c# - 如何配置 NLog 以写入 Azure 应用服务的日志流？

Question

我正在将 .NET Core 2.2 应用发布到 Azure 应用服务。我已将应用服务配置为将日志保存到 Azure 存储 blob。我正在尝试切换到使用 NLog，因为我无法在这些日志中看到范围。

我已经按照 NLog's documentation 上的指南进行操作；在 .csproj 中添加了 PackageReferences，按照说明更改了 Program.cs，并在 Startup.cs 中删除了对 AddLogging 的调用。当我在本地调试我的应用程序时，我可以看到 NLog 在我的调试日志中输出我期望的内容。当我发布时，日志流仍然像以前一样显示。我的 blob 存储中的日志文件似乎也没有被 NLog 格式化。

内部 NLog 文件没有报告我的目标有任何问题。我可以使用远程调试，我可以看到 NLog 正在写入调试。

我的csproj摘录

  <ItemGroup>
    <None Include="NLog.config">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
    </None>
  </ItemGroup>

我的 NLog.config

<?xml version="1.0"
      encoding="utf-8" ?>

<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      autoReload="true"
      internalLogLevel="Info"
      internalLogFile="./internal-nlog.txt"
      internalLogToConsole="true"
      internalLogToConsoleError="true"
      internalLogToTrace="true"
      internalLogIncludeTimestamp="true"
      throwExceptions="true"
      throwConfigExceptions="true">

  <!-- enable asp.net core layout renderers -->
  <extensions>
    <add assembly="NLog.Web.AspNetCore" />
  </extensions>
  <time type="FastLocal" />
  <!-- the targets to write to -->
  <targets>
    <!-- 2020-04-02 20:00:12.062 +00:00 [Trace] Hangfire.Server.ServerJobCancellationWatcher: No newly aborted jobs found. -->
    <target xsi:type="Console"
            name="ConsoleTarget"
            layout="> ${longdate:universalTime=true} [${level}] ${logger}.${callsite:className=false}:${when:when=length('${ndlc}')>0:inner= [${ndlc}]} ${message} ${exception:format=tostring}"
            encoding="utf-8"
            error="false"
            detectConsoleAvailable="true" />

    <target xsi:type="File"
            name="allfile"
            fileName=".\nlog-all-${shortdate}.log"
            layout="${longdate:universalTime=true} [${level}] ${logger}.${callsite:className=false}:${when:when=length('${ndlc}')>0:inner= [${ndlc}]} ${message} ${exception:format=tostring}" />

    <!-- For Azure Log Stream -->
    <target xsi:type="Trace"
            name="azureLogStream"
            rawWrite="true"
            layout="X ${longdate:universalTime=true} [${level}] ${logger}.${callsite:className=false}:${when:when=length('${ndlc}')>0:inner= [${ndlc}]} ${message} ${exception:format=tostring}" />
  </targets>

  <!-- rules to map from logger name to target -->
  <rules>
    <logger name="Microsoft.EntityFrameworkCore.*"
            level="Information"
            final="true" />
    <logger name="Microsoft.*"
            maxlevel="Information"
            final="true" />
    <logger name="Hangfire.*"
            minlevel="Trace"
            final="true" />

    <!-- BlackHole without writeTo -->
    <logger name="*"
            minlevel="Trace"
            writeTo="azureLogStream,allfile" />

    <logger name="*"
            minlevel="Trace"
            writeTo="ConsoleTarget" />
  </rules>
</nlog>

我已经将 NLog 配置为也写入一个文件，并且可以正常工作。

来自流媒体日志

2020-04-03 17:31:13.241 +00:00 [Information] Microsoft.AspNetCore.Hosting.Internal.WebHost: Request starting HTTP/1.1 GET http://**BEEP**/
2020-04-03 17:31:13.242 +00:00 [Information] Microsoft.AspNetCore.Hosting.Internal.WebHost: Request finished in 6.3456ms 404

来自NLog制作的日志文件

2020-04-03 16:02:59.9714 [Info] Namespace.Class.McWritey: [RequestId:800022a7-0000-e300-b63f-84710c7967bb RequestPath:/signalr/notifications TransportConnectionId:-qK6yuSdbcbr5PDDXJ-EBQ [Id: `ac5c3f80-456a-48b5-9122-6836f911e141`]] CloseFile File Closed by -qK6yuSdbcbr5PDDXJ-EBQ
2020-04-03 16:03:00.5218 [Info] Namespace.Class.McWritey: [RequestId:800022a7-0000-e300-b63f-84710c7967bb RequestPath:/signalr/notifications TransportConnectionId:-qK6yuSdbcbr5PDDXJ-EBQ] OnDisconnectedAsync Client Disconnected: -qK6yuSdbcbr5PDDXJ-EBQ

当我将 VS 附加到我发布的应用程序时从调试日志中获取

X 2020-04-03 17:39:19.1176 [Info] Namespace.Class.McWritey: [RequestId:8000161a-0000-f400-b63f-84710c7967bb RequestPath:/signalr/notifications TransportConnectionId:7ML3GmVzsm7mHPBl0sB-GA] OnConnectedAsync Client Connected: 7ML3GmVzsm7mHPBl0sB-GA 

Answer 1

是的，看起来像 ASP.NET Core，然后 System.Diagnostics.Trace 不会重定向到应用程序诊断日志。它仅适用于经典的 ASP.NET。

您可以 activate log stream from log-files , 因此它将监视存储在 HOME 文件夹中的任何以 .txt 或 .log 结尾的文件。然后你可以使用一个文件目标:

<?xml version="1.0" encoding="utf-8"?>
<nlog>
   <targets async="true">
      <target name="logfile" xsi:type="File" filename="${environment:HOME:cached=true}/logfiles/application/app-${shortdate}-${processid}.txt" />
   </targets>
   <rules>
      <logger name="*" minlevel="Info" writeTo="logfile" />
   </rules>
</nlog>

另请参阅:https://github.com/NLog/NLog.Extensions.Logging/wiki/NLog-cloud-logging-with-Azure-function-or-AWS-lambda#writing-to-azure-diagnostics-log-stream