# thanks https://www.kmruddy.com/2013/powercli-reset-ntp-settings-on-vmhosts-per-cluster/
# tweaked by https://vmscribble.com
# What is the vCenter and ESXI FQDN?
$vCenter = Read-Host "Enter the vCenter FQDN"
$InputCluster = Read-Host "Enter the Cluster Name"
# What are the 2 new NTP servers?
$InputNTP1 = Read-Host "Enter the 1st New NTP Server"
$InputNTP2 = Read-Host "Enter the 2nd New NTP Server"
#NTP servers to be changed to
$ntp1 = $InputNTP1
$ntp2 = $InputNTP2
#Check with end user before connecting to the VC
Write-Host ""
Read-Host "
--> Hit ENTER to proceed to:
1. Remove the current NTP servers from all ESXi hosts in Cluster $InputCluster
2. Add NTP servers $InputNTP1 and $InputNTP2
"
Write-Host ""
# Connect to your vCenter
Connect-VIServer $vCenter | out-null
#Select Cluster to change NTP Settings
$Cluster = Get-Cluster $InputCluster
#Grabbing VMHosts for desired Cluster
$allVMhost = $Cluster | Get-VMHost | sort Name
#Reseting NTP servers one by one
foreach ($vmhost in $allVMhost){
#Remove existing NTP servers
Write-Host "--> $vmhost" -foregroundcolor Green
Write-Host "Step 1 - Removing all NTP Servers from $vmhost" -foregroundcolor Gray
$allNTPList = Get-VMHostNtpServer -VMHost $vmhost
Remove-VMHostNtpServer -VMHost $vmhost -NtpServer $allNTPList -Confirm:$false | out-null
Write-Host "Step 1 - Confirmed. All NTP Servers from $vmhost have been removed" -foregroundcolor Gray
#Setting NTP servers
Write-Host "Step 2 - Adding NTP servers to $vmhost" -foregroundcolor Gray
Add-VmHostNtpServer -NtpServer $ntp1,$ntp2 -VMHost $vmhost -Confirm:$false | out-null
Write-Host "Step 2 - The following NTP servers have been added to $vmhost : $ntp1, $ntp2" -foregroundcolor Gray
#Checking NTP Service on the ESXi host
$ntp = Get-VMHostService -vmhost $vmhost| ? {$_.Key -eq 'ntpd'}
Set-VMHostService $ntp -Policy on | out-null
if ($ntp.Running ){
Restart-VMHostService $ntp -confirm:$false
Write-Host "Step 3 - $ntp Service on $vmhost was On and was restarted" -foregroundcolor Gray
}
Else{
Start-VMHostService $ntp -confirm:$false
Write-Host "Step 3 - $ntp Service on $vmhost was Off and has been started" -foregroundcolor Gray
}
Write-Host ""
Write-Host ""
}
# list current
Write-Host ""
Write-Host "AFTER the change - Current NTP in Cluster $InputCluster" -foregroundcolor Green
$Cluster | Get-VMHost | sort Name | Select Name, @{N="NTPServer";E={$_ |Get-VMHostNtpServer}}
# Disconnect from the vCenter
Disconnect-VIServer $vCenter -Confirm:$false
