Python - 错误98 Adress已经在使用,如何让它更快？那么杀死和快速重启它不会失败？

Question

我有一个在CentOS 6.4/64位下运行的Python协议.我有TCP服务器端口7007.在某些情况下,如更新新版本或维护或动态重启刷新缓冲区我需要重新启动应用程序:

server.py:

class AServer(threading.Thread):
  def __init__(self, port):
    threading.Thread.__init__(self)
    self.port = port

  def run(self):
    host = ''
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.bind((host, self.port))
    print bgcolors.BOOT
    s.listen(1)
    conn, addr = s.accept()
    print bgcolors.OK + 'contact', addr, 'on', self.now()

    while 1:
      try:
        data = conn.recv(1024)
      except socket.error:
        print bgcolors.OK + 'lost', addr, 'waiting..'
        s.listen(1)
        conn, addr = s.accept()
        print bgcolors.OK + 'contact', addr, 'on', self.now()
        continue
      if not data:
        ..... 
      ...

t = AServer(7007)
t.start()

即时重启(预计在1秒内运行)但失败:

$ ps aux | awk '/server.py/ {print $2}' | head -1 | xargs kill -9;
$ nohup python /var/tmp/py-protocol/server.py &
[root@IPSecVPN protocol]# python server.py
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib64/python2.6/threading.py", line 532, in __bootstrap_inner
    self.run()
  File "server.py", line 236, in run
    s.bind((host, self.port))
  File "<string>", line 1, in bind
error: [Errno 98] Address already in use

Answer 1

您的套接字处于TIME_WAIT状态,这就是即使您的程序已退出,地址仍在使用的原因.您可以在套接字退出TIME_WAIT状态之前在套接字上设置SO_REUSEADDR以重复使用它.在Python文档提出以下建议:

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((HOST, PORT))