The implementation of Linux Containers provides enough flexibility to isolate Applications with restricted access to CPU, memory and networking within others. While this technology is stable and production ready, there are some challenges that still needs to be addressed for the containerized application when deployed at scale: Logging. While some Applications writes their logs to the file system, others use the generic STDOUT and STDERR interfaces; when the application runs on top of a specific framework or virtual machine (JVM), it may generate some extra information. Since monitoring is a must, handling this Data coming from different sources and formats adds an exponential complexity, specially when scaling to thousands of Containers. In this presentation, I will describe the Logging challenges for Containers and how this is being solved in production environments using Fluentd