content.md

What is JRuby?

JRuby (http://www.jruby.org) is an implementation of Ruby (http://www.ruby-lang.org) on the JVM.

Ruby is a dynamic, reflective, object-oriented, general-purpose, open-source programming language. According to its authors, Ruby was influenced by Perl, Smalltalk, Eiffel, Ada, and Lisp. It supports multiple programming paradigms, including functional, object-oriented, and imperative. It also has a dynamic type system and automatic memory management.

wikipedia.org/wiki/Ruby_(programming_language)

JRuby leverages the robustness and speed of the JVM while providing the same Ruby that you already know and love. With JRuby you are able to take advantage of real native threads, enhanced garbage collection, and even import and use java libraries.

%%LOGO%%

How to use this image

Create a Dockerfile in your Ruby app project

FROM %%IMAGE%%:9

# throw errors if Gemfile has been modified since Gemfile.lock
RUN bundle config --global frozen 1

WORKDIR /usr/src/app

COPY Gemfile Gemfile.lock ./
RUN bundle install

COPY . .

CMD ["./your-daemon-or-script.rb"]

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

You can then build and run the Ruby image:

$ docker build -t my-ruby-app .
$ docker run -it --name my-running-script my-ruby-app

Generate a Gemfile.lock

The above example Dockerfile 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 %%IMAGE%%:9 bundle install --system

Run a single Ruby script

For many simple, single file projects, you may find it inconvenient to write a complete Dockerfile. In such cases, you can run a Ruby script by using the Ruby Docker image directly:

$ docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp %%IMAGE%%:9 jruby your-daemon-or-script.rb