Cloud Native Buildpacks for Ruby

app.rb

require "sinatra"

set :bind, "0.0.0.0"
set :port, 8080

get "/" do
  "Hello My Sinatra App"
end

commands.sh

# build
$ sudo pack build sample-app-ruby2 --path . --builder heroku/buildpacks:20
# run
$ sudo docker run --rm -p 8080:8080 sample-app-ruby2

Gemfile

# frozen_string_literal: true

source "https://rubygems.org"

ruby "3.1.2"

gem "sinatra"
gem "puma"

Procfile

web: bundle exec ruby app.rb