Capistrano tasks for starting unicorn

Capistrano tasks for starting unicorn.rb

set :rails_env, :production
set :unicorn_binary, "/usr/bin/unicorn"
set :unicorn_config, "#{current_path}/config/unicorn.rb"
set :unicorn_pid, "#{current_path}/tmp/pids/unicorn.pid"

namespace :deploy do
  task :start, :roles => :app, :except => { :no_release => true } do 
    run "cd #{current_path} && #{try_sudo} #{unicorn_binary} -c #{unicorn_config} -E #{rails_env} -D"
  end
  task :stop, :roles => :app, :except => { :no_release => true } do 
    run "#{try_sudo} kill `cat #{unicorn_pid}`"
  end
  task :graceful_stop, :roles => :app, :except => { :no_release => true } do
    run "#{try_sudo} kill -s QUIT `cat #{unicorn_pid}`"
  end
  task :reload, :roles => :app, :except => { :no_release => true } do
    run "#{try_sudo} kill -s USR2 `cat #{unicorn_pid}`"
  end
  task :restart, :roles => :app, :except => { :no_release => true } do
    stop
    start
  end
end

If restart as usual, when you deploy for example, then you are right. I use reload task in the most of cases. But sometimes need to use hard reset, in case of server glitches.

The letter flag itself is optional: both kill USR2 and kill -s USR2 do the same thing.

Minor tip, might help speed up a bit. Instead of using ruby backticks for the PID, do it the UNIX way.

run "kill -s USR2 $(< #{unicorn_pid})"

Thanks