Nlog to aws cloudwatch not working when passing lookup values

[hareeshmakani]

<?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:\LogsDemo\NLogs\internal-nlog.txt">

    <extensions>
        <add assembly="NLog.AWS.Logger" />
    </extensions>

    <targets>
        <target name="aws" type="AWSTarget" logGroup="NLog.ConfigExample2" profile="'${var:profile}'" region="'${var:region}'"/>        
    </targets>

    <rules>
        <logger name="*" minlevel="Info" writeTo="aws" />
    </rules>
</nlog>

The above code to log data into aws cloudwatch is not working when I try to pass region & profile values from startup class.

    LogManager.Configuration.Variables["region"] = "ap-south-1";
    LogManager.Configuration.Variables["profile"] = "default";

However when I hardcoded the values it's working.

<target name="aws" type="AWSTarget" logGroup="NLog.ConfigExample" profile="default" region="ap-south-1"/>

[snakefoot]

See also advice given here: https://github.com/NLog/NLog/issues/4841

[ashishdhingra]

Hi @hareeshmakani,

Good morning.

Thanks for posting the question.

Few things to note about dynamic variables:

• Per NLog: Configuration file: Variables, Dynamic mode only works for properties of the type NLog Layout.
• Per NLog: Update config in code, it actually reapplies the updated configuration to LogManager.Configuration. This support the input shared by @snakefoot in https://github.com/aws/aws-logging-dotnet/issues/51#issuecomment-440839779.

Does the guidance shared by @snakefoot doesn't work for you. Based on 2nd point above, this issue doesn't appear to be an issue with the AWS.Logger.Nlog package (it is really a wrapper around NLog library), but rather investigation/guidance on how NLog configuration works.

Thanks, Ashish

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