问题
I'm trying to connect to an rabbitMQ server but the it keeps failing on connection with a socket.error: protocol not found error.
In [1]: import pika
In [2]: pika.BlockingConnection(pika.ConnectionParameters('ip_of_server'))
with error output of
---------------------------------------------------------------------------
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
I read this as it was failing on the socket.getprotobyname line in base_connection.pyc. I then tried to use socket.getprotobyname on it's own and I keep getting error: protocol not found. It obviously can't fine my TCP connection.
From what I can tell, it should output 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
I am using Ubuntu 14.04 and python 2.7.6 and I have no idea how to troubleshoot this error.
I've read some threads about the /etc/protocols file, but I do not seem to have one. Can this be the problem? If so, is there a generic file I can download or a method to create one?
回答1:
Yes, you should have a /etc/protocols file. It must have been deleted somehow. It comes from the netbase package.
This should reinstall it:
sudo apt-get -o Dpkg::Options::="--force-confmiss" install --reinstall netbase
(Further details at https://askubuntu.com/questions/66533/how-can-i-restore-configuration-files)
来源：https://stackoverflow.com/questions/40184788/protocol-not-found-socket-getprotobyname