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Ryu: Network Operating System
Kazutaka Morita (NTT) Isaku Yamahata (VA Linux) 16 April, 2012 EtherPad URL: http://etherpad.openstack.org/ryu
What is Ryu?
² Open-‐sourced network operating system ³ Network operating system
® Programmatic network control interface ® Logically centralized controller for thousands of switches (OVS, openRlow switch)
³ Open source software (Apache v2) ® Fully written in Python ® Project site: http://www.osrg.net/ryu/
² Ryu plugin was merged into Quantum Essex ² Ryu stands for
³ 流 -‐ Means “Rlow” in Japanese ³ 龍 -‐ Means “Japanese dragon”, one of water gods
2 �
Overview
Administrator app app app
ovs
ovs
OpenRlow switch
OpenRlow switch
Programmatic network control interface
・ We can create applications to control network on Ryu
RESTful management API
Logically centralized controller
・ Decouples virtual networks from the physical network
・Supports OpenFlow 1.0 (including Nicira Extension)
Ryu network controllers
3 �
Goals
² De facto OSS network operating system ² High quality enough for use in large production environment ³ Code quality ³ Functionality ³ Usability
² Become the standard network controller of OpenStack (default plugin of Quantum)
4 �
What does Ryu bring to OpenStack?
² Flat L2 networks regardless of the underlying physical network
² Scalable multi-‐tenant isolations ³ Ryu provides tunneling based isolations ³ VLAN doesn’t scale larger than 4096 ³ We don’t need high-‐end switches
5 �
TODO items
² Integration with Quantum IPAM ² Firewall ² Virtual network to physical network, and vice versa ³ Convert among GRE key, VLAN tag, MPLS label, …
² Distributed controllers ³ No single point of failure ³ Datacenter-‐wide scalability
6 �
L2 isolation by using GRE tunnel
ComputeNoderyu-comp-1
ComputeNoderyu-comp-2
Compute/network
OVS
OVS
Tenant demoVM
Tenant modeVM
Tenant demoVM
Tenant modeVM
Tenant demoVM
Tenant modeVM
Tenant => GRE key
GRE tunnel
OpenFlow
ryu-allTenant demoGRE key = 3
Tenant modeGRE key = 4
L2 over L3 with GRE tunnel- Able to span over network segments (l2 segment can over multi data centers)- can coexists withConventional networktechnology
Set GRE keyDeliver packets based on GRE key
switch
En/de-cupsel packetInto/from GRE packet
Ryunw-gw
nw-gw OVS
Linux(phyisical machine)
Linux
Novacompute
Quantumagent
bridge(virbr0)
KVM
Linux
Novacompute
Quantumagent
KVM
Linux
Novacompute
Quantumagent
Ryu
Quantumserver
Novanetwork Openstack
Servers...
KVM
Ryu demo setting up
OVS OVSOVS
Qemu/KVM
ping
Linux
Qemu/KVM
ping
Linux
Qemu/KVM
ping
Linux
Qemu/KVM
ping
Linux
Qemu/KVM
ping
Linux
Qemu/KVM
ping
Linux
tapxxx
vnetNNN