[CentOS] Log rolling with a daemon

Larry Martell larry.martell at gmail.com
Sun Dec 22 02:15:53 UTC 2013

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

More information about the CentOS mailing list