45 lines
1.6 KiB
Markdown
45 lines
1.6 KiB
Markdown
# What is Ruby?
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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.
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> [wikipedia.org/wiki/Ruby_(programming_language)](https://en.wikipedia.org/wiki/Ruby_%28programming_language%29)
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%%LOGO%%
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# How to use this image
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## Create a `Dockerfile` in your Ruby app project
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```dockerfile
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FROM ruby:2.1-onbuild
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CMD ["./your-daemon-or-script.rb"]
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```
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Put this file in the root of your app, next to the `Gemfile`.
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This image includes multiple `ONBUILD` triggers which should be all you need to bootstrap most applications. The build will `COPY . /usr/src/app` and `RUN
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bundle install`.
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You can then build and run the Ruby image:
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```console
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$ docker build -t my-ruby-app .
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$ docker run -it --name my-running-script my-ruby-app
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```
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### Generate a `Gemfile.lock`
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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`:
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```console
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$ docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app ruby:2.1 bundle install
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```
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## Run a single Ruby script
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For many simple, single file projects, you may find it inconvenient to write a complete `Dockerfile`. In such cases, you can run a Ruby script by using the Ruby Docker image directly:
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```console
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$ docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp ruby:2.1 ruby your-daemon-or-script.rb
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```
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