<!--RemoteSyslogAppender-->
<appender name="remoteSyslogAppender" type="log4net.Appender.RemoteSyslogAppender">
      <facility value="local0" />
      <identity value="%date{yyyy-MM-ddTHH:mm:ss.ffffffzzz} %P{log4net:HostName} 填寫系統縮寫（雙引號前請保留一個空格） " />
      <RemoteAddress value="rsyslog-ip" />
      <RemotePort value="rsyslog-port" />
      <Encoding value ="UTF-8" />
      <layout type="log4net.Layout.PatternLayout" value="%d [%-5p] [%t] - %m%n"/>
</appender>

<!--ref appender to logger 以下僅供參考 appender-ref可以多個-->
 <logger name="ERRORlogger" additivity="false">
     <level value="ERROR"/>
     <appender-ref ref="remoteSyslogAppender"/>
 </logger>

#appender rsyslog
log4j.appender.rsyslog=org.apache.log4j.net.SyslogAppender
log4j.appender.rsyslog.syslogHost=rsyslog-ip
log4j.appender.rsyslog.Facility=local1
log4j.appender.rsyslog.FacilityPrinting=true
log4j.appender.rsyslog.header=true
log4j.appender.rsyslog.layout=org.apache.log4j.PatternLayout
log4j.appender.rsyslog.layout.conversionPattern=%d [%-5p] [%t] - %m%n