[CentOS] Log rolling with a daemon

Sun Dec 22 02:46:42 UTC 2013
Cliff Pratt <enkiduonthenet at gmail.com>

John's suggestion is still pertinent. You'll need a SIGHUP handler in your
script. Logrotate could send the SIGHUP in a postrotate 'script'.



On Sun, Dec 22, 2013 at 3:15 PM, Larry Martell <larry.martell at gmail.com>wrote:

> On Sat, Dec 21, 2013 at 8:52 PM, John R Pierce <pierce at hogranch.com>
> wrote:
> > On 12/21/2013 4:56 PM, Larry Martell wrote:
> >> I'm looking for advice or suggestions for rolling log files with a
> >> daemon. I have a python script that I daemonized with
> >>
> http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/
> .
> >> Before I daemonized it it was run from a bash script that invoked the
> >> underlying python script. It ran the python script, waited for it to
> >> complete and then it slept for 5 seconds and ran it again. This was in
> >> a infinite loop. In between each invocation it checked the log file
> >> and if it was over 10MB it renamed it and then the next invocation
> >> started with a new empty log. Since each invocation was a separate run
> >> this worked fine.  But now the daemonized python script doesn't exit -
> >> the same log file is attached to it forever. So my renaming of the
> >> file does nothing - the i node doesn't change and it's still logging
> >> to the same large file. Anyone have any ideas how I can achieve this
> >> sort of log rolling in this situation?
> >>
> >
> > send a SIGHUP to syslog  and it shoudl re-opent he log files.
> >
> > silly question, but whats wrong with the logrotate daemon thats built
> > into centos?
> This is not using syslog. If you look at the daemonizing script I gave
> the link to, you pass in the log files for stdout and stderr, and it
> does some double fork magic and then associates the given files with
> them.
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