SDL Tridion 2013 SP1 Content Delivery Logback configuration example from installation media. This is the part of the logback.xml which you would effectively use on a presentation server. The following loggers are removed from this example: rollingTransportLog, rollingDeployerLog, rollingMonitorLog, rollingSessionPreviewLog
<appender name="rollingContextLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${log.folder}/cd_context.%d{yyyy-MM-dd}.log</fileNamePattern>
<maxHistory>${log.history}</maxHistory>
</rollingPolicy>
<encoder>
<charset>${log.encoding}</charset>
<pattern>${log.pattern}</pattern>
</encoder>
<prudent>true</prudent>
</appender>
...
<appender name="rollingCoreLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${log.folder}/cd_core.%d{yyyy-MM-dd}.log</fileNamePattern>
<maxHistory>${log.history}</maxHistory>
</rollingPolicy>
<encoder>
<charset>${log.encoding}</charset>
<pattern>${log.pattern}</pattern>
</encoder>
<prudent>true</prudent>
</appender>
...
<logger name="com.tridion" level="${log.level}"/>
<logger name="com.sdl.context" level="${log.level}">
<appender-ref ref="rollingContextLog"/>
</logger>
<logger name="Tridion.ContentDelivery" level="${log.level}">
<appender-ref ref="rollingCoreLog"/>
</logger>
<root level="OFF">
<appender-ref ref="rollingCoreLog"/>
</root>