Beginning DevOps with Docker

Virtualization versus Containerization

This block diagram gives an overview of a typical virtual machine setup:

In virtual machines, the physical hardware is abstracted, therefore we have many servers running on one server. A hypervisor helps do this.

Virtual machines do sometimes take time to start up and are expensive in capacity (they can be GBs in size), although the greatest advantage they have over containers is the ability to run different Linux distributions such as CentOS instead of just Ubuntu:

In containerization, it is only the app layer ...