需要ping一个网段所有机器的在线情况，shell脚步运行时间太长，用python写个多线程ping吧，代码如下：
#!/usr/bin/python
#coding=utf-8
”’
created on 2015-8-4
@author: administrator
”’
import threading,subprocess
from time import ctime,sleep,time
import queue
queue=queue.queue()
class threadurl(threading.thread):
def __init__(self,queue):
threading.thread.__init__(self)
self.queue=queue
def run(self):
while true:
host=self.queue.get()
ret=subprocess.call(‘ping -c 1 -w 1 ‘+host,shell=true,stdout=open(‘/dev/null’,’w’))
if ret:
print “%s is down” % host
else:
print “%s is up” % host
self.queue.task_done()
def main():
for i in range(100):
t=threadurl(queue)
t.setdaemon(true)
t.start()
for host in b:
queue.put(host)
queue.join()
a=[]
with open(‘ip.txt’) as f:
for line in f.readlines():
a.append(line.split()[0])
#print a
b=[‘192.168.3.’+str(x) for x in range(1,254)] #ping 192.168.3 网段
start=time()
main()
print “elasped time:%s” % (time()-start)
#t2=threading.thread(target=move,args=(‘fff’,))
#threads.append(t2)
”’
for i in a:
print ctime()
ping(i)
sleep(1)
if __name__ == ‘__main__’:
for t in range(len(a)):
#t.setdaemon(true)
threads[t].start()
#t.join()
print “all over %s” % ctime()
”’
效果如下：
平一个网段只要2.7s左右，够快！！！
再给大家分享一个检测外网服务器的方法及代码
经常使用python检测服务器是否能ping通, 程序是否正常运行（检测对应的端口是否正常）
以前使用shell脚本的写法如下：
pingret=$( ping www.baidu.com -c 2 | grep “icmp_” ); if [ -z $pingret ]; then echo “ping fail”; else echo “ping ok”; fi
或者
ping -c 2 www.baidu.com|grep “icmp_” && echo ‘ping ok’ || echo ‘ping fail’
代码示例：
#!/usr/bin/python
# encoding=utf-8
# filename: net_is_normal.py
import os
import socket
import subprocess
#判断网络是否正常
server=’www.baidu.com’
#检测服务器是否能ping通，在程序运行时，会在标准输出中显示命令的运行信息
def pingserver(server):
result=os.system(‘ping ‘+server+’ -c 2′)
if result:
print ‘服务器%s ping fail’ % server
else:
print ‘服务器%s ping ok’ % server
print result
#把程序输出定位到/dev/null,否则会在程序运行时会在标准输出中显示命令的运行信息
def pingservercall(server):
fnull = open(os.devnull, ‘w’)
result = subprocess.call(‘ping ‘+server+’ -c 2′, shell = true, stdout = fnull, stderr = fnull)
if result:
print ‘服务器%s ping fail’ % server
else:
print ‘服务器%s ping ok’ % server
fnull.close()
#可用于检测程序是否正常，如检测redis是否正常，即检测redis的6379端口是否正常
#检测ssh是否正常，即检测ssh的22端口是否正常
def check_aliveness(ip, port):
sk = socket.socket(socket.af_inet, socket.sock_stream)
sk.settimeout(1)
try:
sk.connect((ip,port))
print ‘server %s %d service is ok!’ %(ip,port)
return true
except exception:
print ‘server %s %d service is not ok!’ %(ip,port)
return false
finally:
sk.close()
return false
if __name__==’__main__’:
pingservercall(server)
pingserver(server)
check_aliveness(‘192.168.230.128’, 6379)