Hi all,
I'm writing an application where I want to log to a Syslog server. I'm doing it
using a FailoverAppender, so when the Syslog server is down I can log to a
local file. I'm using Log4j 2.0beta4.
Here is my log4j2.xml configuration file:
<configuration>
<appenders>
<RollingFile name="RollingFile" fileName="logs/app.log"
filePattern="logs/archive/app_%d{yyyy-MM-dd}.log" immediateFlush="true"
suppressExceptions="false">
<PatternLayout>
<pattern>%d %-5p - %m%n</pattern>
</PatternLayout>
<Policies>
<TimeBasedTriggeringPolicy />
</Policies>
</RollingFile>
<Syslog name="Syslog_local0" host="16.63.165.60" port="514"
protocol="TCP" appName="LogTester" immediateFlush="true" facility="LOCAL0"
newLine="true" reconnectionDelay="1" suppressExceptions="false"/>
<Failover name="Failover" primary="Syslog_local0" retryInterval="3"
suppressExceptions="false">
<Failovers>
<appender-ref ref="RollingFile"/>
</Failovers>
</Failover>
</appenders>
<loggers>
<root level="debug">
<appender-ref ref="Failover"/>
</root>
</loggers>
</configuration>
Now, I tried some scenarios:
Syslog server is up when my application starts and it remains up till the end:
I can log to Syslog without problems ;-)
Syslog server is down when my application starts and it remains always down: I
don't log to Syslog, but I log to my local file, as expected ;-)
Syslog server is up when my application starts, than it goes down - for example
I log message1 to Syslog, than I put the server down and I log message2 and
message3: in this case I can log message1 to Syslog and when my application
tries to log message2 I get an Exception: ERROR StatusLogger Unable to write to
stream TCP:16.63.165.60:514 for appender Syslog_local0
ERROR StatusLogger An exception occurred processing Appender Syslog_local0
org.apache.logging.log4j.core.appender.AppenderRuntimeException: Error writing
to TCP:16.63.165.60:514
at
org.apache.logging.log4j.core.net.TCPSocketManager.write(TCPSocketManager.java:120)
at
org.apache.logging.log4j.core.appender.OutputStreamManager.write(OutputStreamManager.java:127)
at
org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:115)
at
org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:102)
at
org.apache.logging.log4j.core.appender.FailoverAppender.callAppender(FailoverAppender.java:122)
at
org.apache.logging.log4j.core.appender.FailoverAppender.append(FailoverAppender.java:109)
at
org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:102)
at
org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:335)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:316)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:281)
at org.apache.logging.log4j.core.Logger.log(Logger.java:108)
at org.apache.logging.log4j.spi.AbstractLogger.info(AbstractLogger.java:657)
at com.hp.prp.util.log.SyslogLogger.info(SyslogLogger.java:82)
at com.hp.prp.util.log.Prova.main(Prova.java:25)
Caused by: java.net.SocketException: Software caused connection abort: socket
write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at
org.apache.logging.log4j.core.net.TCPSocketManager.write(TCPSocketManager.java:111)
... 13 more
message2 is lost and message3 is logged to the local file.... So why message2
becomes lost?? How can I do to log it to the local file as I expect?
4. Syslog server is down when my application starts, than it goes up - for
example I log message1 to the local file, than I put the server up and I log
message2 and message3 to Syslog: in this case logging works fine because
fileoverAppender tries the primary appender every 3 seconds.
How can I do to resolve my problems in scenario 3?
Thanks in advance,
Daniele
