init upstart script for ubuntu 12.04 and Rails 3 app

unicorn.rb

app_dir = "/home/public_forums/unstable/"
worker_processes 5

pid "#{app_dir}/tmp/pids/unicorn.pid"

# listen "#{app_dir}/tmp/sockets/public_forum.socket"
listen 5000, :tcp_nopush => true

stderr_path "#{app_dir}/log/unicorn.stderr.log"
stdout_path "#{app_dir}/log/unicorn.stdout.log"


before_fork do |server, worker|
  # the following is highly recomended for Rails + "preload_app true"
  # as there's no need for the master process to hold a connection
  defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect!
end

after_fork do |server, worker|
  # the following is *required* for Rails + "preload_app true",
  defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
end

upstart

#!upstart

description "<some app> rails server"

start on (filesystem and net-device-up IFACE=lo)
stop on shutdown

setuid <production_user>

script
/bin/bash <<EOT
export RAILS_ENV=production 
source /etc/profile

cd /home/canvas/canvas 
source .rvmrc
rails server
EOT
end script

respawn
respawn limit 10 5