Script Extracts and Examples (PowerCLI): Difference between revisions

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Name            : Network Adapter 3
Name            : Network Adapter 3
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=== Installed Version ===
To determine the version of PowerCLI currently installed use;
* <code> Get-PowerCLIversion </code>


== Useful CmdLets etc ==
== Useful CmdLets etc ==

Revision as of 08:53, 18 August 2010

Getting Started

Before being able to use any the following script you need to install...

On the first run you need to allow the Toolkit to run properly by running (you need to run this command as an administrator, so if you're using Windows 7, for example, you'll need to start the Powershell console as an administrator, regardless of whether you're currently logged in as an admin)... 

 Set-ExecutionPolicy RemoteSigned

Connect to the Virtual Centre (or ESX) server using the following command using your normal username and password (same as you'd use to log into the VI Client). You will need access to the servers on TCP 443. 

 Connect-VIServer -Server <server> -User <user> -Password <pass>

Once connected you can do real work with the PowerCLI, to see what's available, login to https://server/mob. This is effectively where you end up once you've completed the Connect-VIServer command.

Be aware that PowerShell commands generally return objects, rather than text, and that the textual representation of the return object is often abbreviated for simplicity. To see the entire return for a command, pipe the result into Format-List. To complicate matters further, some return objects contain further objects, see examples below 

[vSphere PowerCLI] E:\> get-vm -name "vserver1"

Name                 PowerState Num CPUs Memory (MB)
----                 ---------- -------- -----------
vserver1               PoweredOn  1        756


[vSphere PowerCLI] E:\> get-vm -name "vserver1" | Format-List *

PowerState          : PoweredOn
Description         :
Guest               : VMware.VimAutomation.Client20.VMGuestImpl
NumCpu              : 1
MemoryMB            : 756
CDDrives            : {CD/DVD Drive 1}
FloppyDrives        : {Floppy Drive 1}
HardDisks           : {Hard Disk 1}
NetworkAdapters     : {Network Adapter 1}
Host                : esx1.domain.com
HostId              : HostSystem-host-301
HARestartPriority   : ClusterRestartPriority
HAIsolationResponse : AsSpecifiedByCluster
DrsAutomationLevel  : AsSpecifiedByCluster
CustomFields        : {}
Id                  : VirtualMachine-vm-25136
Name                : vserver1


[vSphere PowerCLI] E:\> get-vm -name "vserver2" | Format-List *

PowerState          : PoweredOff
Description         :
Guest               : VMware.VimAutomation.Client20.VMGuestImpl
NumCpu              : 2
MemoryMB            : 2048
CDDrives            : {CD/DVD Drive 1}
FloppyDrives        : {Floppy Drive 1}
HardDisks           : {Hard Disk 1}
NetworkAdapters     : {Network Adapter 1, Network Adapter 2, Network Adapter 3}
Host                : vserver2.domain.com
HostId              : HostSystem-host-662
HARestartPriority   : ClusterRestartPriority
HAIsolationResponse : AsSpecifiedByCluster
DrsAutomationLevel  : AsSpecifiedByCluster
CustomFields        : {}
Id                  : VirtualMachine-vm-697
Name                : vserver2


[vSphere PowerCLI] E:\> get-vm -name "vserver2" | ForEach-Object {$_.NetworkAdapters}

MacAddress       : 00:50:AB:CD:40:59
WakeOnLanEnabled : True
NetworkName      : Some_Network
Type             : Flexible
ConnectionState  : VMware.VimAutomation.Client20.ConnectInfoImpl
Id               : VirtualMachine-vm-697/4000
Name             : Network Adapter 1

MacAddress       : 00:50:AB:CD:55:40
WakeOnLanEnabled : True
NetworkName      : Another_Network
Type             : Flexible
ConnectionState  : VMware.VimAutomation.Client20.ConnectInfoImpl
Id               : VirtualMachine-vm-697/4001
Name             : Network Adapter 2

