restarts.rb

set :mongrel_rolling_restart_delay, 55

namespace :mongrel do
  desc <<-DESC
  Start mongrels in a loop, with a defer of [default] 30 seconds between each single mongrel restart. mongrel_rolling_restart_delay can be set to override the default.
  DESC
  task :rolling_restart, :roles => [:app], :except => {:mongrel => false} do

    set(:restart_delay) { fetch(:mongrel_rolling_restart_delay, 30) }
    run %{
          for mongrel in $(#{sudo} monit summary | grep -o -E mongrel_#{monit_group}_[0-9]+); \
          do \
            echo "Executing monit restart ${mongrel}"; \
            #{sudo} /usr/bin/monit restart ${mongrel}; \
            echo "sleeping #{restart_delay}"; \
            sleep #{restart_delay}; \
          done
          }
    puts "Done."
  end