Here's a useful script.
ESXi host NTP configuration information
Connect-VIServer -Server avcenter -User myadmin@corp.com
Connect-VIServer -Server bvcenter -User myadmin@corp.com
#
Get-VMHost | Select Name, @{N="NTPServer";E={$_ |Get-VMHostNtpServer}}, @{N="Service is Running?";E={(Get-VmHostService -VMHost $_ | Where-Object {$_.key -eq "ntpd"}).Running}}, @{N="Firewall Rule?";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).Enabled}}, @{N="Firewall Incoming Ports";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).IncomingPorts}}, @{N="Firewall Outgoing Ports";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).OutgoingPorts}}, @{N="Firewall Protocols";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).Protocols}} | Format-Table
Get-VMHost | Select Name, @{N="NTPServer";E={$_ |Get-VMHostNtpServer}}, @{N="Service is Running?";E={(Get-VmHostService -VMHost $_ | Where-Object {$_.key -eq "ntpd"}).Running}}, @{N="Firewall Rule?";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).Enabled}}, @{N="Firewall Incoming Ports";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).IncomingPorts}}, @{N="Firewall Outgoing Ports";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).OutgoingPorts}}, @{N="Firewall Protocols";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).Protocols}} | Out-GridView
#
$FilePath = "C:\temp\NTPESXiHosts.csv"
$FileContent = Import-CSV $FilePath
Foreach ($CsvLine in $FileContent)
{
$esx = $CsvLine.hostname
Write-Host Updating NTP on $esx
$allNtpServers = Get-VMHostNtpServer -VMHost $esx
If ($allNtpServers -ne $Null)
{
Remove-VMHostNtpServer -VMHost $esx -NtpServer $allNtpServers -Confirm:$false
Write-Host "All NTP Servers from $esx have been removed." `n
}
# Add NTP servers separately - you can have multiple Add-VmHostNtpServer cmdlet lines
Add-VmHostNtpServer -VMHost $esx -NtpServer time0.corp.com
Add-VmHostNtpServer -VMHost $esx -NtpServer time1.corp.com
# Set the firewall regulation to allow traffic for NTP lookup
Get-VMHostFirewallException -VMHost $esx | Where {$_.Name -eq "NTP client"} | Set-VMHostFirewallException -Enabled $true
# Start NTP daemon and make it start automatically when needed
Get-VmHostService -VMHost $esx | Where-Object {$_.Key -eq "ntpd"} | Set-VMHostService -Policy "On"
Get-VmHostService -VMHost $esx | Where-Object {$_.Key -eq "ntpd"} | Start-VMHostService
}
#
Get-VMHost | Select Name, @{N="NTPServer";E={$_ |Get-VMHostNtpServer}}, @{N="Service is Running?";E={(Get-VmHostService -VMHost $_ | Where-Object {$_.key -eq "ntpd"}).Running}}, @{N="Firewall Rule?";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).Enabled}}, @{N="Firewall Incoming Ports";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).IncomingPorts}}, @{N="Firewall Outgoing Ports";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).OutgoingPorts}}, @{N="Firewall Protocols";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).Protocols}} | Format-Table
Get-VMHost | Select Name, @{N="NTPServer";E={$_ |Get-VMHostNtpServer}}, @{N="Service is Running?";E={(Get-VmHostService -VMHost $_ | Where-Object {$_.key -eq "ntpd"}).Running}}, @{N="Firewall Rule?";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).Enabled}}, @{N="Firewall Incoming Ports";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).IncomingPorts}}, @{N="Firewall Outgoing Ports";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).OutgoingPorts}}, @{N="Firewall Protocols";E={(Get-VMHostFirewallException -VMHost $_ | where {$_.Name -eq "NTP client"}).Protocols}} | Out-GridView
