Hello Pascale,
I think generating the one-file-per-server-IP can be achieved through Joran's
replay capability. However, that's a relatively sophisticated and ill-documented
technique.
At this time, I suggest that you either enter a bug report asking for this
feature or implement it on your own by adapting currently existing code.
Best regards,
Pascale, Peter H. wrote:
You could separate the log statements as a post-processing step
(generating the one-file-per-server-IP - say on a daily basis). We do
something like that, but in our case the aggregate log file has a value
by itself.
Peter
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Stefan Armbruster
Sent: Sunday, February 17, 2008 1:29 PM
To: logback users list
Subject: Re: [logback-user] using different appenders based on MDC value
Assume a clustered webapp distributed to multiple servers running tomcat
(e.g.
app1, app2, app3). Since appX are diskless servers, the webapp's
logback.xml
simply uses SocketAppender to redirect all log messagess to a central
logging
server.
The webapp uses a servlet filter (similar to
http://logback.qos.ch/manual/mdc.html) to populate the MDC with the
server's
IP number.
The central logging server receives all log messages from app1-appX
using
SimpleSocketServer and writes them to a single file using the following
config:
<appender name="default"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>default.log</file>
<rollingPolicy
class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<FileNamePattern>default-%d{yyyy-MM-dd}.log</FileNamePattern>
</rollingPolicy>
<layout class="ch.qos.logback.classic.PatternLayout">
<Pattern>%d{ISO8601} [%thread] S:%X{server} %-5level
%logger{36} - %msg%n</Pattern>
</layout>
</appender>
Note that the server's IP appears inside the logfile, nothing new until
now.
The goal is to have multiple logfiles ( 1 per server IP number), e.g.
default_192.168.0.1.log
default_192.168.0.2.log
...
default_192.168.0.n.log
So the appender must be aware of the server's ip number stored in the
MDC map.
I hope this spreads some more light on my use case.
Regards,
Stefan
Am Sonntag, 17. Februar 2008 schrieb Ceki Gulcu:
Stefan,
Could you please expand on the use case?
Stefan Armbruster wrote:
Hi,
is there a way to redirect log messages depending on a MDC variable
to
different appenders? The logback manual only uses MDC values for the
pattern inside a single appender.
Example: assume, the code sets a MDC variable "context". If a log
message
is supplied with context="A", it should be written to
application_A.log,
if it has context="B", the message should be written to
application_B.log, and so on.
If this is not possible by default, it should be possible to write a
kind
of MDCAwareAppenderWrapper like this (only pseudo code below):
public class MDCAwareAppenderWrapper<E> implements Appender<E> {
Map<String,Appender> appenderMap;
String mdcName;
... setters and getters omitted
public void doAppend(E event) {
LoggingEvent le = (LoggingEvent)event;
String mdcValue = le.getMDCPropertyMap().get(mdcName);
Appender appender = appenderMap.get(mdcValue);
appender.doAppend(event);
}
}
MDCAwareAppenderWrapper is configured by a Map<String,Appender> that
maps
MDC values (A and B from the example above) to the real appenders.
Any hints or comments on that?
Kind regards,
Stefan
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