Re: [Ryu-devel] Errors in the ryu controller

[Serdar Vural via Ryu-devel]

Hello,

I’m facing the exact same issue as in below – could you please direct me for a 
solution.
This is an Ubuntu 16.04 system (comes with Python 3.5 and Python2.7 by default).

Followed the instructions on https://github.com/faucetsdn/ryu

Kind Regards,
Serdar

From: brajesh umrao <brajeshumra...@gmail.com>
Sent: 22 July 2020 00:18
To: Ryu-devel@lists.sourceforge.net
Subject: [Ryu-devel] Errors in the ryu controller

Dear sir,
I, Brajesh Kumar Umrao currently working as a research scholar at MNNIT, 
Allahabad  U.P., India. I am facing a problem while installing the ryu 
controller.
Kindly, suggest  proper solution.

brajesh@brajesh:~/ryu$ PYTHONPATH=. ./bin/ryu-manager ryu.app.simple_switch
    Traceback (most recent call last):
         File "./bin/ryu-manager", line 18, in <module>
             from ryu.cmd.manager import main
             File "/home/brajesh/ryu/ryu/cmd/manager.py", line 22, in <module>
             from ryu.lib import hub
              File "/home/brajesh/ryu/ryu/lib/hub.py", line 19, in <module>
              from ryu.lib import ip
              File "/home/brajesh/ryu/ryu/lib/ip.py", line 19, in <module>
               import netaddr
   ImportError: No module named netaddr


brajesh@brajesh:~/ryu$ ryu-manager
    Traceback (most recent call last):
  File "/home/brajesh/.local/bin/ryu-manager", line 7, in <module>
    from ryu.cmd.manager import main
  File "/home/brajesh/.local/lib/python3.5/site-packages/ryu/cmd/manager.py", 
line 22, in <module>
    from ryu.lib import hub
  File "/home/brajesh/.local/lib/python3.5/site-packages/ryu/lib/hub.py", line 
30, in <module>
    import eventlet
  File "/home/brajesh/.local/lib/python3.5/site-packages/eventlet/__init__.py", 
line 10, in <module>
    from eventlet import convenience
  File 
"/home/brajesh/.local/lib/python3.5/site-packages/eventlet/convenience.py", 
line 7, in <module>
    from eventlet.green import socket
  File 
"/home/brajesh/.local/lib/python3.5/site-packages/eventlet/green/socket.py", 
line 21, in <module>
    from eventlet.support import greendns
  File 
"/home/brajesh/.local/lib/python3.5/site-packages/eventlet/support/greendns.py",
 line 64, in <module>
    setattr(dns, pkg, import_patched('dns.' + pkg))
  File 
"/home/brajesh/.local/lib/python3.5/site-packages/eventlet/support/greendns.py",
 line 59, in import_patched
    return patcher.import_patched(module_name, **modules)
  File "/home/brajesh/.local/lib/python3.5/site-packages/eventlet/patcher.py", 
line 126, in import_patched
    *additional_modules + tuple(kw_additional_modules.items()))
  File "/home/brajesh/.local/lib/python3.5/site-packages/eventlet/patcher.py", 
line 100, in inject
    module = __import__(module_name, {}, {}, module_name.split('.')[:-1])
  File "/home/brajesh/.local/lib/python3.5/site-packages/dns/asyncbackend.py", 
line 41
    raise NotImplementedError(f'unimplemented async backend {name}')
                                                                  ^
--
Thanks & Regards
Brajesh Kumar Umrao,
Research Scholar,
CSED, MNNIT Allahabad, Allahabad (U.P.)
Mo.: +91 988 9639 175


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