Thanks.
I found it.

On Tue, Jul 6, 2010 at 8:28 PM, brianmercer <nginx-forum@nginx.us> wrote:

> Xin Liu Wrote:
> -------------------------------------------------------
> > Hi all,
> >
> > My server is Debian. And I installed nginx
> > (0.7.67-1) to host my webpage.
> > The problem is that, everyday on 06:25PM (New York
> > time), nginx will
> > generate a new log file and rename the old log
> > file nginx.log.1.
> > I've checked server, there is no schedule job. And
> > nobody restart nginx or
> > force nginx to generate a new log.
> > Anyone can help?
>
> That does sound like the default behavior of Debian for cron and
> logrotate. Check /etc/crontab for the 6:25AM entry:
>
> 25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts
> --report /etc/cron.daily )
>
> and check for /etc/cron.daily/logrotate and /etc/logrotate.d/nginx.
>
> Posted at Nginx Forum:
> http://forum.nginx.org/read.php?2,105720,105875#msg-105875
>
>
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