Node set up: Ryu plug-in

If you use the Ryu plug-in, you must install both Open vSwitch and Ryu, in addition to the Ryu agent package:

Procedure 7.11. To set up each node for the Ryu plug-in

Install Ryu (there isn't currently an Ryu package for Ubuntu):
```
# pip install ryu
```

Install the Ryu agent and Open vSwitch packages:

# apt-get install neutron-plugin-ryu-agent openvswitch-switch python-openvswitch openvswitch-datapath-dkms

Replicate the ovs_ryu_plugin.ini and neutron.conf files created in the above step on all nodes running neutron-plugin-ryu-agent.
Restart Open vSwitch to properly load the kernel module:
```
# service openvswitch-switch restart
```

Restart the agent:

# service neutron-plugin-ryu-agent restart

All nodes running neutron-plugin-ryu-agent also require that an OVS bridge named "br-int" exists on each node. To create the bridge, run:
```
# ovs-vsctl add-br br-int
```