log4j2.xml example for logstash-gelf usage

log4j2.xml

<Configuration status="TRACE" monitorInterval="180">
	...
   <!--CHANGE HOST AND PORT PROPERTIES ACCORDING TO YOUR NEEDS-->
   <Appenders>
      <Gelf name="gelf" host="udp:graylog.somedomain.com" port="12211" version="1.1" extractStackTrace="true" filterStackTrace="true" mdcProfiling="true" includeFullMdc="true" maximumMessageSize="8192" originHost="%host{fqdn}">
         <!--THESE FIELD DEFINITIONS ARE NOT MANDATORY, YOU CAN USE DEFAULTS-->
         <Field name="timestamp" pattern="%d{dd MMM yyyy HH:mm:ss,SSS}"/>
         <Field name="level" pattern="%level"/>
         <Field name="simpleClassName" pattern="%C{1}"/>
         <Field name="className" pattern="%C"/>
         <Field name="server" pattern="%host"/>
         <Field name="server.fqdn" pattern="%host{fqdn}"/>
         <!--THESE ARE MY CUSTOM GRAYLOG FIELDS-->
         <Field name="logStream" literal="MYAWESOMEAPPS"/>
         <Field name="projectName" literal="AWESOMEPROJECT"/>
      </Gelf>
   </Appenders>
   <Loggers>
      <Root level="INFO" additivity="false" includeLocation="true">
	 ...
         <AppenderRef ref="RollingFile"/>
         <AppenderRef ref="gelf"/>
      </Root>
   </Loggers>
</Configuration>