Phusion Blog

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. Learn more at the Github repository and the website, which explain in detail what the problems are with the stock Ubuntu base image, and why you should use baseimage-docker.

Changes in this release

• Upgraded to Ubuntu 14.04 (Trusty). We will no longer release images based on 12.04.
  Thanks to contributions by mpeterson, Paul Jimenez, Santiago M. Mola and Kingdon Barrett.
• Fixed a problem with my_init not correctly passing child processes’ exit status. Fixes GH-45.
• When reading environment variables from /etc/container_environment, the trailing newline (if any) is ignored. This makes commands like this work, without unintentially adding a newline to the environment variable value:

  echo my_value > /etc/container_environment/FOO
  

  If you intended on adding a newline to the value, ensure you have two trailing newlines:

  echo -e "my_value\n" > /etc/container_environment/FOO
  

• It was not possible to use docker run -e to override environment variables defined in /etc/container_environment. This has been fixed (GH-52). Thanks to Stuart Campbell for reporting this bug.

Using baseimage-docker

Please learn more at the README.