How: to install docker on Raspberry pi

Tested on RPI 1 model B

Read the full article or follow my steps

# sudo apt-get update
# sudo apt-get upgrade
# curl -sSL https://get.docker.com | sh

* Once installed, follow the instructions to add user to docker group. (This is to allow user to run docker)
* These steps can be applied to any linux OS not just raspberry pi. Tested on Ubuntu as well.