syslog-ng Open Source Edition 3.25 - Administration Guide

Using the GeoIP2 parser

parser parser_name {
    geoip2(
        <macro-containing-the-IP-address-to-lookup>
        prefix()
        database("<path-to-geoip2-database-file>")
    );
};

In the following example, syslog-ng OSE retrieves the GeoIP2 data of the IP address contained in the ${HOST} field of the incoming message (assuming that in this case the ${HOST} field contains an IP address), and includes the data (prefixed with the geoip2 string) in the output JSON message.

@version: 3.11
@module geoip2

options {
    keep-hostname(yes);
};

source s_file {
    file("/tmp/input");
};

parser p_geoip2 {
    geoip2(
        "${HOST}",
        prefix( "geoip2." )
        database( "/usr/share/GeoIP2/GeoLiteCity.dat" )
    );
};

destination d_file {
    file(
        "/tmp/output"
        flags(syslog-protocol)
        template("$(format-json --scope core --key geoip2*)\n")
    );
};


log {
    source(s_file);
    parser(p_geoip2);
    destination(d_file);
};

For example, for the <38>2017-05-24T13:09:46 192.168.1.1 prg00000[1234]: test message message the output will look like:

<38>1 2017-05-24T13:09:46+02:00 192.168.1.1 prg00000 1234 - [meta sequenceId="3"] {"geoip2":{"subdivisions":{"0":{"names":{"en":"Budapest"},"iso_code":"BU","geoname_id":"3054638"}},"registered_country":{"names":{"en":"Hungary"},"iso_code":"HU","geoname_id":"719819"},"postal":{"code":"1063"},"location":{"time_zone":"Europe/Budapest","longitude":"19.070200","latitude":"47.510200","accuracy_radius":"5"},"country":{"names":{"en":"Hungary"},"iso_code":"HU","geoname_id":"719819"},"continent":{"names":{"en":"Europe"},"geoname_id":"6255148","code":"EU"},"city":{"names":{"en":"Budapest"},"geoname_id":"3054643"}},"PROGRAM":"prg00000","PRIORITY":"info","PID":"1234","MESSAGE":"test message","HOST":"192.168.1.1","FACILITY":"auth","DATE":"May 24 13:09:46"}

Transferring your logs to Elasticsearch using GeoIP2

If you are transferring your log messages into Elasticsearch, use the following rewrite rule to combine the longitude and latitude information into a single value (called geoip2.location), and set the mapping in Elasticsearch accordingly. Do not forget to include the rewrite in your log path. These examples assume that you used prefix("geoip2.") instead of the default for the geoip2 parser. For details on transferring your log messages to Elasticsearch, see elasticsearch2: Sending messages directly to Elasticsearch version 2.0 or higher (DEPRECATED).

rewrite r_geoip2 {
    set(
        "${geoip2.location.latitude},${geoip2.location.longitude}",
        value( "geoip2.location2" ),
        condition(not "${geoip2.location.latitude}" == "")
    );
};

In your Elasticsearch configuration, set the appropriate mappings:

{
   "mappings" : {
      "_default_" : {
         "properties" : {
            "geoip2" : {
               "properties" : {
                  "location2" : {
                     "type" : "geo_point"
                  }
               }
            }
         }
      }
   }
}

Options of geoip2 parsers

The geoip2 parser has the following options.

Statistics of syslog-ng

The syslog-ng OSE application collects various statistics and measures different metrics about the messages it receives and delivers. These metrics are collected into different counters, depending on the configuration of syslog-ng OSE. The stats-level() global option determines exactly which statistics syslog-ng OSE collects. You can access these statistics and metrics using the following methods.