:plugin: gelf
:type: input

///////////////////////////////////////////
START - GENERATED VARIABLES, DO NOT EDIT!
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:version: %VERSION%
:release_date: %RELEASE_DATE%
:changelog_url: %CHANGELOG_URL%
:include_path: ../../../../logstash/docs/include
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END - GENERATED VARIABLES, DO NOT EDIT!
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[id="plugins-{type}-{plugin}"]

=== Gelf input plugin

include::{include_path}/plugin_header.asciidoc[]

==== Description

This input will read GELF messages as events over the network,
making it a good choice if you already use Graylog2 today.

The main use case for this input is to leverage existing GELF
logging libraries such as the GELF log4j appender. A library used
by this plugin has a bug which prevents it parsing uncompressed data.
If you use the log4j appender you need to configure it like this to force
gzip even for small messages:

  <Socket name="logstash" protocol="udp" host="logstash.example.com" port="5001">
     <GelfLayout compressionType="GZIP" compressionThreshold="1" />
  </Socket>



[id="plugins-{type}s-{plugin}-options"]
==== Gelf Input Configuration Options

This plugin supports the following configuration options plus the <<plugins-{type}s-{plugin}-common-options>> described later.

[cols="<,<,<",options="header",]
|=======================================================================
|Setting |Input type|Required
| <<plugins-{type}s-{plugin}-host>> |<<string,string>>|No
| <<plugins-{type}s-{plugin}-port>> |<<number,number>>|No
| <<plugins-{type}s-{plugin}-remap>> |<<boolean,boolean>>|No
| <<plugins-{type}s-{plugin}-strip_leading_underscore>> |<<boolean,boolean>>|No
|=======================================================================

Also see <<plugins-{type}s-{plugin}-common-options>> for a list of options supported by all
input plugins.

&nbsp;

[id="plugins-{type}s-{plugin}-host"]
===== `host` 

  * Value type is <<string,string>>
  * Default value is `"0.0.0.0"`

The IP address or hostname to listen on.

[id="plugins-{type}s-{plugin}-port"]
===== `port` 

  * Value type is <<number,number>>
  * Default value is `12201`

The port to listen on. Remember that ports less than 1024 (privileged
ports) may require root to use.

[id="plugins-{type}s-{plugin}-remap"]
===== `remap` 

  * Value type is <<boolean,boolean>>
  * Default value is `true`

Whether or not to remap the GELF message fields to Logstash event fields or
leave them intact.

Remapping converts the following GELF fields to Logstash equivalents:

* `full\_message` becomes `event.get("message")`.
* if there is no `full\_message`, `short\_message` becomes `event.get("message")`.

[id="plugins-{type}s-{plugin}-strip_leading_underscore"]
===== `strip_leading_underscore` 

  * Value type is <<boolean,boolean>>
  * Default value is `true`

Whether or not to remove the leading `\_` in GELF fields or leave them
in place. (Logstash < 1.2 did not remove them by default.). Note that
GELF version 1.1 format now requires all non-standard fields to be added
as an "additional" field, beginning with an underscore.

e.g. `\_foo` becomes `foo`




[id="plugins-{type}s-{plugin}-common-options"]
include::{include_path}/{type}.asciidoc[]