#coding: utf-8 import socket import select import time import os import threading def ser():     s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)     s.bind(("",43244))     while 1:         infds,outfds,errfds = select.select([s],[],[],5)         if infds:             sms = s.recv(1024)             if sms=="alived":                 print "peer is alived"         else:             print "Can't hear peer!"             os.system("./failover.sh") def clt():        while 1:        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)         sock.connect(('192.168.10.1', 43244))        sock.send("alived")        time.sleep(2) if __name__=="__main__":     ser=threading.Thread(target=ser)     clt=threading.Thread(target=clt)     ser.start()     clt.start()     ser.join()     clt.join()

#!/bin/bash vip=8.8.8.8 vip_local=`ifconfig |grep -A 1 "eth0:0" |awk '/inet addr/{print $2}'|cut -d ":" -f2` if [ ! $vip_local ];then ifconfig eth0:0 $vip netmask 255.255.255.0 up;fi