Program.cs

using System;
using System.Collections.Generic;
using System.IO;
using Microsoft.AspNetCore.Hosting;
using Serilog;
using Serilog.Events;
using Serilog.Sinks.SystemConsole.Themes;

namespace IdSrvHost
{
    public class Program
    {

        public static void Main(string[] args)
        {
            Console.Title = "IdentityServer";

            var host = new WebHostBuilder()
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseStartup<Startup>()
                .UseSerilog((context, config) =>
                {
                    config
                        .MinimumLevel.Debug()
                        .MinimumLevel.Override("Microsoft", LogEventLevel.Warning)
                        .MinimumLevel.Override("System", LogEventLevel.Warning)
                        .MinimumLevel.Override("Microsoft.AspNetCore.Authentication", LogEventLevel.Information)
                        .Enrich.FromLogContext()
                        //.WriteTo.File(@"identityserver4_log.txt")
                        .WriteTo.Console(
                            outputTemplate:
                            "[{Timestamp:HH:mm:ss} {Level}] {SourceContext}{NewLine}{Message:lj}{NewLine}{Exception}{NewLine}",
                            theme: AnsiConsoleTheme.Literate);
                })
                .ConfigureKestrel((context, options) =>
                {
                    // Set properties and call methods on options
                })
                .Build();

            host.Run();
        }
    }
}