Capistrano deploy.rb

deploy.rb

namespace :deploy do

  task :start, :roles => :web, :except => { :no_release => true } do 
    run "cd #{current_path} && rvmsudo #{unicorn_binary} -c #{unicorn_config} -E #{env} -D"
  end

  task :stop, :roles => :web, :except => { :no_release => true } do 
    run "ps aux | grep unicorn | grep master | grep -v grep | awk {'print $2'} | xargs -r sudo kill -s QUIT"
    #run "rvmsudo kill -s QUIT `cat #{unicorn_pid}`"
  end
  
  #notice that we're doing sort of a rolling restart, that's not it (there's no sleep) but because we check if there's a running unicorn server before we send the USR2 we need to run the tasks for each server separately
  # unicorn_binary is the command used to run unicorn (bundle exec unicorn) and the unicorn_config is the path to the config file
  task :restart, :roles => :web, :except => { :no_release => true } do
    servers = find_servers_for_task(current_task)
    servers.each do |server|
      grep = capture "ps aux | grep unicorn | grep master | grep -v grep; true", :hosts => server
      #if unicorn isn't running, start it
      if grep.to_s == ""
        run "cd #{current_path} && rvmsudo #{unicorn_binary} -c #{unicorn_config} -E #{env} -D", :hosts => server
      else
        #otherwise, restart
        run "sudo kill -s USR2 `cat #{unicorn_pid}`", :hosts => server
      end
    end
  end

end