python 多线程实现检测服务器在线情况

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](http://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](http://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)