Azure Virtual Machine Scale Sets: Check Availability constructs

vmss-availability.ps1

Connect-AzAccount

$mysub = "my-subscription-name"
$rg = "my-resourcegroup-name"
$vmssname = "my-vmss-name"
Set-AzContext -Subscription $mysub

$vmssmodel = Get-AzVmss -ResourceGroupName $rg -VMScaleSetName $vmssname
Write-Output($vmssmodel.Id)
Write-Output("FD Count: " + $vmssmodel.PlatformFaultDomainCount)
Write-Output("Single Placement Group: " + $vmssmodel.SinglePlacementGroup)

$myvmss = Get-AzVmssVM -ResourceGroupName $rg -VMScaleSetName $vmssname -InstanceView
Write-Output ("Total # Instances: " + $myvmss.Count)
$zones = 1..3
foreach ($zone in $zones) {
    $zonecount =  $myvmss | Where-Object {$_.Zones[0] -eq [string]$zone} | Measure-Object
    Write-Output  ("VMs in zone ${zone}: " + $zonecount.Count)
}

$PlatformFaultDomains = 0..4
foreach ($pfd in $PlatformFaultDomains) {
    $pfdcount =  $myvmss | Where-Object {$_.InstanceView.PlatformFaultDomain -eq $pfd} | Measure-Object
    Write-Output  ("VMs in Fault Domain ${pfd}: " + $pfdcount.Count)
}

$PlatformUpdateDomains = 0..4
foreach ($ufd in $PlatformUpdateDomains) {

    $ufdcount =  $myvmss | Where-Object {$_.InstanceView.PlatformUpdateDomain -eq $ufd} | Measure-Object
    Write-Output  ("VMs in Update Domain ${ufd}: " + $ufdcount.Count)
}