DNS模块dnspython应用及业务监控示例
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1 dnspython处理模块的安装，源码方式
wget http://www.dnspython.org/kits/1.9.4/dnspython-1.9.4.tar.gz
tar zxf dnspython-1.9.4.tar.gz
cd dnspython-1.9.4/
python setup.py install
2 解析示例
A记录查询示例
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import dns.resolver
domain = raw_input("请输入一个需要解析的域名：")
A = dns.resolver.query(domain,'A')
for i in A.response.answer:
for j in i.items:
if j.rdtype == 1:
print j.addressMX记录示例
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import dns.resolver
domain=raw_input('请输入一个域名：')
MX=dns.resolver.query(domain,'MX')
for i in MX:
print i.preference, i.exchangeNS记录示例
import dns.resolver
domain=raw_input('请输入一个域名：')
NS=dns.resolver.query(domain,'NS')
for i in NS.response.answer:
for j in i.items:
print j.to_text()CNAME记录示例
import dns.resolver
domain=raw_input('请输入一个域名：')
cname=dns.resolver.query(domain,'CNAME')
for i in cname.response.answer:
for j in i.items:
print j.to_text()3 利用dns域名轮训监控业务
监控示例
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import dns.resolver
import os
import httplib
iplist=[]
appdomain="www.ctrip.com"
def get_iplist(domain=""):
try:
A=dns.resolver.query(domain,'A')
except Exception,e:
print "dns resolver error:"+str(e)
for i in A.response.answer:
for j in i.items:
if j.rdtype == 1:
iplist.append(j.address)
return True
def checkip(ip):
checkurl=ip+":80"
getcontent=""
httplib.socket.setdefaulttimeout(5)
conn=httplib.HTTPConnection(checkurl)
try:
conn.request("GET","/",headers={"Host":appdomain})
r=conn.getresponse()
getcontent=r.read(15)
finally:
print getcontent
if getcontent=="<!DOCTYPE html>":
print ip+":80端口正常 [ok]"
else:
print ip+":80端口异常 [error]"
if __name__=="__main__":
if get_iplist(appdomain) and len(iplist)>0:
for ip in iplist:
checkip(ip)
else:
print "dns resolver error"执行 python test1.py
<!DOCTYPE html>
118.89.206.133:80 端口正常 [ok]
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