rails official docker image

Rails is an open-source web application framework written in Ruby.

Supported tags and respective Dockerfile links

For more information about this image and its history, please see the relevant manifest file (library/rails) in the docker-library/official-images GitHub repo.

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.

wikipedia.org/wiki/Ruby_on_Rails

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How to use this image

Create a Dockerfile in your Rails app project

FROM rails:onbuild

Put this file in the root of your app, next to the Gemfile.

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 rails server.

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://localhost:8080 or http://host-ip:8080 in a browser.

Generate a Gemfile.lock

The 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 Gemfile:

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.

Image Variants

The rails images come in many flavors, each designed for a specific use case.

rails:

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.

rails:onbuild

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.

License

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.


Docker, Inc is the company behind the open source Docker platform and the growing Docker ecosystem of contributors, partners and adopters revolutionizing the way distributed applications are built, shipped, and run.



Website: docker.com

Docker Registery: Rails Official Docker Image




Copyright (c) 2014-2015 Docker, Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


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Updated:
May 14, 2015