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c# - docker-compose 无法向外部网络请求

问题描述

我被困在问题上。我知道这可能是一个糟糕的问题，但我无能为力。我有一些这样的代码测试：

        [HttpGet]
        public async Task<object> Get()
        {
            try
            {
                Console.WriteLine("Start");
                HttpClient httpClient = new HttpClient()
                {
                    BaseAddress = new Uri("https://pikbest.com")
                };
                Console.WriteLine("Start call");
                var response = await httpClient.GetStringAsync("?m=download&id=123&flag=1&free_zone=0");
                Console.WriteLine("Call ok");
            } catch(Exception ex)
            {
                Console.WriteLine($"Exception: {ex.InnerException}\n{ex.Message}\n{ex.StackTrace}");
                return "Not ok";

            }
            return "Ok";
        }

当我Docker只跑时，它是 return Ok。但是当我跑时Docker-compose，它是 return Not ok。

Dockerfile：

FROM mcr.microsoft.com/dotnet/core/sdk:3.1 as build
WORKDIR /app
COPY . ./
RUN dotnet restore
RUN dotnet publish -c Release -o ./publish

FROM mcr.microsoft.com/dotnet/core/aspnet:3.1
WORKDIR /app
COPY --from=build /app/publish .
EXPOSE 80/tcp
ENTRYPOINT ["dotnet", "testhttpclient.dll"]

这是docker-compose.yml：

version: "3"

services:
    serverside:
        build: ./testhttpclient
        container_name: testhttpclient
        ports:
            - '80:80'

这是 Console.Write 日志：

testhttpclient | Start
testhttpclient | Start call
testhttpclient | Exception: System.Net.Sockets.SocketException (11): Resource temporarily unavailable
testhttpclient |    at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
testhttpclient | Resource temporarily unavailable
testhttpclient |    at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
testhttpclient |    at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean allowHttp2, CancellationToken cancellationToken)
testhttpclient |    at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
testhttpclient |    at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
testhttpclient |    at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
testhttpclient |    at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
testhttpclient |    at System.Net.Http.DiagnosticsHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
testhttpclient |    at System.Net.Http.HttpClient.FinishSendAsyncUnbuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
testhttpclient |    at System.Net.Http.HttpClient.GetStringAsyncCore(Task`1 getTask)
testhttpclient |    at testhttpclient.Controllers.WeatherForecastController.Get() in /app/Controllers/WeatherForecastController.cs:line 40
tController.Get(                                                                                                             ) in /app/Controllers/WeatherForecastController.cs:line 40

真的很谢谢你！

标签： c#dockerdocker-composehttpclient

解决方案

尝试将网络模式添加到docker-compose.yml：

version: "3"

services:
    serverside:
        build: ./testhttpclient
        container_name: testhttpclient
        network_mode: "host"
        ports:
            - '80:80'

如果这不起作用，请尝试network_mode：bridge

或创建一个网络：

version: "3"

services:
    serverside:
        build: ./testhttpclient
        container_name: testhttpclient
        ports:
            - '80:80'
        networks:
            - "serverside_nw"

networks:
  serverside_nw:
    external: true

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