Baseimage-docker is a special Docker image that is configured for correct use within Docker containers. It is Ubuntu, plus modifications for Docker-friendliness. You can use it as a base for your own Docker images.

See the original Readme Here

This fork contains following changes for my personal use:

• Changes to Ubuntu 12.04 as base image
• Allow runtime adding of SSH keys. The issue is described here
  and implemented here To add a ssh key at runtime, pass the SSH key in environment variable while running your docker container like this:

docker run --rm   -P -e SSH_KEYS="$(cat ~/.ssh/id_rsa.pub)" dkhroad/base:0.2