Docker container for Rails based on the new Heroku-16 base image.

• 2.3.4 (2.3.4/Dockerfile)
• 2.3.7 (2.3.7/Dockerfile)
• 2.4.4 (2.4.4/Dockerfile)
• latest,2.4.5 (2.4.5/Dockerfile)

We try to stay up-to-date with the new supported Heroku images. If you see any new one on this page feel free to open a PR!

Also there are a couple of version numbers that we have to have in sync with Heroku. Check the Dockerfile for those versions and the links where the Heroku version is kept. If you see any new version feel free to open a PR!

The Heroku base images for ruby got deprecated in favor of a more build-your-own Dockerfile strategy. But I still feel that a base image for Rails serves its purposes. There is no point for each developer to replicate much of the instructions I've used here. The more automation the better amirite?

The root folder for your Rails project must have a Gemfile and Gemfile.lock file. Then build a Dockerfile for your project with this image as base, and with other project-specific instructions (for example add some post-run scripts, see below):

FROM jfloff/docker-heroku-rails:latest
# example of post-run script
RUN echo "rake db:seed" > $POST_RUN_SCRIPT_PATH/seed.sh

Then you can either run it with standard Docker docker run --rm -ti your-project or, more commonly from a Docker Compose based development $ docker-compose up web.

For more details regarding local development with docker read this Heroku article

This container comes with a post-run script that:

• Checks and install any missing gem.
• Precompile your assets if you are in production mode (checks $RAILS_ENV value).
• Run your own run other post-run scripts. Just add them to /app/.post-run.d/ folder (you can also use the env varaible $POST_RUN_SCRIPT_PATH, which has the script path).

Subsequent runs will use cached changes. This is useful to avoid you from (1) having to rebuild the images each time there is a change on your Gemfile, (2) from having to run a shell just to deploy pending migrations, and (3) to precompile assets if you want to test production mode.

MIT (see LICENSE file)