#!/usr/bin/env python
import os, sys, time
from time import strftime

while True:
try:
ret = os.popen(‘ps -C nginx -o pid,cmd‘).readlines()
if len(ret) <2:
os.system("service nginx start")
sys.exit(0)

except Exception,ex:
print strftime("%Y-%m-%r %H:%M")
sys.exit(0)