使用CloudWatch的log4net，无法在控制台中查看我的日志

Question

我使用的是Here中的示例

我的log4net配置如下所示：

    <configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
  </configSections>
<log4net debug="true">
  <appender name="AWS" type="AWS.Logger.Log4net.AWSAppender,AWS.Logger.Log4net">
    <LogGroup>MY_Logs</LogGroup>    
    <Region>us-west-2</Region>
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%-4timestamp [%thread] %-5level %logger %ndc - %message%newline" />
    </layout>
  </appender>
  <root>
    <level value="ALL"/>
    <appender-ref ref="AWS" />
  </root>
</log4net>
</configuration>

我的app.config：

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <appSettings>
    <add key="AWSProfilesLocation" value="awscredentials" />
    <add key="AWSRegion" value="us-west-2" />
  </appSettings>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
    </startup>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="log4net" publicKeyToken="669e0ddf0bb1aa2a" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.0.8.0" newVersion="2.0.8.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

我的磨牙

[default]
aws_access_key_id=[my_id]
aws_secret_access_key=[my_access_key]

以下是我的控制台应用程序上的调试信息：

  log4net: Configuration update mode [Merge].
log4net: Logger [root] Level string is [ALL].
log4net: Logger [root] level set to [name="ALL",value=-2147483648].
log4net: Loading Appender [AWS] type: [AWS.Logger.Log4net.AWSAppender,AWS.Logger
.Log4net]
log4net: Setting Property [LogGroup] to String value [MY_Logs]
log4net: Setting Property [Region] to String value [us-west-2]
log4net: Converter [message] Option [] Format [min=-1,max=2147483647,leftAlign=F
alse]
log4net: Converter [newline] Option [] Format [min=-1,max=2147483647,leftAlign=F
alse]
log4net: Setting Property [ConversionPattern] to String value [%-4timestamp [%th
read] %-5level %logger %ndc - %message%newline]
log4net: Converter [timestamp] Option [] Format [min=4,max=2147483647,leftAlign=
True]
log4net: Converter [literal] Option [ [] Format [min=-1,max=2147483647,leftAlign
=False]
log4net: Converter [thread] Option [] Format [min=-1,max=2147483647,leftAlign=Fa
lse]
log4net: Converter [literal] Option [] ] Format [min=-1,max=2147483647,leftAlign
=False]
log4net: Converter [level] Option [] Format [min=5,max=2147483647,leftAlign=True
]
log4net: Converter [literal] Option [ ] Format [min=-1,max=2147483647,leftAlign=
False]
log4net: Converter [logger] Option [] Format [min=-1,max=2147483647,leftAlign=Fa
lse]
log4net: Converter [literal] Option [ ] Format [min=-1,max=2147483647,leftAlign=
False]
log4net: Converter [ndc] Option [] Format [min=-1,max=2147483647,leftAlign=False
]
log4net: Converter [literal] Option [ - ] Format [min=-1,max=2147483647,leftAlig
n=False]
log4net: Converter [message] Option [] Format [min=-1,max=2147483647,leftAlign=F
alse]
log4net: Converter [newline] Option [] Format [min=-1,max=2147483647,leftAlign=F
alse]
log4net: Setting Property [Layout] to object [log4net.Layout.PatternLayout]
log4net: Creating repository for assembly [AWSSDK.Core, Version=3.3.0.0, Culture
=neutral, PublicKeyToken=885c28607f98e604]
log4net: Assembly [AWSSDK.Core, Version=3.3.0.0, Culture=neutral, PublicKeyToken
=885c28607f98e604] Loaded From [C:\Users\stal\documents\visual studio 2017\Proje
cts\ConsoleApp9\ConsoleApp9\bin\Debug\AWSSDK.Core.dll]
log4net: Assembly [AWSSDK.Core, Version=3.3.0.0, Culture=neutral, PublicKeyToken
=885c28607f98e604] does not have a RepositoryAttribute specified.
log4net: Assembly [AWSSDK.Core, Version=3.3.0.0, Culture=neutral, PublicKeyToken
=885c28607f98e604] using repository [log4net-default-repository] and repository
type [log4net.Repository.Hierarchy.Hierarchy]
log4net: repository [log4net-default-repository] already exists, using repositor
y type [log4net.Repository.Hierarchy.Hierarchy]
log4net: Creating repository for assembly [AWSSDK.CloudWatchLogs, Version=3.3.0.
0, Culture=neutral, PublicKeyToken=885c28607f98e604]
log4net: Assembly [AWSSDK.CloudWatchLogs, Version=3.3.0.0, Culture=neutral, Publ
icKeyToken=885c28607f98e604] Loaded From [C:\Users\stal\documents\visual studio
2017\Projects\ConsoleApp9\ConsoleApp9\bin\Debug\AWSSDK.CloudWatchLogs.dll]
log4net: Assembly [AWSSDK.CloudWatchLogs, Version=3.3.0.0, Culture=neutral, Publ
icKeyToken=885c28607f98e604] does not have a RepositoryAttribute specified.
log4net: Assembly [AWSSDK.CloudWatchLogs, Version=3.3.0.0, Culture=neutral, Publ
icKeyToken=885c28607f98e604] using repository [log4net-default-repository] and r
epository type [log4net.Repository.Hierarchy.Hierarchy]
log4net: repository [log4net-default-repository] already exists, using repositor
y type [log4net.Repository.Hierarchy.Hierarchy]
log4net: Created Appender [AWS]
log4net: Adding appender named [AWS] to logger [root].
log4net: Hierarchy Threshold []

我在调试信息中没有看到任何异常。

查看我的aws cloudwatch控制台，我没有看到组My_Logs。

我有查看/写入cloudwatch的权限。

有什么想法吗？

Answer 1

我遇到了一个类似的问题，我的log4net日志没有写入CloudWatch，尽管它看起来配置是正确的。我可以通过将以下内容添加到附加器节点来启用AWS.Logger.Log4net的日志记录功能，从而找到问题(在我的示例中，我缺少一些配置设置

<LibraryLogFileName>c:\logs\awslog.txt</LibraryLogFileName>

因此，在您的示例中，新的配置部分将如下所示

<appender name="AWS" type="AWS.Logger.Log4net.AWSAppender,AWS.Logger.Log4net">
 <LogGroup>MY_Logs</LogGroup>    
 <Region>us-west-2</Region>
 <layout type="log4net.Layout.PatternLayout">
   <conversionPattern value="%-4timestamp [%thread] %-5level %logger %ndc - %message%newline" />
 </layout>
 <LibraryLogFileName>c:\logs\awslog.txt</LibraryLogFileName>
</appender>

只需确保快速检查日志文件，在我的例子中，它的大小增加得相当快。希望日志文件中的错误消息能为您指出问题所在。

Answer 2

根据documentation的说法：

为了将配置数据嵌入到.config文件中，必须使用configSections元素向.NET配置文件解析器标识节名。该节必须指定将用于解析配置节的log4net.Config.Log4NetConfigurationSectionHandler。

它在您的配置文件中缺失。因此，添加以下内容：

<configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>