Virtualization and Containers

Motivation

A Linux system is capable of running a lot of different applications and services at once but it is usually convenient to have systems separated in what they do: A mail server, a web server, a DNS server, a database server, etc.. could all run on the same system. But once you need to e.g. upgrade it you need to upgrade it all at once and this might be complicated in a large environment where you have different dependencies on all of this.

On the other hand: If we use a dedicated server for systems that do not need much CPU power then we are wasting a lot of resources.