MacAddress       : 00:50:AB:CD:56:da
WakeOnLanEnabled : True
NetworkName      : Yet_Another_Network
Type             : Flexible
ConnectionState  : VMware.VimAutomation.Client20.ConnectInfoImpl
Id               : VirtualMachine-vm-697/4002
Name             : Network Adapter 3

Installed Version

To determine the version of PowerCLI currently installed use;

  • Get-PowerCLIversion

Useful CmdLets etc

Virtual Machine

Command Description
get-vm Get list of VM's
get-vm | sort -property Name Get list of VM's, sorted by name
get-vm -name "MyVM" -location (Get-Folder -Name "MyFolder") Get VM within a specific folder (for when you've VM's with identical names if different folders)
get-vmguest -VM (get-vm -name "vserver1") Get VM guest info (IP address, OS)
Get-VM "vserver1" | %{(Get-View $_.Id).config.uuid} Get VM's UUID
Get-VM "MyVM" | Move-VM -datastore (Get-datastore "DestinationDatastore") Storage VMotion
Shutdown-VMGuest -VM (get-vm -name "vserver1") Sends OS shutdown command via VM Tools
get-VM "vserver1" | Get-VIEvent | Where {$_.fullFormattedMessage -like "*Power*"} Get Power On/Off events for VM

ESX Host

Command Description
get-vmhost -name MyESX* | %{(Get-View $_.ID).Config.Product} Get ESX software version (inc build no)
Get-ScsiLun -VMHost MyESX* -LunType disk Get ESX disk VML ID's (SAN ID are a part of the VML - useful for identifying LUN's with SAN team). See ESX SAN LUN ID
Get-ScsiLun -VMHost MyESX* -LunType disk | Get-ScsiLunPath Get ESX SCSI paths info
Get-VMHostHba -VMHost MyESX* | Where {$_.Type -eq "FibreChannel"} | Format-List * Get ESX Fibre Channel HBA info

ESXi Logs

Command Description
Get-Log -VMHost (Get-VMHost "MyESX*") -Bundle -DestinationPath C:\Users\name Generate diagnostic bundle
Get-Log vpxa -VMHost (Get-VMHost "MyESX*") | Select -ExpandProperty Entries Get vpxa log
Get-Log messages -VMHost (Get-VMHost "MyESX*") | Select -ExpandProperty Entries Get messages log
Get-Log hostd -VMHost (Get-VMHost "MyESX*") -StartLineNum 1000 -NumLines 100 | Select -ExpandProperty Entries Get hostd log from line 1000
Get-Log hostd -VMHost (Get-VMHost "MyESX*") | Select -Expand Entries | Select-String FindMe Get hostd log entries that include FindMe
Get-Log hostd -VMHost (Get-VMHost "MyESX*") | Select -Expand Entries | Out-GridView Dump hostd log into GridView

Storage

Command Description
get-vm -name "MyVM" | get-harddisk | Format-List Get the vHD details for a particular VM
(Get-VM -name "MyVM" | Get-VMGuest).Disks Get the HD details for a particular VM (as seen from within guest OS)
get-vm -Location (Get-Folder -Name "MyFolder") | get-harddisk | sort-object -Property Filename Get the vHD details for all VM’s in a folder (sorted by VMDK path)
New-PSDrive -Name DS -PSProvider ViMdatastore -Root '\' -location (Get-Datastore MyDatastore) Create a PowerShell drive for the MyDatastore datastore
Copy-DatastoreItem C:\Temp\FileToUpload.vmdk -Destination DS:\VMFolder\ Upload file to datastore (a PowerShell drive needs to be create 1st - see above)

Performance Statistics

The full wealth of performance metrics that are collated by virtual centre are available via the PowerCLI. This can be very useful for creating custom reports, feeding data into other tools etc.

It's important to understand how ESX's generate and manage performance data before going any further...

