python - 未找到协议(protocol) socket.getprotobyname

Question

我正在尝试连接到 rabbitMQ 服务器，但连接失败并出现 socket.error: protocol not found 错误。

In [1]: import pika

In [2]: pika.BlockingConnection(pika.ConnectionParameters('ip_of_server'))

错误输出为

---------------------------------------------------------------------------
error                                     Traceback (most recent call last)
<ipython-input-2-7adc44418966> in <module>()
----> 1 pika.BlockingConnection(pika.ConnectionParameters('localhost')
      2 )

/usr/lib/python2.7/dist-packages/pika/adapters/blocking_connection.pyc in __init__(self, parameters)
    105
    106         """
--> 107         super(BlockingConnection, self).__init__(parameters, None, False)
    108
    109     def add_on_close_callback(self, callback_method_unused):

/usr/lib/python2.7/dist-packages/pika/adapters/base_connection.pyc in __init__(self, parameters, on_open_callback, on_open_error_callback, on_close_callback, ioloop, stop_ioloop_on_close)
     60                                              on_open_callback,
     61                                              on_open_error_callback,
---> 62                                              on_close_callback)
     63
     64     def add_timeout(self, deadline, callback_method):

/usr/lib/python2.7/dist-packages/pika/connection.pyc in __init__(self, parameters, on_open_callback, on_open_error_callback, on_close_callback)
    588         # Initialize the connection state and connect
    589         self._init_connection_state()
--> 590         self.connect()
    591
    592     def add_backpressure_callback(self, callback_method):

/usr/lib/python2.7/dist-packages/pika/adapters/blocking_connection.pyc in connect(self)
    204         """
    205         self._set_connection_state(self.CONNECTION_INIT)
--> 206         if not self._adapter_connect():
    207             raise exceptions.AMQPConnectionError('Could not connect')
    208

/usr/lib/python2.7/dist-packages/pika/adapters/blocking_connection.pyc in _adapter_connect(self)
    272         # Remove the default behavior for connection errors
    273         self.callbacks.remove(0, self.ON_CONNECTION_ERROR)
--> 274         if not super(BlockingConnection, self)._adapter_connect():
    275             raise exceptions.AMQPConnectionError(1)
    276         self.socket.settimeout(self.SOCKET_CONNECT_TIMEOUT)

/usr/lib/python2.7/dist-packages/pika/adapters/base_connection.pyc in _adapter_connect(self)
    103         # Get the addresses for the socket, supporting IPv4 & IPv6
    104         sock_addrs = socket.getaddrinfo(self.params.host, self.params.port,
--> 105                             0, 0, socket.getprotobyname("tcp"))
    106
    107         # Iterate through each addr tuple trying to connect

error: protocol not found

我读到这个是因为它在 base_connection.pyc 中的 socket.getprotobyname 行上失败了。然后我尝试单独使用 socket.getprotobyname，但我不断收到 error:protocol not found。它显然不能很好地连接我的 TCP 连接。

据我所知，它应该输出 6

In [5]: import socket

In [6]: socket.getprotobyname('tcp')
---------------------------------------------------------------------------
error                                     Traceback (most recent call last)
<ipython-input-6-3a85adf1710a> in <module>()
----> 1 socket.getprotobyname('tcp')

error: protocol not found

我使用的是 Ubuntu 14.04 和 python 2.7.6，我不知道如何解决这个错误。

我已经阅读了一些关于/etc/protocols 文件的主题，但我似乎没有。这可能是问题吗？如果是这样，是否有我可以下载的通用文件或创建方法？

Answer 1

是的，您应该有一个 /etc/protocols 文件。它一定是被某种方式删除了。它来自 netbase 包。

这应该重新安装它:

sudo apt-get -o Dpkg::Options::="--force-confmiss" install --reinstall netbase

(更多详情请访问 https://askubuntu.com/questions/66533/how-can-i-restore-configuration-files)