In my thesis I selected and analyzed the virtualization technologies that are most widely utilized and created a set of host hardening policies for a Docker environment. The starting point was the research of the current state of the art of virtualization technologies that can were divided in three main categories, based on their implementation: type 1 hypervisors, type 2 hypervisors and OS virtualization. Based on the diffusion of the technologies in the automotive development and testing world we decided to analyze further two products, one classified as type 1 hypervisor since is the most common technology found in automotive embedded systems and one OS virtualization product that is very flexible and suitable for testing.