[Ryu-devel] [devstack] How to recover if Ryu-manager process is killed?

2014-08-01 Thread Yiyang Chang
Hi, I am now playing with devstack+Ryu-plugin. It works fine after I ran stack.sh and I saw 3 flow tables in OVS enabling GRE tunneling. But when I killed the ryu-manager process in Screen and restarted it, the OVS flow tables were gone and could not be restored. I also tried restarting q-agt

[Ryu-devel] devstack "Failure creating NET_ID" error

2014-07-24 Thread Yiyang Chang
Hi, all, I am trying to setup a devstack with Ryu plugin. I followed the instruction here https://github.com/osrg/ryu/wiki/RYU-Openstack-Havana-environment-HOWTO . I keep running into the same "Failure creating NET_ID" error, on both ubuntu 12.04 and ubuntu 14.04. Could anyone help? Thank you i

[Ryu-devel] Can OpenStack+Ryu Plugin manage an SDN based data center?

2014-07-18 Thread Yiyang Chang
Hi, all, I am recently looking into how to use Ryu plugin for OpenStack Neutron Component. I have watched a few slides presenting how Ryu-plugin plus OpenStack components plus OVS enable a multi-tenant cloud service simply using Layer 2 switching and GRE tunneling. But based on what I have see

[Ryu-devel] Does Ryu controller have a built-in state maintenance mechanism?

2014-07-10 Thread Yiyang Chang
Hi All, Here is a question about Ryu controller designing space. In the context of SDN, the network devices are stateless, and all the network states are computed and/or maintained by logically centralized controllers. My question is: does Ryu controller have a built-in mechanism to maintain

Re: [Ryu-devel] What is the best way to implement an active poll in a Ryu app?

2014-07-09 Thread Yiyang Chang
Great resources! Should put it into the Ryu documentation to let more people know it. Many Thanks! Regards, Yiyang > > To put my question simply, what is the best way to implement a > > poll-stats function in a Ryu application? > You can find example code to exactly do such: > > http://osrg.

[Ryu-devel] What is the best way to implement an active poll in a Ryu app?

2014-07-09 Thread Yiyang Chang
Hi All, To put my question simply, what is the best way to implement a poll-stats function in a Ryu application? I am now writing an OpenFlow Controller using Ryu APIs. It works perfectly when dealing with passive events triggered by OpenFlow swithces. Now I want to add a function to let the