将JsonLayout与SOLR日志一起使用

Question

我正在尝试使用JSONLayout以JSON格式记录SOLR的所有事件。我正在使用SOLR的官方docker镜像，但无法正常工作。这是我的设置：

Dockerfile

FROM solr:7
COPY log4j2-json.xml /opt/solr/server/resources/log4j2.xml

USER root
RUN chmod 644 /opt/solr/server/resources/log4j2.xml
RUN chown solr:solr /opt/solr/server/resources/log4j2.xml

USER solr
EXPOSE 8983
CMD ["solr-precreate", "gettingstarted"]

log4j2.xml原始文件（不包含JsonLayout），该文件确实创建了solr.log文件（使用PatternLayout）：

<?xml version="1.0" encoding="UTF-8"?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You 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

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  -->

<Configuration>
  <Appenders>

    <Console name="STDOUT" target="SYSTEM_OUT">
      <PatternLayout>
        <Pattern>
          %d{yyyy-MM-dd HH:mm:ss.SSS} %-5p (%t) [%X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
        </Pattern>
      </PatternLayout>
    </Console>

    <RollingFile
        name="RollingFile"
        fileName="${sys:solr.log.dir}/solr.log"
        filePattern="${sys:solr.log.dir}/solr.log.%i" >
      <PatternLayout>
        <Pattern>
          %d{yyyy-MM-dd HH:mm:ss.SSS} %-5p (%t) [%X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
        </Pattern>
      </PatternLayout>
      <Policies>
        <OnStartupTriggeringPolicy />
        <SizeBasedTriggeringPolicy size="32 MB"/>
      </Policies>
      <DefaultRolloverStrategy max="10"/>
    </RollingFile>

    <RollingFile
        name="SlowFile"
        fileName="${sys:solr.log.dir}/solr_slow_requests.log"
        filePattern="${sys:solr.log.dir}/solr_slow_requests.log.%i" >
      <PatternLayout>
        <Pattern>
          %d{yyyy-MM-dd HH:mm:ss.SSS} %-5p (%t) [%X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
        </Pattern>
      </PatternLayout>
      <Policies>
        <OnStartupTriggeringPolicy />
        <SizeBasedTriggeringPolicy size="32 MB"/>
      </Policies>
      <DefaultRolloverStrategy max="10"/>
    </RollingFile>

  </Appenders>
  <Loggers>
    <Logger name="org.apache.hadoop" level="warn"/>
    <Logger name="org.apache.solr.update.LoggingInfoStream" level="off"/>
    <Logger name="org.apache.zookeeper" level="warn"/>
    <Logger name="org.apache.solr.core.SolrCore.SlowRequest" level="info" additivity="false">
      <AppenderRef ref="SlowFile"/>
    </Logger>

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

log4j2.xml，在RollingFile附加程序中带有JsonLayout可以将其中断。没有创建solr.log文件：

<?xml version="1.0" encoding="UTF-8"?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You 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

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  -->

<Configuration>
  <Appenders>

    <Console name="STDOUT" target="SYSTEM_OUT">
      <PatternLayout>
        <Pattern>
          %d{yyyy-MM-dd HH:mm:ss.SSS} %-5p (%t) [%X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
        </Pattern>
      </PatternLayout>
    </Console>

    <RollingFile
        name="RollingFile"
        fileName="${sys:solr.log.dir}/solr.log"
        filePattern="${sys:solr.log.dir}/solr.log.%i" >
      <JsonLayout complete="false" compact="true" eventEol="true" />
      <Policies>
        <OnStartupTriggeringPolicy />
        <SizeBasedTriggeringPolicy size="32 MB"/>
      </Policies>
      <DefaultRolloverStrategy max="10"/>
    </RollingFile>

    <RollingFile
        name="SlowFile"
        fileName="${sys:solr.log.dir}/solr_slow_requests.log"
        filePattern="${sys:solr.log.dir}/solr_slow_requests.log.%i" >
      <PatternLayout>
        <Pattern>
          %d{yyyy-MM-dd HH:mm:ss.SSS} %-5p (%t) [%X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
        </Pattern>
      </PatternLayout>
      <Policies>
        <OnStartupTriggeringPolicy />
        <SizeBasedTriggeringPolicy size="32 MB"/>
      </Policies>
      <DefaultRolloverStrategy max="10"/>
    </RollingFile>

  </Appenders>
  <Loggers>
    <Logger name="org.apache.hadoop" level="warn"/>
    <Logger name="org.apache.solr.update.LoggingInfoStream" level="off"/>
    <Logger name="org.apache.zookeeper" level="warn"/>
    <Logger name="org.apache.solr.core.SolrCore.SlowRequest" level="info" additivity="false">
      <AppenderRef ref="SlowFile"/>
    </Logger>

    <Root level="debug">
      <AppenderRef ref="RollingFile"/>
      <AppenderRef ref="STDOUT"/>
    </Root>
  </Loggers>
</Configuration>

我希望看到在logdir中创建solr.log文件，并以json格式查看事件。但是，甚至没有创建solr.log文件。但是SOLR不会启动。

我想念什么？

感谢您的帮助。

PS。我发现此线程描述了相同的问题，但没有解决方案：see here