【Python自动化运维】DNS轮询技术
2016-06-15 11:32
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DNS轮询技术主要先解析出所有主机,然后可通过http请求方式测试主机,再决定是否将请求发送到此主机,实现负载均衡。
结构图如下:
图.1
DNS域名解析代码清单:
具体实现转发请求不实现
#!/usr/bin/python
#-*- coding: utf-8 -*-
import sys
import dns.resolver
import httplib
IP=[]
def Get_IP_List(domain=""):
AB = None
try:
AB = dns.resolver.query(domain, 'A')
except Exception,e:
print "dns.resolver.query:",str(e)
finally:
if AB is not None:
for i in AB.response.answer:
for j in i.items:
#query第二个参数明明指定是返回'A'记录,测试了一下www.baidu.com,居然'CNAME'也返回了,增加异常处理
#print type(j)
try:
IP.append(j.address)
except Exception,e:
continue
return True
def Check_IP(ip, i):
checkurl = ip+":80"
httplib.socket.setdefaulttimeout(5)
conn = httplib.HTTPConnection(checkurl)
ret = None
content = None
try:
conn.request("GET", "/", headers={"Host":sys.argv[i]})
ret = conn.getresponse()
content = ret.read(15)
finally:
if content == "<!DOCTYPE HTML>" or content == "<!doctype html>":
print ip+" [OK]"
else:
print ip+" [ERROR]"
if __name__ == "__main__":
arglen = len(sys.argv)
for i in range(1,arglen):
print "-"*20
print sys.argv[i]
Get_IP_List(sys.argv[i])
for ip in IP:
Check_IP(ip, i)
print "-"*20
结构图如下:
图.1
DNS域名解析代码清单:
具体实现转发请求不实现
#!/usr/bin/python
#-*- coding: utf-8 -*-
import sys
import dns.resolver
import httplib
IP=[]
def Get_IP_List(domain=""):
AB = None
try:
AB = dns.resolver.query(domain, 'A')
except Exception,e:
print "dns.resolver.query:",str(e)
finally:
if AB is not None:
for i in AB.response.answer:
for j in i.items:
#query第二个参数明明指定是返回'A'记录,测试了一下www.baidu.com,居然'CNAME'也返回了,增加异常处理
#print type(j)
try:
IP.append(j.address)
except Exception,e:
continue
return True
def Check_IP(ip, i):
checkurl = ip+":80"
httplib.socket.setdefaulttimeout(5)
conn = httplib.HTTPConnection(checkurl)
ret = None
content = None
try:
conn.request("GET", "/", headers={"Host":sys.argv[i]})
ret = conn.getresponse()
content = ret.read(15)
finally:
if content == "<!DOCTYPE HTML>" or content == "<!doctype html>":
print ip+" [OK]"
else:
print ip+" [ERROR]"
if __name__ == "__main__":
arglen = len(sys.argv)
for i in range(1,arglen):
print "-"*20
print sys.argv[i]
Get_IP_List(sys.argv[i])
for ip in IP:
Check_IP(ip, i)
print "-"*20
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