  1. An ESX collects performance metrics every 20 sec (know as the Realtime interval), this is retained on the server for 1 hour.
  2. The ESX rolls the Realtime data up into 5 min interval data
    • [Stand-alone ESX] This 5 min data is retained for 1 day
    • [VC managed ESX] The data is uploaded to the VC database

Once in the Virtual Centre database, the data is then rolled up into Historical Interval tables via SQL jobs...

  • 5 min interval, 1 day retention
  • 30 min interval, 1 week retention
  • 2 hr interval, 1 month retention
  • 1 day interval, 1 year retention

Note that the following are configurable (to a varying degree) via the VI Client.

  • The VC rollup intervals and retention periods
  • The statistics depth (typically certain metrics are discarded as the retention period grows)

To see the available intervals for which metrics are available, use the following command (the results will vary depending on whether you're connected to an ESX or a Virtual Centre). 

[vSphere PowerCLI] E:\> Get-StatInterval

Name                           SamplingPeriodSecs          StorageTimeSecs Client
----                           ------------------          --------------- ------
Past Day                                      300                    86400 VMware.VimAutomation....
Past Week                                    1800                   604800 VMware.VimAutomation....
Past Month                                   7200                  2592000 VMware.VimAutomation....
Past Year                                   86400                 31536000 VMware.VimAutomation....

Available Metrics

Metrics are available for all objects you'd expect (and probably more), not limited to the following...

  • Virtual Machines
  • Virtual machines Hosts (ESX's)
  • Resource Pools
  • Datastores

For a full list of what objects have what performance counters, and what those counters mean see http://www.vmware.com/support/developer/vc-sdk/visdk400pubs/ReferenceGuide/vim.PerformanceManager.html.

The easiest way to ascertain what metric is available for what object is to use Get-StatType... 

[vSphere PowerCLI] E:\> Get-VM "vm-server" | Get-StatType
cpu.usage.average
cpu.usagemhz.average
mem.usage.average
mem.granted.average
mem.active.average
...

[vSphere PowerCLI] E:\> Get-VMHost "esx-server*" | Get-StatType
cpu.usage.average
cpu.usagemhz.average
mem.usage.average
mem.granted.average
mem.active.average
mem.shared.average
mem.zero.average
mem.unreserved.average
...

In order to determine which sampling periods are available, you need to use the Get-StatInterval command. Remember that there is also the Realtime interval, at which all metrics are available. The results depend on whether you're connected to a Virtual Centre (and how its configured) or an ESX (and whether that's being managed by a VC)... 

[vSphere PowerCLI] E:\> Get-StatInterval

Name                           SamplingPeriodSecs          StorageTimeSecs Client
----                           ------------------          --------------- ------
Past Day                                      300                    86400 VMware.VimAutomation....
Past Week                                    1800                   604800 VMware.VimAutomation....
Past Month                                   7200                  2592000 VMware.VimAutomation....
Past Year                                   86400                 31536000 VMware.VimAutomation....

However, just because a metric is available, doesn't make it available in the interval you'd like. In order to find out whether a statistic is available in the interval you'd like, you need to use the Get-StatType -Interval <secs/name> ... 

[vSphere PowerCLI] E:\> Get-VMHost "esx-server*" | Get-Stat -MaxSamples 5 -IntervalSecs 300


