Hi, Running the following allowed me to get around the problem:
$ sudo apt-get install python3-pip $ pip3 install ryu==3.30 $ python3 /usr/bin/ryu-manager l2.py loading app l2.py instantiating app l2.py of L2Switch That is, I downgraded the version of Ryu to 3.30. Does the above look like the correct approach? I then ran the example program from https://ryu.readthedocs.io/en/latest/writing_ryu_app.html that sends a received packet to all the ports: $ python3 /usr/bin/ryu-manager emz.py loading app emz.py loading app ryu.controller.ofp_handler instantiating app emz.py of L2Switch instantiating app ryu.controller.ofp_handler of OFPHandler I have four ports on the Ubuntu server connected to four of the five ports on the switch. How would I prove that packets are being sent to all the ports? I have tools such as ping, tcpdump and netcat on the Ubuntu system, and similar tools available on the Linux-based switch. Thanks in advance for any help. Regards, Ed From: Edward Zietarski Sent: 23 January 2020 14:45 To: ryu-devel@lists.sourceforge.net Subject: pkg_resources.DistributionNotFound: The 'ryu==3.30' distribution was not found and is required by the application Hi, I am new to Ryu, and trying to set up Ryu on a Ubuntu 16 system. I plan to run this against a Northbound Networks Zodiac GX switch, which I believe is OpenFlow version 1.3 using Open vSwitch. The Ubuntu 16 system is as follows: ~$ cat /etc/os-release NAME="Ubuntu" VERSION="16.04.6 LTS (Xenial Xerus)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 16.04.6 LTS" VERSION_ID="16.04" HOME_URL="http://www.ubuntu.com/"; SUPPORT_URL="http://help.ubuntu.com/"; BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"; VERSION_CODENAME=xenial UBUNTU_CODENAME=xenial The versions of Python and Ryu are as follows: $ ryu --version ryu 4.34 $ python3 -V Python 3.5.2 $ python -V Python 2.7.12 I have tried running the following example Python application copied from https://ryu.readthedocs.io/en/latest/writing_ryu_app.html $ cat l2.py from ryu.base import app_manager class L2Switch(app_manager.RyuApp): def __init__(self, *args, **kwargs): super(L2Switch, self).__init__(*args, **kwargs) The command line and output obtained is as follows: ~$ python3 /usr/bin/ryu-manager l2.py Traceback (most recent call last): File "/usr/bin/ryu-manager", line 5, in <module> from pkg_resources import load_entry_point File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2927, in <module> @_call_aside File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2913, in _call_aside f(*args, **kwargs) File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2940, in _initialize_master_working_set working_set = WorkingSet._build_master() File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 635, in _build_master ws.require(__requires__) File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 943, in require needed = self.resolve(parse_requirements(requirements)) File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 829, in resolve raise DistributionNotFound(req, requirers) pkg_resources.DistributionNotFound: The 'ryu==3.30' distribution was not found and is required by the application Are the versions of Ubuntu/Ryu/Python(3) incompatible? Do I need to upgrade or downgrade the versions? I presume that Ryu uses Python3? Note I have done both: $ sudo apt update $ sudo apt upgrade Also, is there any info available to get this up and running against the Northbound Networks Zodiac GX switch (Open vSwitch based with OpenFlow version 1.3)? Thanks in advance for any pointers. Best regards, Ed Disclaimer Semafone is a limited company, registered in England, with registered number 06963868. Our registered office is at Pannell House, Park Street, Guildford, Surrey, GU1 4HN, United Kingdom. The information contained in this communication from the sender is confidential. It is intended solely for use by the recipient and others authorized to receive it. If you are not the recipient, you are hereby notified that any disclosure, copying, distribution or taking action in relation of the contents of this information is strictly prohibited and may be unlawful. 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