Mike Preston, 2012 - With a whole lot of help from Eric Wright 
#                                  (@discoposse)
#
# Variables:  $vcenter - The IP/DNS of your vCenter Server
#             $username/password - credentials for your vCenter Server
#             $filename - name of the file that poweroffvms.ps1 dumps
#             $myImportantVMs - list of VMS to be powered on first
#
#
# Usage: ./poweronvms.ps1
#       
#
#################################################################################

Add-PSSnapin VMware.VimAutomation.Core

#some variables
$vcenter = "vCenterServer"
$username = "user"
$password = "Password"
$filename = "c:\path\to\poweredonguests.csv"
$myImportantVMs = "SQLSERVER01", "DHCPSERVER02"

#check if the power on file exists - if it does, then there was a power outage... or someone ran it manually GRRRRR
Write-Host "Checking to see if Power Off dump file exists....." -nonewline
Sleep 2
if (Test-Path $filename)
{
    Write-Host "File Found" -Foregroundcolor green
    Write-Host ""
    $date = ( get-date ).ToString('yyyyMMdd-HHmmss')
    #now we must check to see if vCenter service is running, if not, we need to wait....
    Write-Host "Checking for vCenter Service..." -nonewline
    Sleep 2
    while ((Get-Service vpxd).Status -ne "Running")
    {
        Write-Host "." -nonewline
        Sleep 2
        Write-Host "." -nonewline
        Sleep 2
        Write-Host "." -nonewline
        Sleep 2 
    }
    Write-Host "Service has Started!" -ForegroundColor Green 
    #connect to vcenter
    Sleep 5
    Write-Host "Connecting to vCenter Server..." -nonewline
    Sleep 3
    $success = Connect-VIServer $vcenter -username $username -Password $password
    if ($success) 
    { 
        Write-Host "Connected" -ForegroundColor Green 
    }
    else 
    { 
        Write-Host "ISSUES, aborting script" -Foregroundcolor Red 
        exit
    }
    Write-Host ""
    Write-Host "Starting the most important VMs first (Phase 1)" -ForegroundColor Green
    Write-Host ""
    foreach ($iVM in $myImportantVMs)
    {
        Write-Host "Powering on $iVM ..." -nonewline
        Start-VM $iVM
        Sleep 5
        Write-Host "DONE" -Foregroundcolor Green   
    }
    Write-Host ""
    Write-Host "Starting the remaining VMs" -ForegroundColor Green
    Write-Host ""
    #read file and start VMs every 5 seconds...
    $vms = Import-CSV $filename
    foreach ($vm in $vms)
    {
        $vmname = $vm.Name
        if ($myImportantVMs -notcontains $vmName)
        {
            Start-VM $vm.Name
            Write-Host "Powering on $vmName " 
            sleep 5
            Write-Host "DONE" 
        }
        else
        {
            Write-Host "Skipping $vmname - already powered on in phase 1" -Foregroundcolor yellow
        }
    }
    Write-Host "Power on completed, I will now rename the dump file...." -nonewline
    $DateStamp = get-date -uformat "%Y-%m-%d@%H-%M-%S"  
    $fileObj = get-item $fileName
    $extOnly = $fileObj.extension
    $nameOnly = $fileObj.Name.Replace( $fileObj.Extension,'')
    rename-item "$fileName" "$nameOnly-$DateStamp$extOnly"
    Write-Host "DONE" -foregroundcolor green
    Write-Host "File has been renamed to $nameOnly-$DateStamp$extOnly"   
}
else
{
    Write-Host "File Not Found - aborting..." -Foregroundcolor green
    exit
}