MetricId                  Timestamp                                Value Unit
---------                 ----------                               ----- ----
cpu.usage.average         19/01/2010 09:15:00                       7.64 %
cpu.usage.average         19/01/2010 09:10:00                        6.5 %
cpu.usage.average         19/01/2010 09:05:00                       6.37 %
cpu.usage.average         19/01/2010 09:00:00                       6.39 %
cpu.usage.average         19/01/2010 08:55:00                       6.35 %
cpu.usagemhz.average      19/01/2010 09:15:00                        813 MHz
cpu.usagemhz.average      19/01/2010 09:10:00                        692 MHz
cpu.usagemhz.average      19/01/2010 09:05:00                        678 MHz
cpu.usagemhz.average      19/01/2010 09:00:00                        680 MHz
cpu.usagemhz.average      19/01/2010 08:55:00                        676 MHz
mem.usage.average         19/01/2010 09:15:00                      24.89 %
mem.usage.average         19/01/2010 09:10:00                      24.88 %
mem.usage.average         19/01/2010 09:05:00                      24.89 %
mem.usage.average         19/01/2010 09:00:00                       24.9 %
mem.usage.average         19/01/2010 08:55:00                      24.91 %
disk.usage.average        19/01/2010 09:15:00                        156 KBps
disk.usage.average        19/01/2010 09:10:00                        124 KBps
disk.usage.average        19/01/2010 09:05:00                        131 KBps
disk.usage.average        19/01/2010 09:00:00                        126 KBps
disk.usage.average        19/01/2010 08:55:00                        136 KBps
net.usage.average         19/01/2010 09:15:00                          7 KBps
net.usage.average         19/01/2010 09:10:00                          8 KBps
net.usage.average         19/01/2010 09:05:00                          7 KBps
net.usage.average         19/01/2010 09:00:00                          7 KBps
net.usage.average         19/01/2010 08:55:00                          7 KBps
sys.uptime.latest         19/01/2010 09:15:00                    5173577 second
sys.uptime.latest         19/01/2010 09:10:00                    5173277 second
sys.uptime.latest         19/01/2010 09:05:00                    5172977 second
sys.uptime.latest         19/01/2010 09:00:00                    5172677 second
sys.uptime.latest         19/01/2010 08:55:00                    5172376 second

A couple of final points to note

  • To retrieve data for the Realtime interval, use the -Realtime option, not -IntervalSecs 20
    • All Realtime metrics are averages (as they're an average over the sampling period)
  • Virtual Centre generally drops metrics during roll-ups etc (subject to configuration), therefore for the fullest range of metrics, use the Realtime interval.
    • I'd suggest always trying to go via the Virtual Centre, but the data you're after isn't available, check with the ESX direct.
  • Be careful when retrieving metrics that might have multiple instances (eg CPU), this is relatively obvious in vSphere as it'll show an instance column, not so in VI3. You can filter so as to see, for example, only the aggregate instance 
    • get-vmhost "esx-server*" | get-stat -Stat cpu.usage.average -MaxSamples 1 -Realtime | Where{$_.Instance -eq ""}

Script Extracts

VM's with Datastores List

List of Virtual Machines, and their datastores (with usage) 

$datastoreExp = @{N="Datastore"; E={ ($_ | get-datastore | select-object -first 1).Name }}
$diskSizeExp = @{N="Total Disk"; E={ ($_ | get-harddisk | measure-object -property CapacityKB -sum).Sum }}
get-vm | select Name, $datastoreExp, $diskSizeExp | sort -property Datastore,"Total Disk"

VM's with Host and Cluster List

$vms = Get-VM | sort -property Name
foreach ($vm in $vms)
{
     $vm | Get-Cluster | Select-Object @{Name="VM"; Expression={$vm.name}},@{Name="Current Host"; Expression={$vm.host}},Name
}

VM's Inventory CSV

$start = Get-Date

# Create table for output
# Name	DC	OS	UUID	IP	Cluster		ESX's

$table = New-Object system.Data.DataTable "Results"

$col1 = New-Object system.Data.DataColumn Name,([string])
$col2 = New-Object system.Data.DataColumn DC,([string])
$col3 = New-Object system.Data.DataColumn OS,([string])
$col4 = New-Object system.Data.DataColumn UUID,([string])
$col5 = New-Object system.Data.DataColumn MgmtIP,([string])
$col6 = New-Object system.Data.DataColumn Cluster,([string])
#$col7 = New-Object system.Data.DataColumn ESXs,([string])

