Re: Pyro-core Digest, Vol 68, Issue 2 - 4 Basic Example Question

I was having intermittent connection problems between my Virtualbox Windows
7 64bit Host and my Ubuntu 12.04 32bit VM/guest. Since these connections
problems were not reproducible on the other Ubuntu 10.10 32bit VM/guest I
was a little lost. I have bridged networking set up on both machines. It
seems that configuring the Promiscuous Mode to Allow All solves the problem
but still I can't figure out why it was a problem with the newer Ubuntu and
not older, since the older is still configured to Deny Promiscuous Mode.

My 2cents

---------- Forwarded message ----------
From: TCG TCGUtility <[email protected]>
To: [email protected]
Cc:
Date: Wed, 26 Sep 2012 00:51:35 +1200
Subject: [Pyro] Basic Example Question
I think I have a network issue but I just want to be sure I'm doing
completely the right thing.

I've got two machines: one is my laptop and the other a virtual machine
within my laptop.

It's possible to connect from laptop to vm on port 8000 for HTTP and PyRPC.
It's difficult/impossible to make connections back the other way (for
instance a web-server running on 80 or 8000 on the laptop will not be
visible to the VM).

OK so now to what I've tried.

On the Ubuntu VM I've got :

# saved as greeting.pyimport Pyro4
class GreetingMaker(object):
    def get_fortune(self, name):
        return "Hello, {0}. Here is your fortune message:\n" \
               "Behold the warranty -- the bold print giveth and the
fine print taketh away.".format(name)
greeting_maker=GreetingMaker()
daemon=Pyro4.Daemon()                 # make a Pyro
daemonuri=daemon.register(greeting_maker)   # register the greeting
object as a Pyro object
print "Ready. Object uri =", uri      # print the uri so we can use it
in the client laterdaemon.requestLoop()                  # start the
event loop of the server to wait for calls


On the Windows laptop I've got :



# saved as client.pyimport Pyro4
uri=raw_input("What is the Pyro uri of the greeting object?
").strip()name=raw_input("What is your name? ").strip()
greeting_maker=Pyro4.Proxy(uri)          # get a Pyro proxy to the
greeting objectprint greeting_maker.get_fortune(name)   # call method
normally


On the ubuntu VM I start greeting.py and this is what I see :



(venv)tcgut@ubserver1:~/dev/bibimgjobcontserver$ python greeting.py
/home/tcgut/dev/bibimgjobcontserver/venv/local/lib/python2.7/site-packages/Pyro4/core.py:155:
UserWarning: HMAC_KEY not set, protocol data may not be secure



  warnings.warn("HMAC_KEY not set, protocol data may not be secure")
Ready. Object uri = PYRO:obj_4ea116b397b94177abfe8e54d4cf8491@localhost:42049

Then on the windows laptop I start client.py and this is what I see :



(venv) C:\usr\tcgut\data\src\Python\bibimgjobcontrol>python client-greeting.py
What is the Pyro uri of the greeting object?
PYRO:obj_4ea116b397b94177abfe8e54d4cf8491@localhost:42049



What is your name? glaucon
C:\usr\tcgut\data\src\Python\bibimgjobcontrol\venv\lib\site-packages\Pyro4\core.py:155:
UserWarning: HMAC_KEY not set, protocol data may not be secure
  warnings.warn("HMAC_KEY not set, protocol data may not be secure")



Traceback (most recent call last):
  File "client-greeting.py", line 8, in <module>
    print greeting_maker.get_fortune(name)   # call method normally
  File "C:\usr\tcgut\data\src\Python\bibimgjobcontrol\venv\lib\site-packages\Pyro4\core.py",
line 149, in __call__



    return self.__send(self.__name, args, kwargs)
  File "C:\usr\tcgut\data\src\Python\bibimgjobcontrol\venv\lib\site-packages\Pyro4\core.py",
line 266, in _pyroInvoke
    self.__pyroCreateConnection()



  File "C:\usr\tcgut\data\src\Python\bibimgjobcontrol\venv\lib\site-packages\Pyro4\core.py",
line 339, in __pyroCreateConnection
    raise errors.CommunicationError(err)
Pyro4.errors.CommunicationError: cannot connect: [Errno 10061] No
connection could be made because the target machine actively refused
it



which on the surface looks like the Ubuntu VM is running a firewall
which is rejecting access on port 42049 - except
as far as I can tell it isn't running any firewall at all and (as
mentioned above) it's possible for HTTP traffic originating on



windows machine to get to a webserver on the Ubuntu VM

What I found really odd about this was providing a uri for the
server.py which said 'localhost' in the middle of it (when
I was trying to access a machine which was not localhost) so  I tried
again only this time I adapted the uri used like this :




PYRO:obj_4ea116b397b94177abfe8e54d4cf8491-Q0ErXNX1RuaBWbWMMV2pGw@public.gmane.org:42049

so that it had the ip address of the VM instead of localhost and I got
the same response ('target machine actively refused it').



So my question is ... can someone confirm that what I'm doing here
should work ! I'm assuming it's some arcane
aspect of the network setup between the windows machine and the VM
that it's hosting but I'd like to be sure.



Also is there any way I can force all traffic onto port 80 or 8000 as
I know it's possible for the two machines to
communicate on those ports.

Thanks

R.

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