With this snippet of code you can create a Linux Init Script to be placed in "/etc/init.d/" an set it as a daemon with "chkconfig --add this" command.

NodeJs - InitScript.sh

#!/usr/bin/env bash
# chkconfig: 2345 20 80
# description: Description comes here....

start() {
 # code to start app comes here
 /path/to/forever start /path/to/app.js
}

stop() {
 # code to stop app comes here
 /path/to/forever stop /path/to/app.js
}

case "$1" in 
start)
  start
	;;
stop)
	stop
	;;
restart)
	stop
	start
	;;
*)
	 echo "Usage: $0 {start|stop|restart}"
esac

exit 0