Docker is open source engine that can help you automate the deployment of applications inside software containers. Is was released in March 2013 and has been gaining popularity ever since. It has over 100 million downloads, and over 75000 applications are running as dockerized applications – that is a LOT! Apache Mesos is an open source cluster manager that provides efficient resource isolation and sharing across distributed applications or frameworks. Mesosphere DC/OS is an enterprise-grade datacenter-scale operating system, providing a single platform for running containers, big data, and distributed apps in production. DC/OS is built on the Apache Mesos core and provides newer technology including the native container-orchestration, Marathon application platform, intuitive user interfaces and much more. Knowledge and experience about Docker, Apache Mesos, and DC/OS could be very valuable for your career.