Creat-UnixVM.ps1

<#
Create a Unix VM.

1- We grab the current VM's that are named "ntprsrv-app##"
2- We get the number+1, that's the new name.
3- We create the folders under D:\VM\VMname\Virtual Hard Disks
4- We copy the "D:\Software\CentOS 7 - Ready to Copy - 2018-01-20.vhdx" to it.
5- We create a new VM using the disk, there's a prompt for the number of CPU and RAM.
6- We disable SecureBoot
7- We boot that bad boy up.
8- We set a timer for 30secs then we pop up that it's ready.

#>

clear

$DynamicMemory = Read-Host "Dynamic Memory ? (y/n) " 
    Switch ($DynamicMemory) 
     { 
       Y {Write-host -foreground green "Yes, let's use a modern OS!`n"; $dynMem=$true} 
       N {Write-Host -foreground yellow "No, I'm gonna be using some weirdly done apps or a database.`n"; $dynMem=$false} 
       Default {Write-Host -foreground yellow "Default is that we're using it, because we believe in the power of Myth !`n"; $dynMem=$true} 
     }


     if($dynMem) {
        $maxMem = Read-Host "Maximum memory ? (GB) "
        $minMem = Read-Host "Minimum memory ? (GB) "
        $startMem = Read-Host "Startup memory ? (GB) "
     } else {
        $startMem = Read-Host "Memory ? (GB) "
     }

     $cores = Read-Host "vCPU's ? (GB) "

     $many = Read-Host "How many VM do you want ? (1-...) "

     Write-Host "`nOk, enough questions, time for action!`n"

Write-Host "Starting timer.`n"
$stopwatch =  [system.diagnostics.stopwatch]::StartNew()
For ($i=0; $i -le $many; $i++) {
    
Write-host "Creating VM $i of $many."


$vmname = "NTPRSRV-APP" + (([int](get-vm -name "ntprsrv-app*" | select @{ Label = 'Number' ;Expression = { $_.VMName.Substring(11,2) } } | sort number | select -Last 1).number) + 1)

write-host "Starting script...`n`nThis will create a VM with name $vmname.`nLet's go!`n`n"
    
    
    
    if(-not (Test-Path "D:\VM\$vmname\Virtual Hard Disks\$vmname.vhdx")) {

    New-Item -Force -ItemType Directory -Path "D:\VM\$vmname\Virtual Hard Disks" | out-null

    Write-host "Copying the VHD, it's about 10gb so should take a couple mins." -NoNewline

    Import-Module BitsTransfer
    Start-BitsTransfer -Source 'D:\Software\CentOS 7 - Ready to Copy - 2018-01-20.vhdx' -Destination "D:\VM\$vmname\Virtual Hard Disks\$vmname.vhdx" -Description "Copying VHDX" -DisplayName "Copy"

    Write-Host -ForegroundColor Green " Done."
    }

    Write-host "Creating new virtual machine." -NoNewline

    New-VM -Name $vmname -MemoryStartupBytes ([int]$startMem*1GB) -BootDevice VHD -VHDPath "D:\VM\$vmname\Virtual Hard Disks\$vmname.vhdx" -Path "D:\VM\$vmname\" -Generation 2 -SwitchName (Get-VMSwitch -SwitchType External).name | out-null

    Write-Host -ForegroundColor Green " Done."

    Write-host "Customizing virtual machine." -NoNewline
    
    if($dynMem) { Set-VMMemory -VMName $vmname -MaximumBytes ([int]$maxMem*1GB) -DynamicMemoryEnabled $true -MinimumBytes ([int]$minMem*1GB) }
    Set-VM -VMname $vmname -ProcessorCount $cores -AutomaticStopAction ShutDown -AutomaticStartAction StartIfRunning -AutomaticStartDelay (Get-Random -Minimum 100 -Maximum 800)
    Set-VMFirmware -VMName $vmname -EnableSecureBoot Off -FirstBootDevice (get-VMHardDiskDrive -VMName $vmname)
    Get-VM -VMname $vmname | Enable-VMIntegrationService -Name *
    
    Write-Host -ForegroundColor Green " Done."

    Write-host "Customizing networking." -NoNewline
    
    Set-VMNetworkAdapterVlan -VlanId 1 -VMName $vmname -Access

    Write-Host -ForegroundColor Green " Done."
    
    Start-VM $vmname

    }
   
   $stopwatch.Stop()
   Write-host "Total time : $([math]::Round($stopwatch.Elapsed.TotalSeconds,0)) seconds for $many Virtual machines."

Not doing any tests because we assume that everything here just works