close wait 服务器有大量的close wait

建立连接后常用的三个状态是：ESTABLISHED 表示正在通信，TIME_WAIT 表示主动关闭，CLOSE_WAIT 表示被动关闭。



url(r'^testtimedout/$', newview.testtimedout),



# !/usr/bin/env python
# -*- coding: utf-8 -*-
import urllib2
import urllib
import cookielib
import json
import httplib
import re
import requests
import os
import time

import requests, requests.utils, pickle

try:
    import cookielib  # 兼容Python2
except:
    import http.cookiejar as cookielib

from requests.packages.urllib3.exceptions import InsecureRequestWarning

requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
url='http://192.168.137.3:9000/testtimedout'
while True:
   try:
    s = requests.session()
    r = s.get(url, verify=False,timeout=5)
    print r.content
   except:
       print '222222222'
	   


原因 A 调用B, A超时后 A没有关闭连接,导致B close wait


node2:/root#netstat -na | grep 9000 | grep -i close 
tcp        1      0 192.168.137.3:9000          192.168.137.1:49819         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49855         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49823         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49845         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49825         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49815         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49813         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49851         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49843         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49821         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49834         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49847         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49841         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49832         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49827         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49853         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49836         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49809         CLOSE_WAIT  
tcp        1      0 192.168.137.3:9000          192.168.137.1:49811         CLOSE_WAIT