rename hostname using powershell script

Question

I am cloning an instance using golden image in AWS and I am trying to rename the instance using the IP address. The thing is I can clone and the variable $ipaddress contains the corresponding IP address, but I'm unable to get the hostname.

foreach ($key in $SystemTypes.Keys) {
  [String]$value = $SystemTypes[$key]

    #$value = $($SystemTypes[$key])
    $ipaddarray = $value.split('.')

    $ipaddress = $ipaddarray[0]+'.'+$ipaddarray[1]+'.'+$ipaddarray[2]+'.'+$ipaddarray[3]    

    Write-Host "the type is $key"
    Write-Host "the ip is  $ipaddress"
    Write-Host $value
    $object = Get-WmiObject -Class win32_operatingsystem -ComputerName $ipaddress -Credential $MylocalCreds    
     $hostname = $object.__server

Answer 1

Why are you doing this...

$ipaddarray = $value.split('.')

    $ipaddress = $ipaddarray[0]+'.'+$ipaddarray[1]+'.'+$ipaddarray[2]+'.'+$ipaddarray[3] 

.. vs just using the built-in NIC/network cmdlets to get the IPA as a simple string.

(Get-NetIPAddress).IPv4Address

Getting a system hostname is a default system variable on every Windows host. Just use:

$env:COMPUTERNAME 

Or

hostname

You should be able to do just what is described in the articles below.

Rename-Computer -NewName 'SomeHostname' -Restart

Dynamically rename an AWS Windows host deployed via a syspreped AMI

1. Deploy a Windows Server 2016 AMI

2. Connect to the Windows instance and customize it as required

3. Create a startup PowerShell script to set the hostname that will be invoked on boot before the unattended installation begins

4. Run InitializeInstance.ps1 -Schedule to register a scheduled task that initializes the instance on the next boot

5. Modify SysprepInstance.ps1 to replace the cmdline registry key after sysprep is complete and prior to shutdown

6. Run SysprepInstance.ps1 to sysprep the machine.

#Set my hostname based on my internal IP address
$instanceName = (((Invoke-WebRequest -UseBasicParsing -Uri http://169.254.169.254/latest/meta-data/hostname).Content).split(".")[0]).replace("ip-172-31","TCG")

#Change the hostname in the unattend.xml file
$filePath = "C:\Windows\Panther\Unattend.xml"
$AnswerFile = [xml](Get-Content -Path $filePath)
$ns = New-Object System.Xml.XmlNamespaceManager($answerFile.NameTable)
$ns.AddNamespace("ns", $AnswerFile.DocumentElement.NamespaceURI)
$ComputerName = $AnswerFile.SelectSingleNode('/ns:unattend/ns:settings[@pass="specialize"]/ns:component[@name="Microsoft-Windows-Shell-Setup"]/ns:ComputerName', $ns)
$ComputerName.InnerText = $InstanceName
$AnswerFile.Save($filePath)

#Start the OOBE
Start-Process C:\windows\system32\oobe\windeploy.exe -Wait

How to rename an AWS EC2 instance during provisioning using PowerShell

Rename-Computer -NewName 'SomeHostname' -Restart

How to change & verify hostname in windows server 2012 (AWS EC2)

Method 1. Open cmd and type: SCONFIG and you will get selection menu where #2 says Computer Name:

Method 2. From cmd type:

netdom renamecomputer %computername% /newname:<NewName> /reboot:0

Method 3. From the PowerShell console:

netdom renamecomputer $env:computername /newname:<NewName> /reboot:0

To verify the name form cmd type:

nbtstat -A xxx.xxx.xxx.xxx (where x is the ip address)

Another way to verify the name form cmd just type "hostname" without any parameters:

  hostname