Deploy Azure App Service with multiple Virtual Applications

 Check the below steps to deploy multiple Virtual Applications to Azure App Service from Visual Studio 2022.

• Create a new App Service in Azure Portal.

• In App Service Overview, click on the Download publish profile.

In VS 2022, create Applications of your desired framework. I have taken .NET Core Apps as an example.

Visual Studio Project Folder Structure

The option to create Virtual Directories in Azure Portal is available only for Azure Windows App Service.

In Azure Portal => App Service => Configuration => Path mappings => Under Virtual applications and directories create New Virtual application.

Make sure the Virtual Path is same as Web App Name in VisualStudio.

Publish each Application in VS to Azure App Service using the Downloaded Publish Profile.

Right click on the 1st WebApp Project => Publish => Add a publish profile => Import Profile.

Browse and upload the Publish Profile which we have downloaded from Azure Portal App Service.

Change the settings of the Application.

The site name must be the App Service name/VirtualPathName which we have created in portal. Ex: Here it is VirtualApps29Dec/WebApp1.

Save and continue with next steps to publish the App.

Follow the same steps with the same Publish Profile for WebApp2, WebApp3 and WebApp4 as well.

Deployed Azure App Service Structure in KUDU Console

The Url's for the Applications will be

https://virtualapps29dec.azurewebsites.net/WebApp1

https://virtualapps29dec.azurewebsites.net/WebApp2

https://virtualapps29dec.azurewebsites.net/WebApp3

https://virtualapps29dec.azurewebsites.net/WebApp4

Initially When I tried to access the Applications, I got the below error.

When I check the Web.config of the deployed Applications, I can see the below code.

<?xml version="1.0" encoding="utf-8"?>

<configuration>

  <location path="." inheritInChildApplications="false">

    <system.webServer>

      <handlers>

        <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />

      </handlers>

      <aspNetCore processPath="dotnet" arguments=".\WebApp2.dll" stdoutLogEnabled="false" stdoutLogFile="\\?\%home%\LogFiles\stdout" hostingModel="inprocess" />

    </system.webServer>

  </location>

</configuration>

AspNetCoreModuleV2 will not allow multiple In-process virtual apps within the same app service plan.

I have resolved the issue by changing AspNetCoreModuleV2 to AspNetCoreModule

Edit all the Web.config files under the deployed Applications.