利用Python写了简单测试主机是否存活脚本，此脚本不适于线上使用，因为网络延迟、丢包现象会造成误报邮件，那么后续会更新判断三次ping不通后再发报警邮件，并启用多线程处理。

#!/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)
#直接运行
# python ping.py 
Ping 192.168.18.10 successful.
Ping 192.168.18.11 successful.
Ping 192.168.18.12 successful.
Sleep 10s...

以上就是本文的全部内容，希望对大家学习Python监控主机是否存活并以邮件报警有所帮助。