http {

   passenger_root /usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30;

   passenger_ruby /usr/local/bin/ruby;

   passenger_min_instances 3;    //此处设置起始进程数为3

   passenger_pre_start http://blog.bccn.net/sessions/seccode_check;

   passenger_max_pool_size 6;

   passenger_pool_idle_time 60;