c# - Azure IoT Edge ClientModule 无法在主机模式下连接

问题描述

正如 IoT Edge 初学者开发人员所期望的那样，我开始关注 Microsoft 教程，了解如何将自定义代码部署到 IoT Edge 服务器教程：为 Linux 设备开发 C# IoT Edge 模块。

我能够在工业英特尔 PC 上安装 Ubuntu 18.04 服务器，下载和配置 edgeHub 和 edgeAgent 模块，创建免费的 Azure 和 Docker Hub 帐户等。甚至教程中的示例代码也成功构建并部署到我的目标设备一切看起来都很好，所有模块都在互相交谈，等等。

运行演示代码后，我开始修改代码以更好地满足我的最终目标，即捕获我们使用 UDP 多播/广播的工业设备生成的网络流量。显然我需要将我的 docker 映像配置为在“主机”网络模式下运行。事实上，当我告诉 azure edgeAgent 以主机模式启动模块容器时，UDP 数据包就开始进来了。

但是，现在我的示例模块不再能够连接到 iot 集线器，我完全不知所措。我也尝试在主机模式下运行 edgeHub 容器，这似乎没有任何区别。由于 ModuleClient.OpenAsync 方法，我得到的确切错误是：

    Unhandled exception. System.AggregateException: One or more errors occurred. (Transient network error occurred, please retry.)
 ---> Microsoft.Azure.Devices.Client.Exceptions.IotHubCommunicationException: Transient network error occurred, please retry.
 ---> System.Net.Internals.SocketExceptionFactory+ExtendedSocketException (00000005, 0xFFFDFFFF): Name or service not known
   at System.Net.Dns.InternalGetHostByName(String hostName)
   at System.Net.Dns.ResolveCallback(Object context)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Exception source)
   at System.Net.Dns.HostResolutionEndHelper(IAsyncResult asyncResult)
   at System.Net.Dns.EndGetHostAddresses(IAsyncResult asyncResult)
   at System.Net.Dns.<>c.<GetHostAddressesAsync>b__25_1(IAsyncResult asyncResult)
   at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.Azure.Devices.Client.Transport.Mqtt.MqttTransportHandler.OpenAsyncInternal(CancellationToken cancellationToken)
   at Microsoft.Azure.Devices.Client.Transport.Mqtt.MqttTransportHandler.OpenAsync(CancellationToken cancellationToken)
   at Microsoft.Azure.Devices.Client.Transport.ProtocolRoutingDelegatingHandler.OpenAsync(CancellationToken cancellationToken)
   at Microsoft.Azure.Devices.Client.Transport.ErrorDelegatingHandler.<>c__DisplayClass23_0.<<ExecuteWithErrorHandlingAsync>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.Azure.Devices.Client.Transport.ErrorDelegatingHandler.ExecuteWithErrorHandlingAsync[T](Func`1 asyncOperation)
   --- End of inner exception stack trace ---
   at Microsoft.Azure.Devices.Client.Transport.ErrorDelegatingHandler.ExecuteWithErrorHandlingAsync[T](Func`1 asyncOperation)
   at Microsoft.Azure.Devices.Client.Transport.RetryDelegatingHandler.<>c__DisplayClass33_0.<<OpenInternalAsync>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.Azure.Devices.Client.Transport.RetryDelegatingHandler.EnsureOpenedAsync(CancellationToken cancellationToken)
   at Microsoft.Azure.Devices.Client.InternalClient.OpenAsync()
   at SampleModule.Program.Init() in /app/SampleModule/Program.cs:line 54
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at SampleModule.Program.Main(String[] args) in /app/SampleModule/Program.cs:line 26

用于连接的代码：

ITransportSettings[] settings = { mqttSetting };
ModuleClient ioTHubModuleClient = await ModuleClient.CreateFromEnvironmentAsync(settings);
await ioTHubModuleClient.OpenAsync();
Console.WriteLine("IoT Hub module client initialized.");

因此，显然 ModuleClient 无法再找到 edgeHub（名称或服务未知？）。我知道'CreateFromEnvironmentAsync'使用由edgeAgent设置的环境变量，但是哪些？有人知道这是为什么吗？即使是在正确方向上开始调试此问题的指针也非常感谢！

如果我将 docker 容器改回“桥”网络，OpenAsync 方法可以完美运行，但我的 UDP 广播消息当然不再接收。

标签： c#azuredocker.net-coreazure-iot-hub

c# - Azure IoT Edge ClientModule 无法在主机模式下连接

问题描述

解决方案

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