Powershell script which uploads and executes the customize bash script that freezes and prepairs the ESXi virtual Appliance for instant cloning

Freeze-VirtualESXi.ps1

# Witten by Nicholas Mangraviti #VirtuallyWired
# Credit to William Lam for the customize.sg script - https://williamlam.com/2018/05/leveraging-instant-clone-in-vsphere-6-7-for-extremely-fast-nested-esxi-provisioning.html
# Requires Posh-SSH Module, this script will attempt to install it if not already installed.
# Note, this script is not the full instant cloning script this Powershell script which uploads and executes the customize bash script that freezes and prepairs the ESXi virtual Appliance for instant cloning.
# Tested with vSphere 6.7, 7.0 & 8.0

# Update Nested ESXi Template IP Below
$SourceESXiIP = "172.18.9.19"

# Get ESXi Host Credentials
$HostCred = Get-Credential
$CustomizeScriptUrl = 'https://raw.githubusercontent.com/lamw/instantclone-community-customization-scripts/master/esxi65-67/customize.sh'

# --- This will install the Posh-SSH Module if not found.
Write-Host "Checking for Required Module Posh-SSH" -ForegroundColor Green
    
if (Get-Module -ListAvailable -Name Posh-SSH) {
    Write-Host "Posh-SSH Module Already Installed" -ForegroundColor Green
}
else {
    Write-Host "Posh-SSH Module Not Found, Attempting to Install" -ForegroundColor Yellow
    Install-Module -Name Posh-SSH -Scope CurrentUser -Force -Confirm:$false
}

# --- Importing the Posh-SSH Module.
if (Get-Module -ListAvailable -Name Posh-SSH) {
    Write-Host "Importing Posh-SSH Module" -ForegroundColor Green
    Import-Module -Name Posh-SSH -Force
}
Else {
    Write-host "Something Went Wrong, Stopping Script" -ForegroundColor Red
    Break
}

# Download customize.sh Script from repo
Invoke-WebRequest -Uri $CustomizeScriptUrl -OutFile '.\customize.sh'

# Open SSH Session to Nested ESXi Template     
$SSH = New-SSHSession -ComputerName $SourceESXiIP -Credential $HostCred -AcceptKey -Force -WarningAction SilentlyContinue
Write-Host "Started New SSH Session: $($SSH.Connected)" -ForegroundColor Green

# Copy the customize.sh script to the Host    
Set-SCPItem -ComputerName $SourceESXiIP -Credential $HostCred -Path '.\customize.sh' -Destination '/tmp/' -AcceptKey -Force -WarningAction SilentlyContinue
$Checkfile = Invoke-SSHCommand -SSHSession $SSH -Command 'ls /tmp/'

# Update permissions on cutomize.sh to be executable
If ($Checkfile.Output -contains "customize.sh") {
    Write-Host "Customize.sh Script uploaded Successfully" -ForegroundColor Green    
    Invoke-SSHCommand -SSHSession $SSH -Command 'chmod +x /tmp/customize.sh' | Out-Null
    Invoke-SSHCommand -SSHSession $SSH -Command '/tmp/customize.sh' -TimeOut 1 -ErrorAction SilentlyContinue | Out-Null
}

Start-Sleep -Seconds 5
Write-Host "ESXi Virtual Appliance is Frozen and ready for Instant Cloning" -ForegroundColor Cyan

# Close all SSH Sessions
$SessionIDs = (Get-SSHSession).SessionId
If (Get-SSHSession) {
    Foreach ($SessionID in $SessionIDs) {
        Remove-SSHSession -SessionId $SessionID | Out-Null
        Write-Host "Closing SSH Session ID: $($SessionID)" -ForegroundColor Gray
    }
    If (!(Get-SSHSession)) {
        Write-Host "Succesfully Closed All SSH Sessions" -ForegroundColor Gray 
    }
}