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My Quantum PTL talk from the OpenStack Grizzly summit in San Diego
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OpenStack Quantum:Taking OpenStack Networking to New Heights
[email protected] Openstack Quantum Hacker & Project Team Lead
twitter - danwendlandt
Aaron Rose, Quantum core dev at Vmware, show his OpenStack Quantum team pride.
Outline• Why Quantum?• What is Quantum? – API Abstractions– Plugin Architecture
• Project Status• Deployment Scenarios• Looking Forward• Questions
Why Quantum?
Networks for Enterprise Applications are Complex….
Image from windowssecurity.com
Why Quantum? Reason #1On-demand Enterprise-Class Networking
• Quantum has Tenants API to: – create multiple private L2
networks– control IP addressing (can use
same IP space as existing datacenter deployment)
– Connect to an upstream router for external access.
– Insert advanced network services: routers, firewalls, VPN, IDS, etc.
– Monitor network status
L2
L3
L2
L2
L2
Internet
L3
L3
L3
Cloud Stresses the Network….
• High-density multi-tenancy– But VLANs limit scale
• On-demand provisioning– But traditional network solutions have interfaces designed for manual
configuration. • Need to place / move workloads were capacity exists
– But network state (e.g., IP address) is tied to a particular location
Why Quantum? #2: Leveraging Advanced Technologies
• New networking technologies are emerging to try and tackle these challenges.– Network virtualization– Overlay tunneling: VXLAN, NVGRE, STT– Software-defined Networking (SDN) /
OpenFlow– L2 Fabric solutions: FabricPath, Qfabric, etc. – [ insert other solution here ]
• Quantum provides a “plugin” mechanism to enable different technologies (more later).
What is Quantum?
Quantum Architecture
A generic tenant API to create and
configure “virtual networks”
A “plugin” architecture with different back-end
“engines”
An eco-system of tools that leverage the Quantum API.
Tenant Tools(GUI, CLI, API code)
Compute API
Network API
Storage API
Generic OpenStack APIs Operator Selected Backends
KVM
OVS Plugin
Ceph
Basic API Abstractions
Net110.0.0.0/24
VM110.0.0.2Nova
Quantum L2 virtual network
VM210.0.0.3
virtual port
virtual server
virtual interface (VIF)
“virtual networks” and “virtual subnets” are fundamentally multi-tenant, just like virtual servers (e.g., overlapping IPs can be used on different networks).
virtual subnet
Quantum Model: Dynamic Network Creation + Association
TenantA-VM110.0.0.2
TenantA-VM39.0.0.2
• Tenant can use API to create many networks.• When booting a VM, define which network(s) it
should connect to.• Can even plug-in “instances” that provide more
advanced network functionality (e.g., routing + NAT).
TenantA-VM210.0.0.3 9.0.0.3
Router
External Net88.0.0.0/18
Tenant-A Net110.0.0.0/24
Tenant-A Net29.0.0.0/24
Quantum API Extensions• Enables innovation in virtual networking.
– Tenants can query API to programmatically discover supported extensions. – Overtime, extensions implemented by many plugins can become “core”.
• Add properties on top of existing network/port abstractions:
– QoS/SLA guarantees / limits
– Security Filter Policies
– port statistics / netflow
• New Services– L3 forwarding, ACLs + NAT (“elastic” or “floating” IPs)– VPN connectivity between cloud and customer site, or another cloud datacenter.
Quantum Architecture
A generic tenant API to create and
configure “virtual networks”
A “plugin” architecture with different back-end
“engines”
An eco-system of tools that leverage the Quantum API.
Tenant Tools(GUI, CLI, API code)
Compute API
Network API
Storage API
Generic OpenStack APIs Operator Selected Backends
KVM
OVS plugin
Ceph
Tenant Scripts
Horizon GUI
Orchestration Code
API Clients Quantum Service
PluginX
Quantum API
Create-net...
Create-port
Uniform API for all clients
API Extensions
Nova Compute
virtual switch
Interfaces from Nova plug into a switch manages by
the Quantum plugin.
Physical Network
Backend X
Quantum Architecture (generic)
World’s simplest Quantum Plugin*
• API request is dumped into an email, send to your network administrator.
• Administrator manually configures network connectivity.
* Not recommended for use… ever!
