EduCloud

h1. Ryu

h2. About

* Network opearting system

* OVS, openflow switch

* python

* www.osrg.net/ryu

h2. Network management applications on top of Ryu (inside a controller node)

* GRE tunneling

* VLAN support

* topology discovery

* MAC based segregation

'Only commodity hardware'

h2. Ryu <--> OpenStack

* Flat networks regardless of the underlying physical network

* Scalable multi-tenant isolations

** tunneling based isolations

** VLAN does not scale larger than 4096

** do not need high-end switches

* Future items:

** integration with quantum IPAM and L3 API

** firewall

** virtual network <--> physical network

** distributed controllers (redundancy)

Quantum plugin for each network technology

h2. Communication

'nova requests quantum-server for network configuragion'

OVS <--> Ryu: openflow

Ryu agent <--> Ryu: REST API

Quantum server <--> Ryu: REST API

Ryu agent <--> Quantum db: db access

VIF driver <--> quantum: Quantum API

linux_net driver <--> server: Quantum API

h2. Network Creation (network-node = nova-network + linux_net driver + OVS)

# to nova-network: create netork

# nova network --> quantum server: create net

# quantum server --> Ryu: network <uuid>, <tunnel key>

# quantum server --> nova network: <uuid>

# nova network --> linux_net driver: plug

# linux_net driver --> OVS: create gw-xxx

# linux_net driver --> quantum server: tentant id, network id, dp id, port, mac

# quantum server --> Ryu: network id, dp id, port, mac

# ryu --> OVS:  set flow entryies

h2. Instance creation (compute-node = nova compute + VIF driver + OVS)

# to nova compute: create instance

# nova compute --> quantum server: create port

# quantum server --> nova compute: uuid

# nova compute --> VIF driver: plug

# VIF driver --> OVS: create tap-xxx

# VIF driver --> quantum server: (tenant_id, dp_id, port, mac)

# quantum server --> Ryu: (network_id, dp_id, port, mac)

# Ryu --> OVS: set flow entryies

h2. Node boot up (compute/network-node = OVS + Ryu agent + ryu_v2.ini)

# ryu_v2.ini --> Ryu agent: get ip address

# Ryu agent -->  quantum db: register (dp_id, ip_address)

# quantum db --> Ryu agent: get list of (dp_id, ip_address, and polling)

# Ryu agent --> OVS: create vport_grc to ip address

# Ryu agent --> Ryu: register (dp_id, port_id, remote dp_id)

h2. Component: separation unit

*  interface for control and states and generates events

*  communicate by message passing

*  language independency

h2. OBS:

two ways oto isolate tenants: GRE tunnel and VLAN