You can have logrotate entries like the following:

# rotate some Logs

/logdirectory/messages {

  weekly

  rotate 12

  compress

  postrotate

    /usr/bin/pkill -HUP syslog

  endscript

}

What this does is simply rotate the log, and then send HUP to Syslog-NG to stop it from writing to the current inode which points to the recently rotated logfile.  This specific configuration will rotate weekly, keeping 12 compressed revisions using GZIP.

I hope this helps,

Justin.

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From: Padmanabhan, Rajeesh (GE Healthcare) [mailto:Rajeesh.Padmanabhan@ge.com]
Sent: Friday, March 09, 2007 6:16 AM
To: Syslog-ng users' and developers' mailing list
Subject: RE: [syslog-ng] Syslog-ng log file overwrite

Basically what i am trying to configure is log rotation of Syslog-ng files.. 

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From: syslog-ng-bounces@lists.balabit.hu [mailto:syslog-ng-bounces@lists.balabit.hu] On Behalf Of Padmanabhan, Rajeesh (GE Healthcare)
Sent: Friday, March 09, 2007 3:52 PM
To: Syslog-ng users' and developers' mailing list
Subject: [syslog-ng] Syslog-ng log file overwrite

Hi Bazsi,

Do syslog-ng overwrites log file by default? If yes, what is the process/strategy done by syslog-ng to overwrite the file?

Thanks,

Rajeesh