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Ruby Sinatra docker

Docker for hosting Sinatra apps

Running your Sinatra app

docker run --name my-sinatra-app \
    -p 80:80 \
    -v /path/to/sinatra/app:/usr/src/app \
    -d erikap/ruby-sinatra

The Docker image exposes port 80.

The Ruby source code is mounted in /usr/src/app. The main Sinatra file is configured at container start up via the MAIN_APP_FILE environment variable. If not set, it defaults to web.rb.

Dependencies can be installed through Bundler by providing a Gemfile. The Sinatra gem is installed by default. The environment can be set via the RACK_ENV environment variable. If not set, it defaults to production.

The image uses Sinatra Reloader for automatic reload. To enable the reload, add the following line in your MAIN_APP_FILE

require 'sinatra/reloader' if development?

To ensure that stopping of the container happens instantly, start docker with the --init option or use init: true when using a docker-compose.yml file.