watch_passenger_helper_server.sh

#!/bin/sh
PATH=/bin:/usr/bin:/command

check_nginx () {
    local -a nginx_stats
    nginx_stats=(`svstat /service/nginx | cut -d ' ' -f 2,5`)
    if [ ${nginx_stats[0]} != "up" ]; then
	echo Nginx is dead.
	return 1
    fi
    if [ ${nginx_stats[1]} -lt 10 ]; then
	echo Nginx is warm-up.
	return 1
    fi
    echo Nginx is running.
    return 0
}

check_passenger () {
    local passenger_stats
    passenger_stats=`ps ax | grep 'PassengerNginxHelperServe[r]'`
    if [ $? == 0 ]; then
	echo PassengerNginxHelper is running.
	return 0
    else
	echo PassengerNginxHelper is dead.
	return 1
    fi
}

while true; do
    check_nginx
    if [ $? == 0 ]; then
	check_passenger
	if [ $? != 0 ]; then
	    sleep 2
	    check_nginx
	    if [ $? == 0 ]; then
		echo SIGTERM send to nginx.
		svc -t /service/nginx
	    fi
	fi
	sleep 5
    else
	sleep 30
    fi
done