druid/examples/conf/zk/log4j2.xml

<?xml version="1.0" encoding="UTF-8" ?>
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 ~ to you under the Apache License, Version 2.0 (the
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<Configuration status="WARN">
<Properties>
  <!-- to change log directory, set DRUID_LOG_DIR environment variable to your directory before launching Druid -->
  <Property name="druid.log.path" value="log" />
</Properties>

<Appenders>
  <Console name="Console" target="SYSTEM_OUT">
    <PatternLayout pattern="%d{ISO8601} %p [%t] %c - %m%n"/>
  </Console>

  <!-- Rolling Files-->
  <RollingRandomAccessFile name="FileAppender"
                           fileName="${sys:druid.log.path}/zookeeper.log"
                           filePattern="${sys:druid.log.path}/zookeeper.%d{yyyyMMdd}.log">
    <PatternLayout pattern="%d{ISO8601} %p [%t] %c - %m%n"/>
    <Policies>
      <TimeBasedTriggeringPolicy interval="1" modulate="true"/>
    </Policies>
    <DefaultRolloverStrategy>
      <Delete basePath="${sys:druid.log.path}/" maxDepth="1">
        <IfFileName glob="*.log" />
        <IfLastModified age="7d" />
      </Delete>
    </DefaultRolloverStrategy>
  </RollingRandomAccessFile>

</Appenders>

<Loggers>
  <Root level="info">
    <AppenderRef ref="FileAppender"/>
  </Root>
</Loggers>
</Configuration>