=== Getting images ===
The first thing you need is a base image. Base image is a minimal container with an os. You can browse available images on [https://registry.hub.docker.com/ docker hub] or through the commandline.
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
busybox Busybox base image. 60 [OK]
... snip ...
flynn/busybox Busybox from Ubuntu 13.10 with libc 0
Let's get the official busybox image.
Pulling repository busybox
37fca75d01ff: Download complete
c120b7cab0b0: Download complete
f06b02872d52: Download complete
=== Running in container ===
With the image on your drive, you can give it a spin.