Prepare a .Net Core Console App for Docker
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2 minute read
Last week I had the luck to attend the Microsoft Azure OpenHack in Amsterdam. We spent two and a half days learning a lot about kubernetes, Azure Container Services, Azure Container Registry, Azure OMS and Minecraft!
In one of the challenges we decided to implement a sidecar container for logging purposes. So using .NET Core we created a console application with proper handling of the"Control+C" and"Control+Break" key shortcuts.
The following code shows you the structure of the console app we created and will help you Prepare a .Net Core Console App for Docker
using System;
using System.Threading;
using System.Threading.Tasks;
namespace docker.controlc
{
class Program
{
// AutoResetEvent to signal when to exit the application.
private static readonly AutoResetEvent waitHandle = new AutoResetEvent(false);
static void Main(string[] args)
{
// Fire and forget
Task.Run(() =>
{
var random = new Random(10);
while (true)
{
// Write here whatever your side car applications needs to do.
// In this sample we are just writing a random number to the Console (stdout)
Console.WriteLine($"Loop = {random.Next()}");
// Sleep as long as you need.
Thread.Sleep(1000);
}
});
// Handle Control+C or Control+Break
Console.CancelKeyPress += (o, e) =>
{
Console.WriteLine("Exit");
// Allow the manin thread to continue and exit...
waitHandle.Set();
};
// Wait
waitHandle.WaitOne();
}
}
}
Note that we are handling the Console.CancelKeyPress because Docker does not behave as expected if you use the typical Console.ReadKey method to make the application run until a key is pressed.
Get the code here.
Hope it helps!