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https://issues.apache.org/jira/browse/LOG4J2-398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13764886#comment-13764886
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Ralph Goers commented on LOG4J2-398:
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1. I just want to verify that you know that with the rolling file appenders the
fileName applies to the file that is "active". It is continually written to and
when a rollover occurs that file is renamed or moved to a file matching the
file pattern. At that point the "active" file is deleted and recreated or
similar.
2. If you want the "active" file to contain a timestamp then use the fileName I
mentioned above with only a single '$' character -
fileName="log/$\{date:yyyyMMdd-HHmmss} - myApp.log"
> DateLookup not parsed for FastRollingFile appender
> --------------------------------------------------
>
> Key: LOG4J2-398
> URL: https://issues.apache.org/jira/browse/LOG4J2-398
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.0-beta8
> Environment: Operating System: Windows Server 2008 R2 SP1
> Java Runtime: 1.7.0_03-x64
> Reporter: Jesse Docken
>
> I'm trying to create a Log4j2 configuration file that will create a log file
> using DateLookup so that the current date and time are in the filename (so it
> matches the logging used in our other products). This is what the appender
> configuration looks like:
> {code:borderStyle=solid|language=XML}
> <FastRollingFile name="Rolling" fileName="log/$${date:yyyyMMdd-HHmmss} -
> myApp.log" filePattern="log/$${date:yyyyMMdd-HHmmss} - myApp-%i.log">
> <immediateFlush>true</immediateFlush>
> <suppressExceptions>false</suppressExceptions>
> <PatternLayout>
> <pattern>%d %p %c{1.} [%t] $${env:USER} %m%n</pattern>
> </PatternLayout>
> <Policies>
> <OnStartupTriggeringPolicy />
> <SizeBasedTriggeringPolicy size="100 MB"/>
> </Policies>
> </FastRollingFile>
> {code}
> However when the log file is generated the filename is "${date". I've tried
> different variations and haven't been able to get this lookup to work at all.
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