NLog 不写入 Azure Blob 存储

Question

我是 Azure 的新手，我正在尝试让我在 Azure 上的第一个 MVC Core 3.1 应用程序使用 NLog 写入 Azure Blob 存储。我相信我已经正确设置了它，但我在我的 Blob 存储中没有看到任何东西。

我正在使用以下文章来提供帮助。

https://www.taithienbo.com/securely-log-to-blob-storage-using-nlog-with-connection-string-in-key-vault https://ozaksut.com/custom-logging-with-nlog

当我查看我的 Blob 存储时，我没有看到任何文件。我还假设我的 Blob 存储设置正确。

这是我的 proj 文件的一个片段，显示我有什么应该是正确的 NLog 包。

<ItemGroup>
        <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="5.2.7" />
        <PackageReference Include="Microsoft.EntityFrameworkCore" Version="3.1.10" />
        <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.1.10">
            <PrivateAssets>all</PrivateAssets>
            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
        </PackageReference>
        <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
        <PackageReference Include="NLog.Extensions.AzureBlobStorage" Version="3.0.0" />
        <PackageReference Include="NLog.Web.AspNetCore" Version="4.9.2" />
        <PackageReference Include="Oracle.EntityFrameworkCore" Version="3.19.80" />
        <PackageReference Include="System.Configuration.ConfigurationManager" Version="4.7.0" />
        <PackageReference Include="System.ServiceModel.Duplex" Version="4.4.*" />
        <PackageReference Include="System.ServiceModel.Http" Version="4.4.*" />
        <PackageReference Include="System.ServiceModel.NetTcp" Version="4.4.*" />
        <PackageReference Include="System.ServiceModel.Security" Version="4.4.*" />
    </ItemGroup>

    <ItemGroup>
        <Content Update="nlog.config">
            <CopyToOutputDirectory>Always</CopyToOutputDirectory>
        </Content>
    </ItemGroup>

下面是我的 NLog.config 文件。如果我删除 throwExceptions="true" 然后网站会出现但不会创建日志文件。如果我保留预期，那么我的网站会出错，并且我会在 Azure 日志中看到一个错误，上面写着 Unhandled exception. System.FormatException: Settings must be of the form "name=value". 和

at NLog.Targets.BlobStorageTarget.CloudBlobService.Connect(String connectionString, String serviceUri, String tenantIdentity, String resourceIdentity, IDictionary`2 blobMetadata, IDictionary`2 blobTags)
   at NLog.Targets.BlobStorageTarget.InitializeTarget()
   at NLog.Targets.Target.Initialize(LoggingConfiguration configuration)
   at NLog.Targets.Target.NLog.Internal.ISupportsInitialize.Initialize(LoggingConfiguration configuration)
   at NLog.Config.LoggingConfiguration.InitializeAll()
   at NLog.LogFactory.ReconfigExistingLoggers()
   at NLog.LogFactory.set_Configuration(LoggingConfiguration value)
   at NLog.LogFactory.LoadConfiguration(String configFile)
   at NLog.LogManager.LoadConfiguration(String configFile)
   at NLog.Web.NLogBuilder.ConfigureNLog(String configFileName)

NLog.config 文件

<?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"
      throwExceptions="true">

  <!-- enable asp.net core layout renderers -->
  <extensions>    
    <add assembly="NLog.Extensions.AzureBlobStorage" />
    <add assembly="NLog.Web.AspNetCore"/>
  </extensions>

  <variable name="LogDirectory" value="D:\logs\MvcProjectName"/>

  <!-- the targets to write to -->
  <targets>
    
    <target xsi:type="File" 
      name="DefaultTarget" 
      fileName="${LogDirectory}\LogFile.log"
      layout="${longdate} | ${uppercase:${level}} | ${callsite} | ${message}"
      archiveAboveSize="3145728"  
      archiveEvery="Day"
      archiveFileName = "${LogDirectory}/Archive/{#}.log"  
      archiveNumbering = "DateAndSequence"            
      archiveDateFormat = "yyyyMMdd"  
      maxArchiveFiles = "50"            
    />

    <target xsi:type="AzureBlobStorage"
        name="AzureBlob"
        blobName="Log-${shortdate}.log"
        container="epays-log"
        connectionString="https://myservername.blob.core.windows.net/epays-log"
        layout="${longdate} | ${uppercase:${level}} | ${callsite} | ${message}">
    </target>

    <target name="ConsoleTarget"
      xsi:type="Console"
      layout="${longdate} ${logger:shortName=True} ${message} ${onexception:EXCEPTION OCCURRED\:${exception:format=type,message,StackTrace,method:maxInnerExceptionLevel=8:innerFormat=type,message,StackTrace,method}}"
    />
    
  </targets>  
  <rules>
    <logger name="Microsoft.*" maxlevel="Info" final="true" /> <!-- BlackHole without writeTo -->
    <logger name="*" minlevel="Debug" writeTo="DefaultTarget" />
    <logger name="*" minlevel="Debug" writeTo="AzureBlob" />
    <logger name="*" minlevel="Debug" writeTo="ConsoleTarget" />
  </rules>
</nlog>

当我运行在本地站点时，我可以使用“DefaultTarget”设置让它登录到本地文件结构。

Answer 1

你的配置文件似乎是正确的，但你没有找到你的连接字符串在哪里。

转到您的存储帐户页面，在设置下找到 访问密钥，将连接字符串复制到您的 nlog.config 文件。

这是我这边的示例：

nlog.config 文件内容：

 <?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="C:\temp\fallback-log.txt"
       throwConfigExceptions="true">

   <extensions>
     <add assembly="NLog.Web.AspNetCore"/>
     <add assembly="NLog.Extensions.AzureBlobStorage" />
   </extensions>

   <targets async="true">
     <target
       xsi:type="AzureBlobStorage"
       name="azure"
       layout="${longdate:universalTime=true} ${level:uppercase=true} - ${logger}: ${message} ${exception:format=tostring}"
       connectionString="your-connection-string-goes-here"
       container="logs"
       blobName="${date:universalTime=true:format=yy-MM-dd}.log" />
   </targets>

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

 </nlog>

项目生成的日志文件：

NLog 不写入 Azure Blob 存储

NLog not writing to Azure Blob Storage

nlog

azure

azure-blob-storage

azure-web-app-service