无法从 Docker 中的 .NET CORE Web API 连接到 WCF 服务答案

【问题标题】：Can't conncet to WCF service from .NET CORE Web API in Docker无法从 Docker 中的 .NET CORE Web API 连接到 WCF 服务
【发布时间】：2019-11-24 07:40:09
【问题描述】：

我有 WCF 服务。接下来，我有 .NET CORE WEB API 项目。 Web API 调用 WCF 服务。在本地 evrything 工作正常。然后我将 Web API 放入 docker 容器中，Web API 可以工作，但它无法与 WCF 服务通信。

在过去的版本中，所有东西都可以正常使用 docker。我检查了，docker 容器可以访问互联网（ping、wget...）。

Dcoker 版本：

Client: Docker Engine - Community
 Version:           18.09.2
 API version:       1.39
 Go version:        go1.10.8
 Git commit:        6247962
 Built:             Sun Feb 10 04:12:31 2019
 OS/Arch:           windows/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.2
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.6
  Git commit:       6247962
  Built:            Sun Feb 10 04:13:06 2019
  OS/Arch:          linux/amd64
  Experimental:     false

来自 API 的错误：

 An unhandled exception was thrown by the application.
System.ServiceModel.CommunicationException: Cannot assign requested address 
---> System.Net.Http.HttpRequestException: Cannot assign requested address
---> System.Net.Sockets.SocketException: Cannot assign requested address
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.CreateConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.WaitForCreatedConnectionAsync(ValueTask`1 creationTask)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.DecompressionHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.ServiceModel.Channels.ServiceModelHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncUnbuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpClientRequestChannel.HttpClientChannelAsyncRequest.SendRequestAsync(Message message, TimeoutHelper timeoutHelper)
   --- End of inner exception stack trace ---
   at System.Runtime.AsyncResult.End[TAsyncResult](IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.SendAsyncResult.End(SendAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannelProxy.TaskCreator.<>c__DisplayClass1_0.<CreateGenericTask>b__0(IAsyncResult asyncResult)

这是我的 docker 文件 - 之前使用的文件相同：

FROM microsoft/dotnet:2.1-aspnetcore-runtime-stretch-slim AS base
WORKDIR /app
EXPOSE 80
COPY ["BlackFoxWebAPI/KerasEvaluator.zip", "/app/"]
FROM microsoft/dotnet:2.1-sdk-stretch AS build
WORKDIR /src
COPY ["BlackFoxWebAPI/BlackFoxWebAPI.csproj", "BlackFoxWebAPI/"]
COPY ["BlackFoxWebAPIModels/BlackFoxWebAPIModels.csproj", "BlackFoxWebAPIModels/"]
COPY ["KerasAPIClient/KerasAPIClient.csproj", "KerasAPIClient/"]
RUN dotnet restore "BlackFoxWebAPI/BlackFoxWebAPI.csproj"
COPY . .

WORKDIR "/src/BlackFoxWebAPI"
RUN dotnet build "BlackFoxWebAPI.csproj" -c Release -o /app

FROM build AS publish
RUN dotnet publish "BlackFoxWebAPI.csproj" -c Release -o /app

FROM base AS final
WORKDIR /app
COPY --from=publish /app .

ENTRYPOINT ["dotnet", "BlackFoxWebAPI.dll"]

【问题讨论】：

您在哪里托管 wcf 服务？如果您请求一个不调用 wcf 服务的方法，它会起作用吗？尝试运行docker logs containername 并与我们分享结果。
@TaoZhou 1. wcf 服务托管在远程机器上 - 而不是在 docker 中。 2. 如果请求一个不调用 wcf 服务的方法，它可以工作 3. API 错误： 是来自容器的日志
把请求wcf服务的代码分享给我们，你们为wcf服务实现了安全吗？

标签： c# docker wcf asp.net-core-2.0 asp.net-core-webapi

【解决方案1】：

已解决

问题在于在 Visual Studio 中设置服务引用。在ConnectedService.json 中更改 WCF 地址后，您必须为每个环境更新 Microsoft WCF 提供程序。我没有更新 docker relese env，relese 使用了一些旧参考 - NOT 来自ConnectedService.json 的参考。

【讨论】：