This is simply a Dockerfile for building a simple docker container that runs ruby apps.
Current ruby version: 2.2.3
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.
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.
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