intial description

Setting up DNS and NTP servers on bulk of ESXi hosts

A simple script which will set up your DNS servers and the NTP servers which are really imprtant things to run your infra smooth and streamlined.

It also restarts the NTP and enable them if it was disabled.

Very easy to run no special requirement except powercli module and powershell to be installed where your are running this script.

It runs on cluster by cluster but you can run it on datacenter wise or on whole list of ESXi hosts in Vcenter. This script set up 3 DNS and 3 NTP servers in sequence you can customize this for 1 dns 1 NTP or so on.

Find the script below

body

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import-module vmware.vimautomation.core

#This script removes your existing DNS and then start setting the new DNS which you put here
$ntpone = "1.1.1.1"
$ntptwo = "2.2.2.2"
$ntpthree = "3.3.3.3"
connect-viserver home.vmwarediary.com -User JitendraKSingh@vmwarediary.com -Password abc@123456
$esxhost = get-cluster -name Home-IT | get-vmhost
$esxcli = Get-EsxCli -VMHost $esxhost -V2

$esxhost | %{

$esxcli = Get-EsxCli -VMHost $_ -V2
$dnsServers = '1.1.1.1','2.2.2.2','3.3.3.3'

$esxcli.network.ip.dns.server.list.Invoke() | select -ExpandProperty DNSServers | %{

$sOldDns = @{

server = $_

}

$esxcli.network.ip.dns.server.remove.Invoke($sOldDns)

}
}

Start-Sleep -Seconds 10
Write-Host "waiting for 10 seconds to apply new DNS settings"
$esxhost | %{
$esxcli = Get-EsxCli -VMHost $_ -V2
$dnsServers = '1.1.1.1','2.2.2.2','3.3.3.3'
$dnsServers | %{

$sDns = @{

server = $_

}

$esxcli.network.ip.dns.server.add.Invoke($sDns)

}

}
Write-Host "Configuring NTP Servers on $esxhost" -ForegroundColor Green
Add-VMHostNTPServer -NtpServer $ntpone , $ntptwo , $ntpthree -VMHost $esxhost -Confirm:$false

Write-Host "Configuring NTP Client Policy on $esxhost" -ForegroundColor Green
Get-VMHostService -VMHost $esxhost | where{$_.Key -eq "ntpd"} | Set-VMHostService -policy "on" -Confirm:$false

Write-Host "Restarting NTP Client on $esxhost" -ForegroundColor Green
Get-VMHostService -VMHost $esxhost | where{$_.Key -eq "ntpd"} | Restart-VMHostService -Confirm:$false

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