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File sa_cache.pod of Package sendmailanalyzer
=head1 NAME SendmailAnalyzer Cache Statistic Creator - Sendmail/Postfix log analyzer =head1 DESCRIPTION SendmailAnalyzer collect maillog entries to write datas to flat files, when you run the CGI script sa_report.cgi it had to read each data files for the given period to compute statistics and output HTML reports. This can be enought for day views but when you jump to month view it cost a lot in CPU and memory usage unless you have a home MTA. To speed up things and free system resources you have to run the script sa_cache each night by cron to create cache files. After that viewing a month or year view take less than a second. If you have set per domain report sa_cache will create cache files for each domains. These cache files are name cache.pm for the MTA global statistics and cache.pmYOURDOMAIM.DOM for each domain report. To lowered the memory footprint of the sa_cache program, since version 8.0 it start computing cache file per hours. Since version 4.0 sa_report.cgi will warm you to avoid out of memory when your entering a month view without caching. =head1 USAGE =head2 Huge MTA activity On MTA server with very huge activity you can experience out of memory or wait a very long time before seeing anything in day view. In this case you must run by cron job the perl script sa_cache with the -a option to build cache files for the current day. Statistics will not be shown in realtime but only at the time of the last sa_cache run. You can run it each five minute for example as follow: */5 * * * * /usr/sbin/sa_cache -a or */5 * * * * /usr/sbin/sa_cache --actual-day-only It will only parse data stored in the current day so five minutes interval may be enough for most case. =head2 Archiving When sa_cache is run and following the value of the FREE_SPACE configuration option it will try to archive data older than the current month. If FREE_SPACE is set to 'delete' sa_cache will simply remove the data file from disk. If you set it to 'archive', sa_cache will build a gzipped tarball for all daily data file into the corresponding month directory and the remove date file from disk. If you set it to 'none', data file are kept. If you're primary concerned in disk space saving set it to 'delete'. If you want to preserve data for a year or more you can safely set it to 'archive'. For your information one of my server has 100,000 inbound message a day and a year of 'archive' storage take around 1Gb and a 'delete' storage around 250Mb. =head2 Options sa_cache knows the following options: -c | --config file -d | --date "yyyy/mm" -h | --help -s | --syslog hostname -a | --actual-day-only =over 4 =item B<--config> F<file> Path to sendmailanalyzer configuration file. Default: /etc/sendmailanalyzer.conf =item B<--date> Year/month cache to proceed. Default is all month/year. =item B<--syslog> syslog name of the host to proceed. Default all. =item B<--actual-day-only> Proceed only the current day, this option replace the old and obsolete day_cache script. You still have to run it often like each five minutes. =back =head1 AUTHOR Gilles Darold <gilles @nospam@ darold.net> =head1 COPYRIGHT Copyright (c) 2002-2012 Gilles Darold - All rights reserved. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see < http://www.gnu.org/licenses/ >. =head1 BUGS Your volontee to help construct a better software by submitting bug report or feature request as well as code contribution are welcome. =head1 ACKNOWLEDGEMENT Thank to Sendmail.org for the kind permission to use the "Bat" logo. =cut
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