saying-hello-world-with-ruby-on-rails.Dockerfile

FROM ruby:alpine

RUN apk add build-base && \
    rm -rf /var/cache/apk/*

RUN mkdir /app
COPY . /app/

WORKDIR /app
RUN bundle install

CMD ["puma","-b","tcp://0.0.0.0:4567"]

saying-hello-world-with-ruby-on-rails.Gemfile

source "https://rubygems.org"

gem 'sinatra'
gem 'puma'

saying-hello-world-with-ruby-on-rails_app.rb

require 'sinatra'
require 'puma'

configure {
  set :server, :puma
}

class App < Sinatra::Base

  get '/' do
    "Hello World with Ruby!"
  end

  get '/hi' do
    "Hi!"
  end


  get '/health' do
    "Im Alive, TimeStamp: #{Time.now}"
  end

end

saying-hello-world-with-ruby-on-rails_config.ru

source "https://rubygems.org"

gem 'sinatra'
gem 'puma'