Quick question about using kill -USR1 to recreate access.log

Alder Netw aldernetwork at gmail.com
Wed Sep 27 20:17:35 UTC 2017

Hi Maxim,

We came across a case where kill -USR1 doesn't cause nginx reopen the
access.log. And we need to run nginx with "daemon off" and "master-process
off". Is that a known issue and is there any workaround?

On Tue, May 20, 2014 at 4:33 AM, Maxim Dounin <mdounin at mdounin.ru> wrote:

> Hello!
> On Mon, May 19, 2014 at 03:06:06PM -0400, samingrassia wrote:
> > Thanks to everyone in advance!
> >
> > I have a cron that runs the following:
> >
> > kill -USR1 `cat $NGINX_PID`
> >
> > My questions is during time between the mv and the kill, is there any log
> > writes that are being discarded or are they being stacked in memory and
> > dumped into the new access.log after it is recreated?
> Unless you are trying to move logs to a different filesystem,
> logging will continue to the old file till USR1 is processed.
> From nginx point of view, the "mv" command does nothing - as nginx
> has open file descriptor, it will continue to write to it, and log
> lines will appear in the (old) file - the file which is now have a
> new name.  After USR1 nginx will reopen the log, and will continue
> further logging to a new file.
> --
> Maxim Dounin
> http://nginx.org/
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