config/deploy.rb

deploy.rb

require 'bundler/capistrano'
require "rvm/capistrano"
require 'capistrano/ext/multistage'
load 'deploy/assets'

set :rvm_path,     '/home/<USERNAME>/.rvm'
set :rvm_bin_path, '/home/<USERNAME>/.rvm/bin'
set :repository,  'git@github.com:<GIT_USERNAME>/<REPOSITORY_NAME>.git'

set :scm,         :git
set :deploy_via, :remote_cache
set :copy_exclude, ['.git']

set :rvm_ruby_string, 'ruby-1.9.3-p194'

set :use_sudo,    false
set :normalize_asset_timestamps, false    # For Rails 3.1

default_run_options[:pty]   = true
ssh_options[:forward_agent] = true

namespace :deploy do
  task :restart do
    run "cd #{current_path}; touch tmp/restart.txt"
  end

  task :sql_symlink do
    run "ln -nfs #{shared_path}/config/database.yml #{release_path}/config/database.yml"
  end
end

namespace :unicorn do
  task :start do
    run "cd #{deploy_to}/current && unicorn_rails -c #{deploy_to}/current/config/unicorn.rb -E #{rails_env} -D"
  end

  task :stop do
    run "kill -s QUIT `cat #{deploy_to}/shared/pids/unicorn.pid`"
  end

  task :restart do
    run "kill -s USR2 `cat #{deploy_to}/shared/pids/unicorn.pid`"           # needs if preload_app = true
  end
end

before 'deploy:assets:precompile', 'deploy:sql_symlink'
after 'deploy:update', 'unicorn:restart', 'deploy:cleanup'