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Add Logs to doc website repo. (#1944) 

* Add Logs to doc website repo.

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* Minor copy edits, added one heading.

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* Update _data-prepper/logs.md

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* Minor heading changes.

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* Incorporated technical feedback.

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* Minor technical feedback incorporated.

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* Added comments for editorial.

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---
layout: default
title: Log4j configuration
nav_order: 12
---
# Log4j configuration
This section provides information about configuring Log4j.
## Logging
The following describes how Data Prepper performs logging. Data Prepper uses [SLF4J](http://www.slf4j.org/) with a [Log4j 2 binding](http://logging.apache.org/log4j/2.x/log4j-slf4j-impl/).
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.
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.
### Example
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:
```
java "-Dlog4j.configurationFile=config/custom-log4j2.properties" -jar data-prepper-core-$VERSION.jar pipelines.yaml data-prepper-config.yaml
```
See the [Log4j 2 configuration documentation](https://logging.apache.org/log4j/2.x/manual/configuration.html) for more information about Log4j 2 configuration.