How to keep .NET Core console app alive in Docker container - docker

Question

I am testing a .NET Core 2.0 app which uses the Service Bus SDK to retrieve messages from an Event Hub. I setup a console app to do that, and intend to run the app as a Docker container.
This method creates the Event Host Processor which will read the messages:
private static async Task MainAsync(string[] args)
{
Console.WriteLine("Registering EventProcessor...");
var eventProcessorHost = new EventProcessorHost(
EhEntityPath,
PartitionReceiver.DefaultConsumerGroupName,
EhConnectionString,
StorageConnectionString,
StorageContainerName);
// Registers the Event Processor Host and starts receiving messages
Console.WriteLine("Retrieving messages");
await eventProcessorHost.RegisterEventProcessorAsync<EventProcessor>();
Console.WriteLine("Sleeping");
Thread.Sleep(Timeout.Infinite);
}
As the event processor implemented in class EventProcessor will be the one handling the events, I am trying to prevent the console app to exit when the registration of the Processor is finished.
However, I can't find a reliable way to keep the app alive. If I run this container as-is, all I see in the output window is:
Registering EventProcessor...
Retrieving messages
Sleeping
and no messages are ever received.

Answer 1

Thanks all for the suggestions.
I followed those articles but eventually ended up with this, which applies specifically to .NET Core apps:
https://github.com/aspnet/Hosting/issues/870
I've tested it and the app can shutdown gracefully when it receives a termination signal from the Docker runtime.
UPDATE: this is the relevant sample from the GH issue link above:
public class Program
{
public static void Main(string[] args)
{
var ended = new ManualResetEventSlim();
var starting = new ManualResetEventSlim();
AssemblyLoadContext.Default.Unloading += ctx =>
{
System.Console.WriteLine("Unloding fired");
starting.Set();
System.Console.WriteLine("Waiting for completion");
ended.Wait();
};
System.Console.WriteLine("Waiting for signals");
starting.Wait();
System.Console.WriteLine("Received signal gracefully shutting down");
Thread.Sleep(5000);
ended.Set();
}
}