$table.columns.add($col1)
$table.columns.add($col2)
$table.columns.add($col3)
$table.columns.add($col4)
$table.columns.add($col5)
$table.columns.add($col6)
#$table.columns.add($col7)

$duration = (New-TimeSpan $start (Get-Date)).TotalSeconds
"Created table after $duration secs"

# Get VMs object
$vms = Get-VM | Sort -property Name

$duration = (New-TimeSpan $start (Get-Date)).TotalSeconds
"Got object list of VM's after $duration secs"

foreach ($vm in $vms)
{
	$row = $table.NewRow()
	
	$row.Name = (Get-VM -Name $vm).Name
	$row.DC = (Get-Datacenter -VM $vm).Name
	$row.OS = (Get-VMGuest -VM $vm).OSFullName
	$row.UUID = %{(Get-View $vm.Id).config.uuid}
	$row.MgmtIP =  [string]::join(" ", ((Get-VMGuest -VM $vm).IPAddress))			# Need to join potential list of IP's
	$row.Cluster = (Get-Cluster -VM $vm).Name
	
	$table.Rows.Add($row)
	"Added row for $vm"
}

$duration = (New-TimeSpan $start (Get-Date)).TotalSeconds
"Populated table after $duration secs"

$table | Format-Table
$table | Export-Csv -path result.csv

VM Storage Usage

Total storage usage (including any snapshots, logs, etc, etc), not just the VMDK files. Adapted from post by Arnim van Lieshout http://www.van-lieshout.com/2009/07/how-big-is-my-vm/ 

function Get-VMDiskUsage($vm2do)
{
    #Initialize variables
    $VMDirs =@()
    $VMSize = 0

    $searchSpec = New-Object VMware.Vim.HostDatastoreBrowserSearchSpec
    $searchSpec.details = New-Object VMware.Vim.FileQueryFlags
    $searchSpec.details.fileSize = $TRUE

    Get-View -VIObject $vm2do | % {
        #Create an array with the vm's directories
        $VMDirs += $_.Config.Files.VmPathName.split("/")[0]
        $VMDirs += $_.Config.Files.SnapshotDirectory.split("/")[0]
        $VMDirs += $_.Config.Files.SuspendDirectory.split("/")[0]
        $VMDirs += $_.Config.Files.LogDirectory.split("/")[0]
        #Add directories of the vm's virtual disk files
        foreach ($disk in $_.Layout.Disk) {
            foreach ($diskfile in $disk.diskfile){
                $VMDirs += $diskfile.split("/")[0]
            }
        }
        #Only take unique array items
        $VMDirs = $VMDirs | Sort | Get-Unique

        foreach ($dir in $VMDirs){
            $ds = Get-Datastore ($dir.split("[")[1]).split("]")[0]
            $dsb = Get-View (($ds | get-view).Browser)
            $taskMoRef  = $dsb.SearchDatastoreSubFolders_Task($dir,$searchSpec)
            $task = Get-View $taskMoRef 

            while($task.Info.State -eq "running" -or $task.Info.State -eq "queued"){$task = Get-View $taskMoRef }
            foreach ($result in $task.Info.Result){
                foreach ($file in $result.File){
                    $VMSize += $file.FileSize
                }
            }
        }
    }

    # VM disk usage in GB
    $VMSize/1048576000
}
Get-VMDiskUsage (Get-VM "MyVM")

VM's Effective CPU Shares

Calculates the effective relative CPU shares of VM's contained within resource pools. Can only handle resource pool depth of 1. 

function Log ($text) {
    [int]$duration = (New-TimeSpan $start (Get-Date)).TotalSeconds
    Write-Host "$duration secs | $text"
}
$start = Get-Date

Log "Initialising output tables..."

