Sample script showing how to update VM instances in VMSS

InvokeVMSSRunCommand.ps1

$PowershellScript =

@{

commandId = "RunPowerShellScript"

script =

@(

"Write-Output $env:computername",
"Get-Location"

)

}


$resourceGroupName = "iotci"
$vmssname = "rajvmss"

$vmss = get-azurermvmss -ResourceGroupName $resourceGroupName -VMScaleSetName $vmssname

$vmcount = $vmss.sku.capacity

Write-Output "VMSS VM Count is $vmcount"

For ($i=0; $i -lt $vmcount; $i++) {
    $vmid = $vmss.id + "/virtualMachines/$i"
    Write-Output "VM ID is $vmid"
    Write-Output "begin: invoking script against vmss instance $i"
    Invoke-AzureRmResourceAction -ResourceId $vmid -Action runCommand -Parameters $PowershellScript -ApiVersion 2017-12-01  -force
    Write-Output "finish: invoking script against vmss instance $i"
}