Do you need a way to run unicorn like you would with webrick?

unicorn.rb

require 'fileutils'

APP_PATH     = FileUtils.pwd()
APP_PID_PATH = 'tmp/pids/unicorn.pid'
APP_PORT     = ENV['PORT']
APP_SOCKET   = "/tmp/unicorn_#{APP_PORT}.sock"

working_directory(APP_PATH)

listen(APP_SOCKET, :backlog => 64)
listen(APP_PORT, :tcp_nopush => true)
pid(File.join(APP_PATH ,APP_PID_PATH))

worker_processes(3)
timeout(30)
preload_app(true)

if GC.respond_to?(:copy_on_write_friendly=)
  GC.copy_on_write_friendly = true
end

check_client_connection(false)

before_exec do |server|
  if defined?(Dotenv)
    env = Dotenv::Environment.new('.env')
    env.each { |k, v| ENV[k] = v }
  end
end

before_fork do |server, worker|
  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.connection.disconnect!
  end

  old_pid = "#{server.config[:pid]}.oldbin"
  if old_pid != server.pid
    begin
      sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
      Process.kill(sig, File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
    end
  end
end

after_fork do |server, worker|
  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.establish_connection
  end
end

unicron.sh

#!/bin/bash

set -e

usage() {
  echo "Usage: unicron [options]"
  echo "runs unicorn in a webrick like way"
  echo
  echo "He is known as the Dark God, the Destroyer,"
  echo "the Chaos Bringer, the Planet Eater, and he"
  echo "is dedicated to consuming the universe"
  echo
  echo "-p,--port : specify the port to use"
  echo "-h,--help : display this message"
}

PORT="80$(($RANDOM % 89 + 10))"
APP_NAME="unicorn_$PORT"

while test -n "$1"; do
  case "$1" in
    -h|--help)
      usage
      exit 0
      ;;
    -p|--port)
      PORT=$2
      shift 2;
      ;;
    *)
  esac
done

onexit() {
  echo "ᕕ(ಠ_ಠ)ᕗ ᕕ(ಠ_ಠ)ᕗ ᕕ(ಠ_ಠ)ᕗ ᕕ(ಠ_ಠ)ᕗ ᕕ(ಠ_ಠ)ᕗ ᕕ(ಠ_ಠ)ᕗ"
  echo "                Stopping Unicorn"
  echo "ᕕ(ಠ_ಠ)ᕗ ᕕ(ಠ_ಠ)ᕗ ᕕ(ಠ_ಠ)ᕗ ᕕ(ಠ_ಠ)ᕗ ᕕ(ಠ_ಠ)ᕗ ᕕ(ಠ_ಠ)ᕗ"
  sleep 1
}
trap onexit SIGINT SIGTERM EXIT

export PORT=$PORT


echo "ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ"
echo "                Launching Unicorn"
echo "                  on port $PORT"
echo "ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ ᕕ(ᐛ)ᕗ"

bundle exec unicorn -c ~/bin/assets/unicorn.rb