Can connect to server using mongo or telnet but can't using pymongo

[Alex Dong]

Hi there,

I'm having two servers: clifton and fairfield. MongoDb is running on
clifton. I have configured the firewall so that clifton will accept
traffic from fairfield targeting port 27017. (Yes, I've double-checked
mongodb.conf to make sure mongo is listening on 27017).

Now the weird thing is this: on fairfield, if I try to connect to
mongodb on clifton using `telnet clifton 27017` or `mongo clifton/
test`, I can get a connection without any problem. But if I tried to
do so using pymongo, I'll get this error message:

{{{
In [1]: from pymongo.connection import Connection
In [2]: Connection('clifton', 27017)
---------------------------------------------------------------------------
AutoReconnect Traceback (most recent call
last)


/usr/local/lib/python2.6/dist-packages/pymongo-1.7-py2.6-linux-
x86_64.egg/pymongo/connection.py in __init__(self, host, port,
pool_size, auto_start_request, timeout, slave_okay, network_timeout,
document_class, _connect)
183
184 if _connect:
--> 185 self.__find_master()
186
187 @staticmethod

/usr/local/lib/python2.6/dist-packages/pymongo-1.7-py2.6-linux-
x86_64.egg/pymongo/connection.py in __find_master(self)
450 sock.close()
451 if sock_error or self.__host is None:
--> 452 raise AutoReconnect("could not find master")
453 raise ConfigurationError("No master node in %r. You
must specify "
454 "slave_okay to connect to "

AutoReconnect: could not find master
}}}

My environment:
Ubuntu 9.10
MongoDB: 1.5.3
Pymongo: 1.7

Any hints?

Alex

[Michael Dirolf]

When you connect w/ the shell can you successfully perform operations
(i.e. try saving a document and doing a findOne)?

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[Rich Shea]

I've seen a similar case on one of my client machines. I found that I
needed to run python as superuser ('sudo python') on that machine in
order for the connection to work. I figured that I had installed
something slightly differently on that machine, but have never gone
back to figure out what. This has only happened on one machine of many
(all Ubuntu 9.10).

[Лоик]

You installed/run pymongo from a virtual env or from the distro environment. I never had any issue like that. I run all my projects from virtual env. Still a bit weird that it would need to run as root.

Rich, that's a bit weird. If you don't run it as root. Does it work sometimes or it never connect? I don't see any reason for pymongo to be ran as root.

Loïc

[Rich Shea]

fwiw - in my case that I mentioned, on the particular machine I am
always required to run python as root to connect via pymongo. For my
application I actually run pymongo within a daemon that is running as
a user in the sudo group, so I didn't encounter the problem until I
was using the python shell and manually creating the connection to the
database.