• Different back-end “engines” present different trade-offs: – Scalability– Forwarding performance– Hypervisor Compatibility– Network HW Compat (vendor specific? Allow L3 scale-out?)– Manageability / troubleshooting– Advanced Features (exposed as API extensions)– Production testing– High Availability (control & data plane)– Open source vs. Free vs. Paid
• Cloud Operators weigh trade-offs, choose a plugin.
• Note: Back-end technology hidden behind logical core API – Example: VLANs vs. tunneling
Quantum Plugins Trade-offs
Quantum PluginsOpen source plugins based on Open vSwitch and Linux Bridge exist (works with any hardware switches).
The following vendors have publicly stated that they already have or are developing a Quantum plugin (others exist as well). In some cases, vendor hardware is required.
Project Status
A Growing Team…
6 Months Ago…
• Incubation release (Essex, April ‘12)– v1 API, basic L2 API abstractions. – Quantum API used by nova-network, but not
exposed to tenants.– Plugin architecture to enable choice of back-end
technology.– In production at early adopters.
Today• First “core” release (Folsom, Oct. ‘12)– v2 API, with L2 + IP address mgmt (IPAM)– Tenant API with Keystone + Horizon Integration– Updated CLI– Extensions: • L3 “routers” w/floating IPs• “provider networks” mapped to specific VLANs• Tenant quotas• Notifications
Tenant Network Control (Horizon)
Tenant Network Control (Horizon)
Tenant Network Control (Horizon)
What’s going to happen to nova-network?
• No forced upgrade in Folsom, or Grizzly.• Existing nova-network stays even with
Quantum in core. • Planning an “orderly transition”
1) Freeze on adding new functionality in nova-network (already in effect).
2) Make sure Quantum covers all important nova-network scenarios (target Grizzly)
3) Nova MAY simplifying nova-network code by removing all but basic networking support in subsequent release (possible target H-release)
Should I start using Quantum?
• Go back to reasons project was created: – API to build rich network topologies, insert
services.– Overcome limitations of traditional networking
solutions (e.g., VLANs). • If these are important to your OpenStack
deployment, go for it!• Otherwise staying with nova-network is fine.
Taking Quantum for a spin..
• Admin Documentation: – http://docs.openstack.org/trunk/openstack-netwo
rk/admin/content/
– Ubuntu and Red Hat deployments covered.– Please read the entire doc… if something is still
unclear, send email to the list• Or use Devstack– http://wiki.openstack.org/QuantumDevstack
Get Hands On!
Hands on Quantum Deployment WorkshopThursday 9:00 – 10:30 am @ Manchester E
Deployment Use Cases
Basic Physical Network Connectivity
Two API Deployment Models• Cloud Operator creates networks for tenants
– Quantum API is admin only, tenants do not use it. – Similar to nova-network model, but with flexibility around network
topology, IP addressing, etc.
• Expose API to tenants directly– True “self-service networking”.– Tenants use scripts, CLI, or web GUI to manage networks & subnets.
• Can also mix-and-match strategies– Provider creates default network connectivity, tenants can choose to
extend.
Single Flat Network
Similar to Nova-network Flat or FlatDHCP manager.
Multiple Flat Networks
Mixed Flat + Private Networks
Single Provider Router
Similar to Nova-network VlanManager.
Per-Tenant Routers
Similar to Amazon VPC or CloudStack model.
Looking Forward
Grizzly Quantum: where are we going?
• Closing gaps: – Security groups & metadata service
compatible with overlapping IPs.– Support L3-forwarding & DHCP on
compute nodes (similar to nova “multi_host” flag)
• Advanced Services– Load-balancing– VPN
Talks by Quantum Users @ Summit
Wed @ 9:30 am
Wed @ 11:00 am
Wed @ 2:40 pm
Wed @ 4:10 pm
Includes production Quantum
deployments that have been running for 6+
months on Essex!
Key Takeaways
• Quantum enables advanced networking in OpenStack: – API to configure rich network topologies. – Plugin architecture for leveraging new network
technologies. • With “core” status, expect jump in Quantum
production deployments in Folsom. • Quantum team is growing quickly, come join!
Thanks! Questions?
[email protected] Quantum Hacker & Project Team Lead
twitter - danwendlandt
Slides available at: http://www.slideshare.net/danwent
