http://www.amazon.co.uk/TheLogstashBookJamesTurnbullebook/dp/B00B9JQTCO
https://github.com/heroku/log-shuttle
logstash -> kibana
http://www.gridshore.nl/2013/11/10/ohnomorelogsstartwithlogstash/ https://www.digitalocean.com/community/tutorials/howtouselogstashandkibanatocentralizeandvisualizelogsonubuntu1404