Capistrano rolling restart for passenger / nginx

cap_rolling_restart.rb

  desc "Restarts app servers in a rolling fashion, one by one with wait in between"
  task :rolling_restart, roles: [:passenger] do
    servers = find_servers_for_task(current_task)
    servers.each do |s|
      run "touch #{current_path}/tmp/restart.txt", hosts: s.host
      puts "#{s.host} restarting...I'm sleep doe."
      sleep 45
      status = capture "sudo passenger-status; true", hosts: s.host
      # Sometimes nginx/passenger is a bit wonky and fails to restart?
      # Not sure if it's because of the load balancer fucking things up or what
      unless status.match("Requests in top-level queue")
        puts "Passenger probably shit the bed...restarting nginx"
        sudo "/etc/init.d/nginx restart; true", hosts: s.host
        sleep 30
      end
    end
  end