$tSummary = New-Object system.Data.DataTable "Summary Results"
$tSummary.columns.add((New-Object system.Data.DataColumn Name,([string])))
$tSummary.columns.add((New-Object system.Data.DataColumn CPU_Shares,([int])))
$tSummary.columns.add((New-Object system.Data.DataColumn VMs,([int])))
$tSummary.columns.add((New-Object system.Data.DataColumn Weighted,([single])))

$tDetail = New-Object system.Data.DataTable "Detailed Results"
$tDetail.columns.add((New-Object system.Data.DataColumn Res_Pool,([string])))
$tDetail.columns.add((New-Object system.Data.DataColumn VM,([string])))
$tDetail.columns.add((New-Object system.Data.DataColumn Res_CPU_Shares,([int])))
$tDetail.columns.add((New-Object system.Data.DataColumn VM_CPU_Shares,([int])))
$tDetail.columns.add((New-Object system.Data.DataColumn Eff_VM_Shares,([single])))

Log "Getting resource pools..."
$ResPools = Get-ResourcePool

ForEach ($ResPool in $ResPools) {
    $VMs = Get-VM -Location $ResPool -NoRecursion | Where {$_.PowerState -eq "PoweredOn"}
    If (!$VMs) {         #Skip any resource pools with no VM's
        Log ("Skipping " + $ResPool.Name + " (no VMs)")
        Continue
    }
    $rSummary = $tSummary.NewRow()
    
    Log ("Analysing " + $ResPool.Name + "...")
    $rSummary.Name = $ResPool.Name
    $rSummary.CPU_Shares = $ResPool.NumCpuShares
    
    If (!$VMs.Count) {   # If only 1 VM in ResPool we don't get a normal array returned (so !VMs.Count is NULL)
        $rSummary.VMs = 1
    } else {
        $rSummary.VMs = $VMs.Count
    }
    $rSummary.Weighted = $rSummary.CPU_Shares / $rSummary.VMs
    $tSummary.Rows.Add($rSummary)
    
    # Get each VM's shares
    $totShares = 0
    $VMshares = @{}
    ForEach ($vm in $VMs) {
        $VMShares[$vm.Name] = ($vm | Get-VMResourceConfiguration).NumCpuShares
        $totShares += $VMShares[$vm.Name]
    }
    
    # Work out each VM's proportional CPU share
    ForEach ($vm in $VMs) {
        $rDetail = $tDetail.NewRow()
        
        $rDetail.Res_Pool = $ResPool.Name
        $rDetail.VM = $vm.Name
        $rDetail.Res_CPU_Shares = $ResPool.NumCpuShares
        $rDetail.VM_CPU_Shares = $VMShares[$vm.Name]
        If ($ResPool.Name -eq "Resources") {
            $rDetail.Eff_VM_Shares = $rDetail.VM_CPU_Shares
        } else {
            $rDetail.Eff_VM_Shares = $ResPool.NumCpuShares * ($rDetail.VM_CPU_Shares / $totShares)
        }
        $tDetail.Rows.Add($rDetail)
    } 
}

Log "Done! Writing results out..."
$tSummary | Export-Csv -path ESX-ResPoolInfo-Summary.csv
$tDetail | Export-Csv -path ESX-ResPoolInfo-Detail.csv
$tSummary

ESX NIC Info

Provides a list of all vmnic speeds for ESX's connected to vCentre 

$ESXs = Get-VMHost

Foreach ($esx in $ESXs) {
    Write-Host $esx.Name $esx.State
    $pNICs = (Get-VMHost -Name "MyESX*" | Get-View).Config.Network.Pnic

    $result = @{}
    Foreach ($pNIC in $pNICs) {
        $result[$pNIC.Device] = $pNIC.LinkSpeed.SpeedMB
    }
    $result = $result.GetEnumerator() | Sort-Object -Property Name
    $result
    Write-Host
}

ESX Discovered Networks Hint

This function provides the discovered network hints for the network interface its passed. Bear in mind that its just a hint, for an ESX to be aware of a particular vLAN it needs to see traffic. If there's no traffic it will show nothing.

