ZeroMQ centralized logging for log4j. ZMQAppender is now a separate project by @lusis
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LogCentric is a Java library for centralized logging built on top of log4j and ZeroMQ.

zmq-appender, a successor of LogCentric by @lusis, is now available at

Usually web apps are running on several machines and logs are stored in each of them. Digging into logs here and there are not just a pain but an obstacle to understanding the whole story of the system. So keeping the whole logs at one place is a nice idea.

LogCentric consists of 2 parts: ZMQAppender and LogCollector.

ZMQAppender is a log4j appender that broadcasts logging events over ZeroMQ. LogCollector catches the logging events and generates a centralized log in a manner of usual apps that use log4j.


ZMQAppender can be configured in log4j.xml.

<appender name="logcentric" class="com.y1ban.logcentric.publisher.ZMQAppender">
	<param name="threads" value="1" />
	<param name="endpoint" value="tcp://*:5555" />
	<param name="blocking" value="true" />


LogCentric jar is an executable jar to run LogCollector.

java -Dlogcentric.threads=1 -Dlogcentric.endpoint=tcp://localhost:5555 -Dlogcentric.blocking=true -jar logcentric-<VERSION>.jar


Copyright 2012 ICHIBANGASE, Yutaka

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

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