DataparkSearch Engine 4.50: Reference manual
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# 3.12. Using syslog

DataparkSearch indexer uses syslog to log its messages. Different verbose levels could be specified with -v option or by LogLevel command in config files:

Table 3-1. Verbose levels

0 | SILENT | suppress all log. Bad idea, better use -l option.
1 | ERROR | log only critical errors
2 | WARNING | log warnings as well
3 | INFO | add info messages to log. Default.
4 | EXTRA | extra logging
5 | DEBUG | for debug purposes

You may use -l option to suppress log to stdout/stderr when running indexer via crontab. Without -l option log is sent both to stdout/stderr and to log files. If you do not like such behavior, run configure with `--disable-syslog` flag and recompile indexer. Compiled without syslog support, indexer uses only stdout/stderr.

Syslog uses different facilities to separate log messages. The indexer's default facility is LOCAL7. Facility could be changed during configure with `--enable-syslog=LOG_FACILITY` option. LOG_FACILITY should be one of the standard facilities, usually listed in `/usr/include/sys/syslog.h` header file.

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

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

Other example:

    # Send all DataparkSearch messages to host named central
    # Syslog on central should be configured to allow this
    local7.*        @central

By default all messages are logged to `/var/log/messages` as well. DataparkSearch could populate this file with a number of messages. To avoid this, add local7.none or local7.!* (ignore any messages from local7 facility) to your 'catch-all' log files.

For example:

    #
    # Some `catch-all' logfiles.
    #
    *.=info;*.=notice;*.=warn;\
            auth,authpriv.none;\
            cron,daemon.none;\
            mail,news.none;\
            local7.!*               -/var/log/messages

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

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