Adapted from the following article on the VMware site blog http://blogs.vmware.com/vipowershell/2010/02/how-to-find-out-what-vlans-your-esx-hosts-can-really-see.html 

function Get-ObservedIPRange {
	param(
		[Parameter(Mandatory=$true,ValueFromPipeline=$true,HelpMessage="Physical NIC from Get-VMHostNetworkAdapter")]
		[VMware.VimAutomation.Client20.Host.NIC.PhysicalNicImpl]
		$Nic
	)

	process {
		$hostView = Get-VMHost -Id $Nic.VMHostId | Get-View -Property ConfigManager
		$ns = Get-View $hostView.ConfigManager.NetworkSystem
		$hints = $ns.QueryNetworkHint($Nic.Name)

		foreach ($hint in $hints) {
			foreach ($subnet in $hint.subnet) {
				$observed = New-Object -TypeName PSObject
				$observed | Add-Member -MemberType NoteProperty -Name Device -Value $Nic.Name
				$observed | Add-Member -MemberType NoteProperty -Name VlanId -Value $subnet.VlanId
				$observed | Add-Member -MemberType NoteProperty -Name IPSubnet -Value $subnet.IPSubnet
				$observed | Add-Member -MemberType NoteProperty -Name BitRatePerSec -Value $nic.BitRatePerSec
				Write-Output $observed
			}
		}
	}
}

# Example use:


$result = Get-VMHost MyESX* | Get-VMHostNetworkAdapter | Where {$_.Name -Match ".*vmnic*"} | Get-ObservedIPRange | Sort-Object -Property Device, VlanId
$result | Export-Csv -path ESX-vLANs-Observed.csv

ESX CDP Info

Adapted from posted by LucD on VMware forum http://communities.vmware.com/message/977487 

Get-VMHost | Sort -Property Name | %{Get-View $_.ID} | %{$esxname = $_.Name; Get-View $_.ConfigManager.NetworkSystem} | %{
  foreach($physnic in $_.NetworkInfo.Pnic){
    $pnicInfo = $_.QueryNetworkHint($physnic.Device)
    foreach($hint in $pnicInfo){
      Write-Host $esxname $physnic.Device $hint.connectedSwitchPort.DevId $hint.connectedSwitchPort.PortId
    }
  }
}

Ping All VM's On ESX

Useful sanity check prior to and after network level changes 

$esxToFind = "MyESX*"

$ESX = get-vmhost $esxToFind
if (!$ESX) {
    Write-Host "ERROR: No ESX found with name matching expression $esxToFind" -Background Red -ForegroundColor DarkRed
    Exit
}

# Get list of VM's on $ESX
$VMs = $ESX | get-vm | Where {$_.PowerState -eq "PoweredOn"} | Sort -property Name 
$objPing = New-Object system.Net.NetworkInformation.Ping

Foreach ($VM in $VMs) {
    Write-Host $VM.Name.PadRight(20) -nonewline
    
    # Get guest's primary IP address
    $ip = (Get-VMGuest -VM $vm).IPAddress[0]
    if (!$ip) {
        Write-Host "NULL - Skipping test" -Background DarkYellow -ForegroundColor Yellow
        Continue
    }
    Write-Host $ip.PadRight(17) -nonewline
    if ($ip -eq '0.0.0.0') {
        Write-Host "Skipping" -Background DarkYellow -ForegroundColor Yellow
        Continue
    }
        
    [string]$res = $objPing.Send($ip).Status
    if ($res.CompareTo("Success")) {                    # Returns 1 if $res doesn't match "Success" !!
        Write-Host $res -BackgroundColor DarkRed -ForegroundColor Red
    } else {
        Write-Host $res -BackgroundColor DarkGreen -ForegroundColor Green
    }
}
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