Add VMSS extensions with settings and protected settings- Powershell

 The below script guides you to add/remove a vmss extension in Azure. The example is for adding Microsoft Monitoring Agent to Azure vmss which will have workspace Id to collect custom logs from VM's

Get VMSS to a variable

$vmssname= Get-AzVmss -ResourceGroupName npqatx -VMScaleSetName <vmssname>

$workspaceId="GUID of log analytics workspace"

 $workspaceKey="workspace key"

$settings=@{"workspaceId" = $workspaceId}

$protSettings=@{"workspaceKey" = $workspaceKey}

#Adding new extension

Add-AzVmssExtension -VirtualMachineScaleSet $vmssname -Name "MMAExtension" -Publisher "Microsoft.EnterpriseCloud.Monitoring" -Type "MicrosoftMonitoringAgent" -TypeHandlerVersion "1.0" -AutoUpgradeMinorVersion $true -Setting $settings -ProtectedSetting $protSettings

Update-AzVmss -ResourceGroupName "RGName" -VMScaleSetName $vmssname.Name -VirtualMachineScaleSet $vmssname

#Remove existing vmss extension

Remove-AzVmssExtension -VirtualMachineScaleSet $webvmss -Name "MMAExtension"

Update-AzVmss -ResourceGroupName "RGName" -VMScaleSetName $vmssname.Name -VirtualMachineScaleSet $vmssname

#make sure to upgrade instances in vmss to the latest model after every change to vmss.