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Wolfgang Knauf commented on LOG4NET-465: ---------------------------------------- Is this still relevant in 2.0.15 and .NET6? I found this issue when researching a similar issue. But for me, it turned out to be a problem in my log4net config file. After changing the config, the rolling log files are kept after an app restart. So I hope it was fixed in the meantime. For the records: in my problematic config i had defined the file extension as part of the date pattern (found this hint somewhere in the web years ago) - but it caused problems with size rolling log files: {quote} <appender name="InformationAppender" type="log4net.Appender.RollingFileAppender"> <file value="logfile_" /> <appendToFile value="true" /> <rollingStyle value="Composite" /> <maximumFileSize value="50MB"/> <maxSizeRollBackups value="10"/> <preserveLogFileNameExtension value="true"/> <staticLogFileName value="false" /> <datePattern value="{color:#de350b}yyyy-MM'.log'{color}" /> </appender> {quote} And this is the working config (thanks to the creator of this bug anyway, as it pointed me in the right direction): {quote} <appender name="InformationAppender" type="log4net.Appender.RollingFileAppender"> <file value="logfile_.log" /> <appendToFile value="true" /> <rollingStyle value="Composite" /> <maximumFileSize value="50MB"/> <maxSizeRollBackups value="10"/> <preserveLogFileNameExtension value="true"/> <staticLogFileName value="false" /> <datePattern value="yyyy-MM" /> </appender> {quote} My only difference to the config file from the initial bugreport: I use the default "CountDirection". > Rolling log files get overwritten when IIS is restarted > ------------------------------------------------------- > > Key: LOG4NET-465 > URL: https://issues.apache.org/jira/browse/LOG4NET-465 > Project: Log4net > Issue Type: Bug > Components: Appenders > Affects Versions: 1.2.13 > Environment: asp.net 4.0 > Reporter: Michel Emond > Priority: Major > Attachments: RollingFileAppender.diff, config.xml > > > This is the issue described in LOG4NET-378 > h2. Reproduction steps > # Setup a web application using the settings from the attached config.xml file > # Notice the rolling style set to Composite > # Start and use the application > # The log files pile up in the folder > # Restart IIS > # Keep using the application > Expected result > - The rolling continues on or after the last file > Actual result > - The rolling restarts at index 1 and overwrites the existing files > h2. Solution > See the attached files: > - config.xml > - patch with a fix proposal > The original bug fix addresses the issue in the InitializeFromOneFile() > method. > However, the GetWildcardPatternForFile() method also needs the baseFileName > to be adjusted with the datePattern so the proper files are searched. > I placed a file path fix in the DetermineCurSizeRollBackups() method, so it's > then passed down to the two other methods and everyone gets happy. > Here's a calling stack sample: > {code} > DetermineCurSizeRollBackups() > | > +--GetExistingFiles() > | +--GetWildcardPatternForFile() > | > +--InitializeRollBackups() > +--InitializeFromOneFile() > {code} -- This message was sent by Atlassian Jira (v8.20.10#820010)