Deep Diving into Docker and Containers: What It Is and How It Works
medium.comBig fan of the following talk that explains how containers work from the ground up.
Containers From Scratch • Liz Rice • GOTO 2018 - https://www.youtube.com/watch?v=8fi7uSYlOdc
Also recommend this Docker implementation in around 100 lines of bash: https://github.com/p8952/bocker