Enable Custom Auto-Heal settings for an Azure App via PowerShell

Auto-healing is a powerful feature of Azure App Service and is used a lot by Azure App Service customers. Once a requirement came to me asking if it was possible to configure Auto-Healing settings for an app via PowerShell. Since all the AutoHeal settings are stored in ARM (Azure Resource Manager), you can easily write a PowerShell script that configures autohealing for your app and use the script to set the same settings across all your apps.

It took me some time while writing such a script so I thought of sharing it on this blog.

$subscriptionId = "Your_Subscription_Id"    # Your App's SubscriptionId
$webapp = "App Name"                        # Your App's Name
$rg = "Resource Group"                      # Your App's Resource Group

Select-AzureRmSubscription -SubscriptionId $subscriptionId

$autohealRules = @{
    triggers=@{privateBytesInKB=777777;requests=@{count=1000;timeInterval="00:02:39"}};
    actions=@{actionType="Recycle";minProcessExecutionTime="00:01:39"};
}

$PropertiesObject = @{
     autoHealEnabled = $true;
    autoHealRules = $autohealRules
}

Set-AzureRmResource -PropertyObject$PropertiesObject -ResourceGroupName $rg -ResourceType Microsoft.Web/sites/config -ResourceName "$webapp/web" -ApiVersion 2018-02-01 -Force

The above script configures these two auto-heal rules and sets the action to Recyle whenever the conditions are met

1. Whenever Private Bytes for an app cross 777777 KB.
2. Whenever 1000 requests are served in a time interval of 2 minutes 39 seconds.

Note: The script is provided as an example to demonstrate configuring AutoHeal rules via PowerShell. It is in no way recommended for all apps and you should fine tune it per your requirement.

Hope this helps!