This script will kill a rails instance which is taking more than 500 MB and retsrat a request if it has served 100 requests

monitor_passenger_rails_instances

#!/bin/sh

while true; do

  passenger-memory-stats | grep Rails:\ /home  | awk ' { if($2 > 500) print "kill -9 " $1}' | bash
  # above line will kill all the rails instances which are using memory more than 500MB
 
  passenger-status | grep Processed:  | awk ' { if($7 > 100) print "kill -6 " $3}' | bash
  # above line will abort all rails instance who have processed 100 request. 
 
  sleep 2

done