rsyslog-solr is a couple of scripts and configs to write syslog mesages into solr to allow full text searches. Currently just a proof of concept and needs further work.
You'll need ruby and solr. On Debian/Ubuntu you can install the ruby and solr-jetty packages.
Copy the rsyslog-solr script to /usr/local/bin and copy the rsyslog-solr.conf upstart script into /etc/init
The following lines added to your /etc/rsyslog.conf will get the log entries written to the named pipe in the right format:
$template SolrFormat,"<doc><field name='from'>%FROMHOST%</field> <field name='facility'>%syslogfacility-text%</field> <field name='msg'><![CDATA[%msg%]]></field> <field name='hostname'>%HOSTNAME%</field> <field name='priority'>%syslogpriority%</field> <field name='tag'>%syslogtag%</field> <field name='program'>%programname%</field> <field name='severity'>%syslogseverity-text%</field> <field name='generated'>%timegenerated:::date-rfc3339%</field></doc>\n" *.* |/tmp/rsyslog-solr;SolrFormat
Then configure your others hosts to log centrally to this server.
Copy the schema.xml to /usr/share/solr/conf/schema.xml and start/restart solr. Schema changes don't take effect if you've already written data to the solr db, so you'll need to wipe it out if you didn't do this before the other bits (rm -rf /var/lib/solr/data/)
Log lines are written to solr in batches of 10, and each batch should be available for search within 10 seconds by default.
Use the rsyslog-solr-search script to conduct searches.
The environment variable LIMIT sets how many results to display, and PAGE let's you page through the results.
find failed logins
$ rsyslog-solr-search failed password page 1 of 50555 hits for search "failed password" 2011-03-03T12:31:12.402385+00:00 srv-g1xxx sshd Failed password for invalid user password from 18.104.22.168 port 63741 ssh2 2011-03-03T12:16:43.272207+00:00 srv-5axxx sshd Failed password for invalid user password from 22.214.171.124 port 35110 ssh2 2011-03-03T20:23:56.767459+00:00 srv-d2xxx sshd Failed password for root from 126.96.36.199 port 43757 ssh2
show all log message from the last hour
$ rsyslog-solr-search timestamp:[NOW-1HOUR TO NOW] page 1 of 1800 hits for search "timestamp:[NOW-1HOUR TO NOW]"
any user that can generate logs that are sent to the system can cause a denial of service attack by sending specially malformed messages. This can be fixed by moving the formatting of the log entries from rsyslog into the ruby script, but I've not done it yet.
the timestamp field is actually the time the line was received by solr, not the time it was generated. This can again be fixed by moving the formatting into the ruby script.
John Leach (firstname.lastname@example.org)
Copyright © 2011 John Leach