Using appsettings.json to configure Kestrel listen port Dotnet core 2 preview 2

Question

From what I understand the correct way of setting listen ports for ASP Dotnet Core 2 preview 1/2 is by creating a Kestrel section in the appsettings.json in the following fo

Answer 1

Support for Kestrel configuration via appsettings.json has been dropped in 2.0.

See this issue comment:

kestrel config file support was cut from 2.0.0. Config values need to be read manually in your initialization code.

To get around this, you can do something like this in program.cs:

public static IWebHost BuildWebHost(string[] args) =>
 WebHost.CreateDefaultBuilder(args)
 .UseStartup < Startup > ()
 .UseKestrel((hostingContext, options) => 
 { 
  if (hostingContext.HostingEnvironment.IsDevelopment) {
   options.Listen(IPAddress.Loopback, 9001);
   options.Listen(IPAddress.Loopback, 9002, listenOptions => {
    listenOptions.UseHttps("certificate.pfx", "password");
   });
  }

 })
 .Build();

Answer 2

I know that this is an old post but to run visual studio with kestrel.

just edit the appsettings.json and add the config like this (tested with NetCore 2.0 and 2.1)

    "profiles" : {
        "Kestrel": {
          "commandName": "Project",
          "launchBrowser": true,
          "applicationUrl": "http://localhost:6969/"
        }
    }

Answer 3

I am using Program.cs and hosting.json file to configure Kestrel. Example:

    var config = new ConfigurationBuilder()
                    .SetBasePath(Directory.GetCurrentDirectory())
                    .AddJsonFile("hosting.json", optional: true, reloadOnChange: true)
                    .Build();

    var host = new WebHostBuilder()
                    .UseConfiguration(config)
                    .UseKestrel()
                    .UseContentRoot(Directory.GetCurrentDirectory())
                    .UseStartup<Startup>();

hosting.json:

{
    "urls": "http://localhost:4444;http://localhost:4445;"
}

This above is an example for the latest version dotnet core.

For earlier versions:

hosting.json:

{
    "server.urls": "http://localhost:4444;http://localhost:4445;"
}

Answer 4

I had the same issue whereby my Kestrel configuration in appsettings.json is not being picked up. From this article about migrating from asp.net core 2.0 to 2.1, I updated the bootstraping code to become like the below, and it worked for me.

    public static void Main(string[] args)
    {
        CreateWebHostBuilder(args).Build().Run();
    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args)
    {
        return WebHost.CreateDefaultBuilder(args) 
            .UseStartup<Startup>();
    }

Answer 5

As mentioned in a comment on the accepted answer, 2.1 has support for appsettings.json, see https://blogs.msdn.microsoft.com/webdev/2018/02/02/asp-net-core-2-1-roadmap/#security

A working appsettings.json:

"Kestrel": {
  "EndPoints": {
    "Http": {
      "Url": "http://localhost:5555"
    }
  }
}

This is for a Program.cs using (created by "dotnet new webapi"):

WebHost.CreateDefaultBuilder(args)

Relevant source code in github https://github.com/aspnet/MetaPackages/blob/master/src/Microsoft.AspNetCore/WebHost.cs#L163

options.Configure(builderContext.Configuration.GetSection("Kestrel"));

and https://github.com/aspnet/MetaPackages/blob/master/src/Microsoft.AspNetCore/WebHost.cs#L169

config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)