#First some definitions...
# the VmAbbr is the abbreviation that I'm using for the beginning of the name for each VM - I'm using "mesos", "k8s", and "docker" for Apache Mesos, Kubernetes, and Docker Swarm respectively.
$VmAbbr = "mesos"
# The VM Names are basically the names that I want for the VMs.  I could do this with a For...Loop, but I was lazy and just wrote it out.
$VMNames = "$( $VmAbbr )-master", "$( $VmAbbr )-node01", "$( $VmAbbr )-node02", "$( $VmAbbr )-node03", "$( $VmAbbr )-node04", "$( $VmAbbr )-node05"

# This is the path to the DVD that I want to use for booting the CentOS installer.  You can choose a different one here if you like.  It's easier to make this a local path instead of a UNC Share.
$BootDvd = "D:\Hyper-V\ISOs\Operating Systems\Linux\CentOS\CentOS-7-x86_64-Minimal-1804.iso"

# Build a VM for each of my names
ForEach ( $VMName in $VMNames )
{
    # Does a VM with said name already exist?
    if ( Get-VM -Name $VMName -ErrorAction SilentlyContinue)
    {
        #  It does?  Then remove it - no questions asked.
        Remove-VM -Name $VMName -Confirm:$false -Force
    }

    # This is the path for the VHD - for me, it's in the default location as all the other ones, so we'll keep with that.  I join together the Default Path and the name of the new VHD.
    $VHDPath = ( Join-Path -Path ( Get-VMHost | Select-Object -ExpandProperty VirtualHardDiskPath ) -ChildPath "$( $VMName ).vhdx" )

    # Does a file already exist with that name in that location?
    if ( Test-Path -Path $VHDPath )
    {
        # It does?  Sorry - remove it.
        Remove-Item -Path $VHDPath -Force -Confirm:$False
    }
    # Let's create a new VHD using 127GB for the size (I've got plenty of space) and use 1MB block sizes as recommended according to Linux on Hyper-V best practices.  We'll also use dynamic disks
    $VHD = New-VHD -Path $VHDPath -BlockSize 1MB -SizeBytes 127GB -Dynamic

    # Let's build the VM with 1GB of memory to start, using the VHD we just built, the default switch (in my case 'vSwitch'), and make it EFI bootable (Generation 2)
    $VM = New-VM -Name $VMName -MemoryStartupBytes 1GB -VHDPath $VHDPath -SwitchName vSwitch -Generation 2
    # Take that VM and turn off secure boot (required by most *NIX distributions
    $VM | Set-VMFirmware -EnableSecureBoot Off
    # Add a DVD Drive to the VM which points to the Boot Device from above
    $VM | Add-VMDvdDrive -Path $BootDvd
    # Set the boot device to be the DVD we just defined
    $VM | Set-VMFirmware -FirstBootDevice ( $VM | Get-VMDvdDrive )
    # Disable automatic checkpoints - this is my BIGGEST beef with the newer desktop Hyper-V setups and I always forget to remove it, so now I won't
    $VM | Set-VM -AutomaticCheckpointsEnabled:$false
    # Give the VM 2 processors and use Production (not standard) checkpoints
    $VM | Set-VM -ProcessorCount 2 -CheckpointType Production
} # Loop back and go to the next.