06-19-2007
Assuming that the author of the code writing the never-ending file knows even a little bit about unix:
1. For this process there is a configuration file, which names the output logfile.
2. The process "reconfigures" itself when it receives a SIGHUP signal,
by re-reading the config file, and if the name of the logfile changed, then close the old one, open the new one.
This is pretty much UNIX standard for a never-ending log writer program.
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LEARN ABOUT DEBIAN
penlogd
PENLOGD(1) General Commands Manual PENLOGD(1)
NAME
penlogd - consolidate web server logs
SYNOPSIS
penlogd [-fd] [-j dir] [-l logfile] [-n N] [-p pidfile] [-u user] port
EXAMPLE
penlogd -l /var/log/access_log -p /var/run/penlogd.pid 10000
DESCRIPTION
Penlogd receives log entries from Pen and from each of the web servers. It consolidates the entries by replacing the source addresses in
each entry with the "real" client address and writes the result to stdout or to the file given on the command line. This completely
removes the need for postprocessing with mergelogs, since the logs are already merged.
Pen must be instructed to send its log to penlogd. See HOWTO and pen man page for details.
Sending penlogd a HUP signal will make it close and reopen the logfile, unless it is logging to stdout. Rotate the log like this:
mv access_log access_log.1 kill -HUP `cat <pidfile>`
where <pidfile> is the file containing pen's process id.
Sending penlogd a TERM signal will make it close the log file and exit cleanly.
OPTIONS
-d Turn on debugging. The output goes to stderr if we are running in the foreground (see -f) and to syslog (facility user, priority
debug) otherwise.
-f Stay in foreground.
-j dir Run in a chroot environment.
-l logfile
Write output into logfile.
-n N Number of pen log entries to cache (default 1000).
-p pidfile
Write process id into pidfile.
-u user
Run as a different user.
port The UDP port where penlogd receives log entries.
SEE ALSO
pen(1), penlog(1), webresolve(1)
AUTHOR
Copyright (C) 2002-2003 Ulric Eriksson, <ulric@siag.nu>.
LOCAL PENLOGD(1)