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mnoGoSearch 3.3.12 reference manual: Full-featured search engine software
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Using syslog

mnoGoSearch programs indexer and search.cgi can use syslog to log its messages. Different verbose levels can be specified using the -v option in indexer command line, as well as with help of the LogLevel command in indexer.conf and search.cgi

Table 3-1. Verbose levels

0SILENTsuppress all logs. Default for search.cgi
1ERRORlog only critical errors
2WARNINGlog warnings as well
3INFOadd info messages to log. Default for indexer.
4EXTRAextra logging
5DEBUGfor debug purposes

By default, log messages are sent both to syslog and to STDOUT/STDERR. You can use the -l command line option to suppress logging to STDOUT/STDERR. This can be useful when you run indexer from cron.

Note: You can compile mnoGoSearch without syslog support. In order to do it, run configure --disable-syslog, then rebuild mnoGoSearch. When compiled without syslog support, mnoGoSearch can only use STDOUT/STDERR for logging.

syslog uses different facilities to separate log messages. mnoGoSearch uses the LOCAL7 facility by default. Facility be changed when running configure with the --enable-syslog=LOG_FACILITY option, where LOG_FACILITY is one of the standard facilities, usually listed in /usr/include/sys/syslog.h header file.

Facility helps to separate mnoGoSearch messages from others. You can modify /etc/syslog.conf to tell syslog how to handle mnoGoSearch messages. For example:

# Log all messages from mnoGoSearch to a separate file
local7.*        -/var/log/mnoGoSearch.log

Another example:

# Send all mnoGoSearch messages to the host "central"
# Syslog on central should be configured to accept the messages
local7.*        @central

By default all messages are also logged to the file /var/log/messages. If you use mnoGoSearch actively, it can flood this file with a huge number of messages. To avoid this you can add local7.none or local7.!* (ignore any messages from the local7 facility) to your "catch-all" log files.

For example:

# Some `catch-all' logfiles.
        local7.!*               -/var/log/messages

Please take a look at syslogd(8) and syslog.conf(5) man pages for more information about syslog and its configuration notes.