如何让.net core 2.1 Web应用程序在2个端口上侦听

Question

我有一个.net core 2.1 Web服务，正在尝试与Docker一起运行。我正在尝试在端口8081上公开我的App Metrics运行状况检查，并在端口80上公开其余的Web服务api。

当我进行docker构建并在dotnet publish文件夹上运行时，出现以下错误。正确的方法是什么？

Hosting /metrics on port 8081
Hosting /metrics-text endpoint on port 8081
Hosting /env endpoint on port 8081
Configured platform region: us-west-2
warn: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[35]
    No XML encryptor configured. Key {d1abbb8a-2891-46d5-949b-0716020eb2a0} may be persisted to storage in unencrypted form.
crit: Microsoft.AspNetCore.Server.Kestrel[0]
    Unable to start Kestrel.
System.InvalidOperationException: A path base can only be configured using IApplicationBuilder.UsePathBase().
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.ParseAddress(String address, Boolean& https)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.AddressesStrategy.BindAsync(AddressBindContext context)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.BindAsync(IServerAddressesFeature addresses, KestrelServerOptions serverOptions, ILogger logger, Func`2 createBinding)
at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.StartAsync[TContext](IHttpApplication`1 application, CancellationToken cancellationToken)
crit: Microsoft.AspNetCore.Server.Kestrel[0]
    Unable to start Kestrel.
System.InvalidOperationException: A path base can only be configured using IApplicationBuilder.UsePathBase().
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.ParseAddress(String address, Boolean& https)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.AddressesStrategy.BindAsync(AddressBindContext context)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.BindAsync(IServerAddressesFeature addresses, KestrelServerOptions serverOptions, ILogger logger, Func`2 createBinding)
at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.StartAsync[TContext](IHttpApplication`1 application, CancellationToken cancellationToken)

Unhandled Exception: System.InvalidOperationException: A path base can only be configured using IApplicationBuilder.UsePathBase().
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.ParseAddress(String address, Boolean& https)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.AddressesStrategy.BindAsync(AddressBindContext context)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.BindAsync(IServerAddressesFeature addresses, KestrelServerOptions serverOptions, ILogger logger, Func`2 createBinding)
at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.StartAsync[TContext](IHttpApplication`1 application, CancellationToken cancellationToken)
at Microsoft.AspNetCore.Hosting.Internal.WebHost.StartAsync(CancellationToken cancellationToken)
at Microsoft.AspNetCore.Hosting.WebHostExtensions.RunAsync(IWebHost host, CancellationToken token, String shutdownMessage)
at Microsoft.AspNetCore.Hosting.WebHostExtensions.RunAsync(IWebHost host, CancellationToken token)
at Microsoft.AspNetCore.Hosting.WebHostExtensions.Run(IWebHost host)
at EmailService.Program.Main(String[] args)

这是我的设置...

Dockerfile

FROM microsoft/dotnet:2.1-aspnetcore-runtime
WORKDIR /app
COPY . .
ENV ASPNETCORE_URLS http://+:80,http://+8081
ENTRYPOINT ["dotnet", "MyService.dll"]
EXPOSE 80 8081

Program.cs

using App.Metrics;
using App.Metrics.AspNetCore;
using App.Metrics.AspNetCore.Health;
using App.Metrics.Formatters.Prometheus;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;

namespace MyService
{
    public class Program
    {
        public static void Main(string[] args)
        {
            BuildWebHost(args).Run();
            //args run loop 
        }
        public static IMetricsRoot Metrics { get; set; }

        public static IWebHost BuildWebHost(string[] args)
        {
            Metrics = AppMetrics.CreateDefaultBuilder()
                .OutputMetrics.AsPrometheusPlainText()
                .Build();

            return WebHost.CreateDefaultBuilder(args)
                .ConfigureMetrics(Metrics)
                .UseMetrics(
                    options =>
                    {
                        options.EndpointOptions = endpointsOptions =>
                {
                            endpointsOptions.MetricsTextEndpointOutputFormatter = new MetricsPrometheusTextOutputFormatter(); 
                        };
                    }
                )
                .ConfigureAppMetricsHostingConfiguration(options =>
                {
                    options.AllEndpointsPort = 8081;
                    options.MetricsEndpoint = "/metrics";
                })
                .ConfigureAppHealthHostingConfiguration(options =>
                {
                    options.HealthEndpoint = "/healthcheck";
                    options.PingEndpoint = "/ping";
                })
                .UseHealthEndpoints(options => { options.HealthEndpointOutputFormatter = new Core.HealthChecks.HealthCheckStatusFormatter(); })
                .UseHealth()
                .UseMetricsEndpoints()
                .UseStartup<Startup>()
                .Build();
        }
    }
}