Pfthb

I have created an ASP.Net Core 2.1 WebApp that has a single HostedService to run a background process, the process can take up to 20 seconds to complete once a cancelation token has been cancelled. This all works fine locally when run on IIS Express - the StopAsync() method is called when the IIS Express site is stopped and waits for the process to complete before the application is terminated.

When I run this app in an Azure App Service it does not shutdown or restart gracefully the StopAsync() is called but the application is killed within a few seconds not allowing the application to shutdown gracefully.

I have tried adding the following in web.config:

<aspNetCore shutdownTimeLimit="90" processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".logsstdout">

And the following in Program.cs but this had no effect:

public static IWebHostBuilder CreateWebHostBuilder(string args) =>
 WebHost.CreateDefaultBuilder(args)
 .UseStartup<Startup>()
 .UseShutdownTimeout(TimeSpan.FromSeconds(90));

Are there any other settings I need to set in an Azure App Service to increase the Shutdown timeout?

Many thanks.

If we want to gracefully shut down the webapp, we could inject IApplicationLifetime and use the property ApplicationStopping in the Startup.cs

IApplicationLifetime is a new interface in ASP.NET Core under the Microsoft.AspNetCore.Hosting namespace. The interface is designed to give a developer the opportunity to gracefully startup but mostly shutdown the application.

Demo code

public void Configure(IApplicationBuilder app, IHostingEnvironment env,IApplicationLifetime applicationLifetime)
 
 ...
 applicationLifetime.ApplicationStopping.Register(OnShutdown);
 ...

private void OnShutdown()

 //todo