Honza Král - Log all the things! Many times these logs are thrown away or just sit uselessly somewhere on disk. I would like to show you how you can make sense of all that data, how to collect and clean them, store them in a scalable fashion and, finally, explore and search across various systems. ----- Centralized logging (and the ELK stack) is proving itself to be a very useful tool in managing a production infrastructure. When combined with other data sources (application logging, business data, ...) it can provide even more insight. This talk is an introduction into the area with some overview of the motivation, tools and techniques that can prove useful. We will show how the open source ELK (Elasticsearch Logstash and Kibana) stack can be used to implement this. It is geared towards people familiar with the DevOps concept that are looking to improve their lives by introducing smarter tools.