Build Your Own Docker with Linux Namespaces, cgroups, and chroot: Hands-on Guide

https://akashrajpurohit.com/blog/build-your-own-docker-with-linux-namespaces-cgroups-and-chroot-handson-guide/

Use Ubuntu image why?

But disk space is cheap, and you aren’t really losing much other than disk space for unused portions of the OS that are in a container, but what you gain is a normalized environment that’s easy to develop for, test, and add to as needed.