How to set Always On for Azure Function app via PowerShell

If you run Azure functions on dedicated App service plan (vs Consumption plan) of Basic pricing tier and above you may speed up warmup time of Azure functions by enabling Always On setting (Azure Function app > Configuration > General settings):

If you need to automate this process here is the PowerShell script which can be used in order to set Always On for Azure Function app:

$resourceGroupName = ...
$functionAppName = ...
$webAppPropertiesObject = @{"siteConfig" = @{"AlwaysOn" = $true}}
$webAppResource = Get-AzureRmResource -ResourceType "microsoft.web/sites" -ResourceGroupName $resourceGroupName -ResourceName $functionAppName
$webAppResource | Set-AzureRmResource -PropertyObject $webAppPropertiesObject -Force

After that you Function app will have Always On setting enabled.