Python监控主机是否存活,并发报警邮件

#!/usr/bin/env python
# coding:UTF-8
import time
import pexpect
import smtplib
from email.mime.text import MIMEText

mail_host = "smtp.163.com"         #定义smtp服务器
mail_to = "baojingtongzhi@163.com"  #邮件收件人
mail_from = "monitor@163.com"       #邮件发件人
mail_pass = "123456"            #邮件发件人邮箱密码

while True:
    def Mail(error_ip):
        date = time.strftime('%Y-%m-%d %H:%M:%S')
        msg = MIMEText("%s Ping %s failed from 255.252." % (date, error_ip))
        msg['Subject'] = "Ping %s failed." % error_ip    #定义邮件主题
        msg['From'] = mail_from
        msg['To'] = mail_to
        try:
            s = smtplib.SMTP()                 #创建一个SMTP()对象
            s.connect(mail_host, "25")             #通过connect方法连接smtp主机
            s.starttls()                    #启动安全传输模式
            s.login(mail_from,mail_pass)          #邮箱账户登录认证
            s.sendmail(mail_from, mail_to, msg.as_string())   #邮件发送
            s.quit()       #断开smtp连接
        except Exception, e:
            print str(e)
    ip_list = ['192.168.18.10',
        '192.168.18.11',
        '192.168.18.12']
    for ip in ip_list:
        ping = pexpect.spawn('ping -c 1 %s' % ip)
        check = ping.expect([pexpect.TIMEOUT,"1 packets transmitted, 1 received, 0% packet loss"],2)    #2代表超时时间
        if check == 0:
            Mail(ip)
            print "Ping %s failed,Have email." % ip
        if check == 1:
            print "Ping %s successful." % ip
    print "Sleep 10s..."
    time.sleep(10)