docker.rb

#!/usr/bin/env ruby

require 'docker'

image = Docker::Image.get('ubuntu')

loop do
  container = Docker::Container::create(
    'Image' => image.id,
    'Cmd'   => '/bin/ls',
  )

  begin
    container.start
    begin
      stdout, stderr = container.attach
      result = container.wait
      p stdout
    rescue
      container.kill
    end
  ensure
    container.delete
  end
end