Supported tags and respective
What is Ruby on Rails?
Ruby on Rails or, simply, Rails is an open source web application framework which runs on the Ruby programming language. It is a full-stack framework. This means that "out of the box", Rails can create pages and applications that gather information from a web server, talk to or query a database, and render templates. As a result, Rails features a routing system that is independent of the web server.
How to use this image
Dockerfile in your Rails app project
Put this file in the root of your app, next to the
This image includes multiple
ONBUILD triggers which should cover most applications. The build will
COPY . /usr/src/app,
RUN bundle install,
EXPOSE 3000, and set the default command to
You can then build and run the Docker image:
docker build -t my-rails-app . docker run --name some-rails-app -d my-rails-app
You can test it by visiting
http://container-ip:3000 in a browser or, if you need access outside the host, on port 8080:
docker run --name some-rails-app -p 8080:3000 -d my-rails-app
You can then go to
http://host-ip:8080 in a browser.
onbuild tag expects a
Gemfile.lock in your app directory. This
docker run will help you generate one. Run it in the root of your app, next to the
docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app ruby:2.1 bundle install
Bootstrap a new Rails application
If you want to generate the scaffolding for a new Rails project, you can do the following:
docker run -it --rm --user "$(id -u):$(id -g)" -v "$PWD":/usr/src/app -w /usr/src/app rails rails new webapp
This will create a sub-directory named
webapp inside your current directory.
rails images come in many flavors, each designed for a specific use case.
This is the defacto image. If you are unsure about what your needs are, you probably want to use this one. It is designed to be used both as a throw away container (mount your source code and start the container to start your app), as well as the base to build other images off of.
This image makes building derivative images easier. For most use cases, creating a
Dockerfile in the base of your project directory with the line
FROM rails:onbuild will be enough to create a stand-alone image for your project.
View license information for the software contained in this image.
Supported Docker versions
This image is officially supported on Docker version 1.6.2.
Support for older versions (down to 1.0) is provided on a best-effort basis.
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