deploy.rb

require 'bundler/vlad'

set :application, "project-name"
set :domain, "server-name-in-ssh-config"
set :deploy_to, "/var/www/html/#{application}"
set :repository, "ssh://git@bitbucket.org/bryanthompson/#{application}.git"

namespace :vlad do
  namespace :ec2 do

    desc "deploys latest code, symlinks media, stops and starts service"
    remote_task :deploy => %w(update prepare bundle stop start)

    desc "bundle install gems on production"
    remote_task :bundle, :roles => :app do
      run "cp #{deploy_to}/current/config/nginx.project.conf /etc/nginx/conf.d/unicorn_sites/project.conf"
      run "cd #{deploy_to}/current; bundle --without development install"
    end
 
    desc "prepares permissions and media symlinks"
    remote_task :prepare, :roles => :app do
      run "cd #{deploy_to}/current && ln -s #{deploy_to}/media ."
    end

    %w(start stop).each do |task|
      desc "#{task.capitalize} this pedia site on production"
      remote_task task, :roles => :app do
        run "#{deploy_to}/current/bin/unicorn.sh #{task}"
      end
    end
  end
end

unicorn.conf

worker_processes 1
timeout 30

listen "/var/run/unicorn/project.sock"
pid "/var/run/unicorn/project.pid"
stderr_path "/var/log/nginx/project-unicorn-stderr.log"

unicorn.sh

#!/bin/bash

UNICORN=$rvm_path/gems/$RUBY_VERSION/bin/unicorn
KILL=/bin/kill
APP_ROOT=/var/www/html/project/current
PID=/var/run/unicorn/project.pid
GEM_HOME=$rvm_path/gems/$RUBY_VERSION

sig () {
  test -s "$PID" && kill -$1 `cat $PID`
}

case "$1" in
        start)
                echo "Starting unicorn..."
                cd $APP_ROOT
                $UNICORN -D -E production -c $APP_ROOT/config/unicorn.conf
                ;;
        stop)
                sig QUIT && exit 0
                echo >&2 "Not running"
                ;;
        restart)
                $0 stop
                $0 start
                ;;
        status)
                ;;
        *)
                echo "Usage: $0 {start|stop|restart|status}"
                ;;
esac