zookeeper-003-源码阅读之日志输出配置 log4j

启动debug 调试zookeeper项目 ,console 管理控制台将会输出如下警告信息。

log4j:WARN No appenders could be found for logger (org.apache.log4j.jmx.HierarchyDynamicMBean).
log4j:WARN Please initialize the log4j system properly.

为了输出日志方便往后的跟踪调试，但愿可使用log4j将日志输出到管理控制台和日志文件中。

在源代码conf 目录下 ，项目自带有 log4j.properties 文件

program arguments使用 zookeeper 默认配置文件进行启动

E:\zk\zookeeper-3.3.6\conf\zoo_sample.cfg

eclipse vm arguments 指定 使用log4j

-Dzookeeper.log.dir=file:/E:/zk/log
-Dzookeeper.root.logger=DEBUG,CONSOLE,ROLLINGFILE
-Dlog4j.configuration=file:/E:/zk/zookeeper-3.3.6/conf/log4j.properties

其中滚动日志的输出目录能够经过 log4j.appender.ROLLINGFILE.File=E:/zk/log/zookeeper.log 来配置，

再运行调试，eclipse 管理控制台将不在打印警告，在 E:/zk/log 目录能够找到咱们要的 zookeeper.log 日志文件。

#
# ZooKeeper Logging Configuration
#

# Format is "<default threshold> (, <appender>)+

# DEFAULT: console appender only
log4j.rootLogger=DEBUG, CONSOLE, ROLLINGFILE

# Example with rolling log file
#log4j.rootLogger=DEBUG, CONSOLE, ROLLINGFILE

# Example with rolling log file and tracing
#log4j.rootLogger=TRACE, CONSOLE, ROLLINGFILE, TRACEFILE

#
# Log INFO level and above messages to the console
#
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Threshold=INFO
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} - %-5p [%t:%C{1}@%L] - %m%n

#
# Add ROLLINGFILE to rootLogger to get log file output
#    Log DEBUG level and above messages to a log file
log4j.appender.ROLLINGFILE=org.apache.log4j.RollingFileAppender
log4j.appender.ROLLINGFILE.Threshold=DEBUG
log4j.appender.ROLLINGFILE.File=E:/zk/log/zookeeper.log

# Max log file size of 10MB
log4j.appender.ROLLINGFILE.MaxFileSize=10MB
# uncomment the next line to limit number of backup files
#log4j.appender.ROLLINGFILE.MaxBackupIndex=10

log4j.appender.ROLLINGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.ROLLINGFILE.layout.ConversionPattern=%d{ISO8601} - %-5p [%t:%C{1}@%L] - %m%n


#
# Add TRACEFILE to rootLogger to get log file output
#    Log DEBUG level and above messages to a log file
log4j.appender.TRACEFILE=org.apache.log4j.FileAppender
log4j.appender.TRACEFILE.Threshold=TRACE
log4j.appender.TRACEFILE.File=zookeeper_trace.log

log4j.appender.TRACEFILE.layout=org.apache.log4j.PatternLayout
### Notice we are including log4j's NDC here (%x)
log4j.appender.TRACEFILE.layout.ConversionPattern=%d{ISO8601} - %-5p [%t:%C{1}@%L][%x] - %m%n

参考文档：

http://fanrey.iteye.com/blog/1683137

http://www.tuicool.com/articles/2MJf6j

http://my.oschina.net/pingpangkuangmo/blog?catalog=3305102