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29 lines
1.3 KiB
Markdown
29 lines
1.3 KiB
Markdown
---
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layout: default
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title: Configuring Log4j
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nav_order: 25
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---
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# Configuring Log4j
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You can configure logging using Log4j in Data Prepper.
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## Logging
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Data Prepper uses [SLF4J](http://www.slf4j.org/) with a [Log4j 2 binding](http://logging.apache.org/log4j/2.x/log4j-slf4j-impl/).
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For Data Prepper versions 2.0 and later, the Log4j 2 configuration file can be found and edited in `config/log4j2.properties` in the application's home directory. The default properties for Log4j 2 can be found in `log4j2-rolling.properties` in the *shared-config* directory.
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For Data Prepper versions before 2.0, the Log4j 2 configuration file can be overridden by setting the `log4j.configurationFile` system property when running Data Prepper. The default properties for Log4j 2 can be found in `log4j2.properties` in the *shared-config* directory.
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### Example
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When running Data Prepper, the following command can be overridden by setting the system property `-Dlog4j.configurationFile={property_value}`, where `{property_value}` is a path to the Log4j 2 configuration file:
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```
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java "-Dlog4j.configurationFile=config/custom-log4j2.properties" -jar data-prepper-core-$VERSION.jar pipelines.yaml data-prepper-config.yaml
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```
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See the [Log4j 2 configuration documentation](https://logging.apache.org/log4j/2.x/manual/configuration.html) for more information about Log4j 2 configuration.
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