Handling SIGTERM in asp.net core middleware in docker container

[meanin]

Hi All,
is it possible at all? I created simple asp.net core application here. The application is running in linux docker container. Now, I am trying to implement graceful shutdown, with waiting for current request completion. I tried many different ways, starts from AppDomain.CurrentDomain.ProcessExit += OnProcessExit, going trough Console.CancelKeyPress += ConsoleOnCancelKeyPress and finished on AssemblyLoadContext.Default.Unloading += OnUnloading. I tried to place it inside a middleware as well as on top of program.cs. I am stoping docker with command below:
docker stop -t 30 containerId
Docker documentation says, that this should cause SIGTERM on a first try, wait given time and raise SIGKILL.

I already saw issues:
aspnet/Hosting#870
https://github.com/aspnet/Hosting/issues/1527
https://github.com/dotnet/coreclr/issues/2688
https://github.com/dotnet/coreclr/issues/8565

Any guess?

[davidfowl]

Graceful shutdown already works out of the box with ASP.NET Core so there’s no need to re-implement it.

[meanin]

Is this the reason, why I cannot get any of these events while debbuging?

[davidfowl]

Maybe? I’m not sure about that but I know you can delete your code because it’s handled

[meanin]

Hi again,
Thank you for your interest in my issue. I will skip graceful handling right now, but I want to understand, how to handle sigterm in my app.

I've created a simple demo here, which is not working, unfortunately. I am going to work on that further in some free time and update this thread :)
Regards

[meanin]

Tested in a 2 .net core application:

1. generic host here
2. generic host alongside with asp.net application here

In both cases, I wasn't able to catch this while debugging, while running container in interactive mode shows log messages on all events.

The last thing that I want to test is IApplicationLifetime on docker container interactive. I suspect that it will be working, but again, I won't be able to debug.

Regards

[meanin]

I can confirm that all of the solutions are working on docker run -it mode. Issue closed.

[davidfowl]

@meanin great!