I thought I understood Docker until I saw the BusyBox docker image

Question

I thought I understood Docker. I understood it as a way to package up software with lots of dependencies..to basically create a little world where absolutely everything is t

Answer 1

A Busybox docker image is useful if one is building a container for which busybox can fulfill its dependency chain without needing a full Linux distro.

Often, an embedded appliance can consist of nothing but a statically-linked copy of busybox, an init script that mounts procfs, sysfs, &c. with busybox-provided tools, and then the actual application being invoked. With docker setting up the filesystem namespace, even that init script isn't necessarily needed.