In this presentation Carlos Sanchez will share his experience running Jenkins at scale, using Docker and Apache Mesos to create one of the biggest (if not the biggest) Jenkins clusters to date. By taking advantage of Apache Mesos, the Jenkins platform is dynamically scaled to run jobs across hundreds of Jenkins masters, on Docker containers distributed across the Mesos cluster. Jenkins slaves are dynamically created based on load, using the Jenkins Mesos and Docker plugins, running in containers distributed across multiple hosts, and isolating job execution. This presentation will allow a better understanding of Apache Mesos and the challenges of running Docker containerized and distributed applications, particularly JVM ones, by sharing a real world use case, including good and bad decisions and how they affected the development.