Automatically upgrade vCPU's

I am lazy. Well, not lazy, I just don't like working at ungodly hours. Here's the story: I got this request to upgrade 2 customer VM's from 3 vCPU's to 4 vcpu's. No biggy, I thought. But he wanted it done after 1 AM.. Wait, that's not during office hours!

OK, I could fix that with my trusty Powershell toolkit, and a scheduled task. But then I talked to the customer who went like: "Sure that's fine with me to script it, but make sure the sessions are drained from the webserver".. Hmm, F5 loadbalancers. I've not worked too much with those before, really. I get the general ideas within loadbalancing, but let's try and script against it.

So I had a number of things I wanted to happen:

• Log in to the F5 loadbalancer, preferably not with a script filled with credentials hardcoded into it. 
• Wait an X amount of time for connections to drop from the specific pool
• Shut down the machine, and wait for it to be properly turned off.
• Set the number of CPU's and memory. This had an extra challenge, namely that the person who built the VM put in 1 vCPU with 3 cores, instead of 3 vCPU's.
• Send an email with the results, so I can see what happened from my phone.

I'll spend a few posts on those different things.

Firstly the vCPU upgrade, which is the basis of this entire story:

Normally, you can turn off a VM, upgrade vCPU's, then start a VM again, through this simple set of commands:

$VM=Get-VM -Name 'WEB01'

Stop-VMGuest –VM $VM –Confirm:$False

do {

        $status = (get-VM $VM).PowerState

    }until($status -eq "PoweredOff")

$VM | Set-VM -NumpCPU 4 –Confirm:$False | Start-VM

However, since someone used 1 vCPU with multiple cores instead of multiple vCPU sockets, things work a little differently. If you would try this command, the VM would be shut down, but no upgrade would happen, and start back up with the same amount as before.

Fortunately there's another trick for that:

$VMSpec = New-Object -Type VMware.Vim.VirtualMachineConfigSpec -Property @{"NumCoresPerSocket" = 4;"numCPUs" = 4}

$VM.ExtensionData.ReconfigVM_Task($VMSpec)

(That first line shouldn't be cut off like that, should be 1 line, but alas: blog template gets in the way)

Now the VM gets upgraded to 4 vCPU's, although you would think it'd be 4x4 cpu's looking at the syntax.

So now the final complete code would be:

Add-PSsnapin VMware.VimAutomation.Core

Connect-VIServer myVcenter -ErrorAction Stop

$VM=Get-VM -Name 'WEB01'

Stop-VMGuest –VM $VM –Confirm:$False

do {

        $status = (get-VM $VM).PowerState

    }until($status -eq "PoweredOff")

$VMSpec = New-Object -Type VMware.Vim.VirtualMachineConfigSpec -Property @{"NumCoresPerSocket" = 4;"numCPUs" = 4}

Start-VM $VM

Yeay, success! Now on to the next bit...