d11wtq/ruby repository overview

⁠A docker container for ruby apps

This is simply a Dockerfile for building a simple docker container that runs ruby apps.

It has ruby installed to /usr/local, and runs apps under a non-root user called default. Root permissions are not needed to install gems.

Bundler and Pry are pre-installed for convenience. The container does not contain anything else.

Some tags exist in the docker registry for other ruby versions and patch levels.

⁠Usage

By default, everything runs under an unprivileged user called default, with the working directory set to /home/default.

If you just want a bash prompt:

docker run -t -i d11wtq/ruby bash

If you want to work in IRB (or Pry) temporarily:

docker run -t -i d11wtq/ruby irb
docker run -t -i d11wtq/ruby pry

If you want to load and run a rails app:

docker run -d \
  -v ~/projects/foo:/foo \
  -p 3000:3000 \
  -w /foo \
  d11wtq/ruby \
  'bundle install && rails server'

The above command mounts your copy of ~/projects/foo to /foo in the container, then sets the working directory to /foo and performs rails server to start the app running. It also exposes the container's port 3000 to the host as port 3000.

⁠Advanced Usage

A more production-ready solution is to use this image as a base image for a packaged app container. Basically install your app directly into an image and pre-run the bundle install.

FROM d11wtq/ruby

ADD /path/to/ruby-project /ruby-project
RUN cd /ruby-project; bundle install

WORKDIR /ruby-project
CMD rails server

Now you can build an image that already has your app installed:

docker build -rm -t your-username/your-project .

And you can run it easily:

docker run -name your-project -d your-username/your-project

Check the rails server logs:

docker logs your-project