Where does the ASP.NET Core logging API as default store logs?

Question

In the ASP.NET Core 2.0, I use the default logging API. My app is hosted as an Azure Web App.

My question: Where are these outputted? And how do I modify it?

Answer 1

You need to add providers as mentioned later in https://docs.microsoft.com/en-us/aspnet/core/fundamentals/logging/?tabs=aspnetcore2x :

public static void Main(string[] args)
{
    var webHost = new WebHostBuilder()
        .UseKestrel()
        .UseContentRoot(Directory.GetCurrentDirectory())
        .ConfigureAppConfiguration((hostingContext, config) =>
        {
            var env = hostingContext.HostingEnvironment;
            config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                  .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true);
            config.AddEnvironmentVariables();
        })
        .ConfigureLogging((hostingContext, logging) =>
        {
            logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));
            logging.AddConsole();
            logging.AddDebug();
        })
        .UseStartup()
        .Build();

    webHost.Run();
}

For azure you can use the Azure App Service provider (https://www.nuget.org/packages/Microsoft.Extensions.Logging.AzureAppServices)

logging.AddAzureWebAppDiagnostics();