一、Python DNS域名轮询业务监控
##！！！查看电脑是否缺少各种安装包
from dns import resolver#dnspython导入方法
import os
import httplib2
iplist=[]#定义域名ip列表变量
appdomain = 'www.baidu.com'#定义业务域名
def get_iplist(domain=""): ##解析域名为函数，解析成功将追加到iplist
try:
A = resolver.query(domain,'A')#解析A记录类型
except Exception as e:
print('dns resolver error:' + str(e))
return
for i in A:
iplist.append(i)#追加ip到iplist
return True
def checkip(ip):
checkurl = str(ip) + ":80"
getcontent=""
httplib2.socket.setdefaulttimeout(5)#定义http连接时间超时为5秒
conn = httplib2.HTTPConnectionWithTimeout(checkurl)#创建http连接对象
try:
conn.request("GET","/",headers = {"HOST": appdomain}) #发起url请求，添加主机头 ##通过构造html头访问目标业务主机
response = conn.getresponse()
getcontent = response.read(15)#获取url前15个字符，做校验用
finally:
if getcontent == b"<!DOCTYPE html>" : ##判断返回字符串是否与预期相同
#监控url一般事先定义好
print(str(ip)+'[ok]')
else:
print(str(ip)+'[error]')#此处可方警告、邮件、短信等
if __name__ =="__main__":
if get_iplist(appdomain) and len(iplist) > 0:#域名解析正确至少返回一个ip
for ip in iplist:
checkip(ip)
else:
print('dns resolve error')
