Rolling logback logs on filesize and time

Question

I've been trying to set up a simple logback project to roll my log files by date and by filesize, and so far I have been unable to get my appender to roll over to another file. Instead, it writes to the log specified by the <file/> tag.

Here is my logback.xml configuration file:

<?xml version="1.0"?> <configuration scan="true" scanPeriod="10 seconds">     <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">         <layout class="ch.qos.logback.classic.PatternLayout">             <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>         </layout>     </appender>      <appender name="milliroller" class="ch.qos.logback.core.rolling.RollingFileAppender">         <file>log/output.log</file>         <layout class="ch.qos.logback.classic.PatternLayout">             <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>         </layout>         <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">             <fileNamePattern>log/mylog-%d{yyyy-MM-dd}.%i.txt</fileNamePattern>             <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">                 <maxFileSize>1KB</maxFileSize>             </timeBasedFileNamingAndTriggeringPolicy>         </rollingPolicy>     </appender>      <root level="DEBUG">         <appender-ref ref="stdout"/>         <appender-ref ref="milliroller"/>     </root>      <logger name="com.tkassembled.logback" level="DEBUG"/> </configuration> 

At first glance, it looks like it should work, right? Is there something I'm doing wrong? My entire, buildable project is available in a zip here: http://www.mediafire.com/file/2bxokkdyz2i/logback.zip

Answer 1

Although this is an old question, I felt that a working answer is appropriate to help anyone who requires this kind of implementation.

I use the following logback configuration to provide an HTML log, rolled over by date and filesize, as well as logging to console for debugging output.

Logfiles are stored in a logs directory with a name of logFile.html while its active, and logFile.2013-mm-dd.i.html when it rolls over, where i is the number of 50MB log files. For instance logFile.2013-01-07.0.html.

<configuration>    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">     <!-- encoders are assigned the type          ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->     <encoder>       <charset>UTF-8</charset>       <pattern>%d{HH:mm:ss.SSS} [%thread] %highlight(%-5level) %cyan(%logger{35}) - %msg %n</pattern>     </encoder>   </appender>    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">     <file>logs\logFile.html</file>     <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">       <!-- daily rollover -->       <fileNamePattern>logs\logFile.%d{yyyy-MM-dd}.%i.html</fileNamePattern>       <timeBasedFileNamingAndTriggeringPolicy           class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">           <!-- or whenever the file size reaches 50MB -->         <maxFileSize>50MB</maxFileSize>       </timeBasedFileNamingAndTriggeringPolicy>       <!-- keep 30 days' worth of history -->       <maxHistory>30</maxHistory>     </rollingPolicy>     <encoder class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">       <charset>UTF-8</charset>       <layout class="ch.qos.logback.classic.html.HTMLLayout">         <pattern>%d{HH:mm:ss.SSS}%thread%level%logger%line%msg</pattern>       </layout>              </encoder>   </appender>     <root level="DEBUG">     <appender-ref ref="STDOUT" />     <appender-ref ref="FILE" />        </root>  </configuration> 

Answer 2

Since logback 1.1.7 (released March 2016) a new policy called SizeAndTimeBasedRollingPolicy is available that dramatically simplifies what you need to do:

<appender name="ROLLING" class="ch.qos.logback.core.rolling.RollingFileAppender">     <file>app.log</file>     <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">         <fileNamePattern>app-%d{yyyy-MM-dd}.%i.log</fileNamePattern>         <maxFileSize>10MB</maxFileSize>             <maxHistory>30</maxHistory>         <totalSizeCap>1GB</totalSizeCap>     </rollingPolicy>     <encoder>         <pattern>%msg%n</pattern>     </encoder> </appender> 

See here for further info.