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I recently ran into a scenario where I needed to script the installation of a site extension into an existing Azure Web App. Typically, I would use an Azure ARM deployment to accomplish this but in this particular situation that wasn't going to work.

I wanted to install the site extension that enables Application Insights Monitoring of a live website. After digging into existing arm templates, I found the name of that extension is Microsoft.ApplicationInsights.AzureWebSites.

After searching for way too long, I eventually found PowerShell command I needed on a forum somewhere. I can't find it again so I'm posting this here in hopes that it will be easier for others to find in the future.

Installing a site extension to an existing App Service Web App

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New-AzureRmResource -ResourceType "Microsoft.Web/sites/siteextensions" -ResourceGroupName MyResourceGroup -Name "MyWebApp/SiteExtensionName" -ApiVersion "2018-02-01" -Force

For example, given a resource group named Test, a web app named testsite and a site extension named Microsoft.ApplicationInsights.AzureWebSites.

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New-AzureRmResource -ResourceType "Microsoft.Web/sites/siteextensions" -ResourceGroupName "Test" -Name "testsite/Microsoft.ApplicationInsights.AzureWebSites" -ApiVersion "2018-02-01" -Force

Installing a site extension to a Web App Deployment Slot

The scenario I ran into was actually attempting to add this site extension to a deployment slot. When you create a deployment slot, it doesn't copy over any existing site extensions, which is a problem because when you swap your new slot to production, your new production slot ends up losing the site extensions that were in the old production slot.

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New-AzureRmResource -ResourceType "Microsoft.Web/sites/slots/siteextensions" -ResourceGroupName MyResourceGroup -Name "MyWebApp/SlotName/SiteExtensionName" -ApiVersion "2018-02-01" -Force

Using the same example as above and a slot named Staging:

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New-AzureRmResource -ResourceType "Microsoft.Web/sites/slots/siteextensions" -ResourceGroupName "Test" -Name "testsite/Staging/Microsoft.ApplicationInsights.AzureWebSites" -ApiVersion "2018-02-01" -Force