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diff --git a/docs/scenarios/os-odl-fdio-ha/scenario.description.rst b/docs/scenarios/os-odl-fdio-ha/scenario.description.rst new file mode 100755 index 0000000..9377879 --- /dev/null +++ b/docs/scenarios/os-odl-fdio-ha/scenario.description.rst @@ -0,0 +1,278 @@ +.. OPNFV - Open Platform for Network Function Virtualization +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 + +Scenario: "OpenStack - OpenDaylight - FD.io" +====================================================== + +Scenario: apex-os-odl-fdio-ha + +"apex-os-odl-fdio-ha" is a scenario developed as part of the +FastDataStacks OPNFV project. The main components of the +"apex-os-odl-fdio-ha" scenario are: + + - APEX (TripleO) installer (please also see APEX installer documentation) + - Openstack (in HA configuration) + - OpenDaylight controller (clustered) + controlling layer 2 and layer 3 networking + - FD.io/VPP virtual forwarder for tenant networking + +Introduction +============ + +NFV and virtualized high performance applications, such as video processing, +require a "fast data stack" solution that provides both carrier grade +forwarding performance, scalability and open extensibility, along with +functionality for realizing application policies and controlling a complex +network topology. + +A solution stack is only as good as its foundation. Key foundational assets for +NFV infrastructure are + + * The virtual forwarder: The virtual forwarder needs to be a feature rich, + high performance, highly scale virtual switch-router. It needs to leverage + hardware accelerators when available and run in user space. + In addition, it should be modular and easily extensible. + * Forwarder diversity: A solution stack should support a variety of + forwarders, hardware forwarders (physical switches and routers) + as well as software forwarders. This way virtual and physical + forwarding domains can be seamlessly glued together. + * Policy driven connectivity: Connectivity should respect and + reflect different business + +In order to meet the desired qualities of an NFV infrastructure, the +following components were chosen for the "Openstack - OpenDaylight - FD.io" +scenario: + + * FD.io Vector Packet Processor (VPP) - a highly scalable, + high performance, extensible virtual forwarder + * OpenDaylight Controller - an extensible controller platform which + offers the ability to separate business logic from networking + constructs, supports a diverse set of network devices + (virtual and physical) via the "group based policy (GBP)" + component, and can be clustered to achieve a highly available + deployment. + + +The "Openstack - OpenDaylight - FD.io" scenario provides the capability to +realize a set of use-cases relevant to the deployment of NFV nodes instantiated +by means of an Openstack orchestration system on FD.io/VPP enabled compute +nodes. The role of the Opendaylight network controller in this integration is +twofold. It provides a network device configuration and topology abstraction +via the Openstack Neutron interface, while providing the capability to realize +more complex network policies by means of Group Based Policies. Furthermore it +also provides the capabilities to monitor as well as visualize the operation of +the virtual network devices and their topologies. In supporting the general +use-case of instantiatiting an NFV instance, two specific types of network +transport use cases are realized: + + * NFV instances with VPP data-plane forwarding using a VLAN provider network + * NFV instances with VPP data-plane forwarding using a VXLAN overlay + transport network + +A deployment of the "apex-os-odl-fdio-ha" scenario consists of 6 or more +servers: + + * 1 Jumphost hosting the APEX installer - running the Undercloud + * 3 Controlhosts, which run the Overcloud as well as + 3 instances of OpenDaylight as a network controller + * 2 or more Computehosts. One of the Computehosts also serves as + layer 3 gateway for the tenant networks. + +The following picture depicts a non-HA setup of the L3 scenario. + +.. image:: FDS-odl_l3-noha-overview.png + +Tenant and public networking leverages FD.io/VPP. On one of the compute nodes, +VPP binds to both, the tenant networking interface as well as to the public +networking interface. This means that VPP is used for communication within +a tenant network, between tenant networks, as well as between a tenant network +and the Internet. Note that this setup slightly differs from the usual +centralized L3 setup with qrouter on the control node. This setup was chosen +to limit the configuration changes for the introduction of FD.io/VPP. The +OpenDaylight network controller is used to setup and manage layer 2 and +layer 3 networking for the scenario - with Group Based Policy (GBP) being the +key component. Tenant networking can either leverage VXLAN (in which case a +full mesh of VXLAN tunnels is created) or VLANs. + +The picture below shows an example setup with two compute and one control +node. Note that the external network is connected via compute node 0 through +VPP. VPP provides all layer 3 services which are provided in a "vanilla" +OpenStack deployment, including SNAT and DNAT, as well as north-south +and east-west traffic filtering for security purposes ("security groups"). + +.. image:: FDS-L3-noha-sample-setup.png + +Features of the scenario +------------------------ + +Main features of the "apex-os-odl-fdio-ha" scenario: + + * Automated installation using the APEX installer + * Fast and scalable tenant networking using FD.io/VPP as forwarder + * Layer 2 networking using VLANs or VXLAN, managed + and controlled through OpenDaylight + * Layer 3 connectivitiy for tenant networks supplied + through FD.io/VPP. Layer 3 features, including security groups as well as + floating IP addresses (i.e. NAT) are implemented by the FD.io/VPP forwarder + * Manual and automatic (via DHCP) addressing on tenant networks + * OpenStack high-availability and OpenDaylight clustered mode + +Scenario components and composition +=================================== + +The apex-os-odl-fdio-ha scenario combines components from three key open +source projects: OpenStack, OpenDaylight, and Fast Data (FD.io). The key +components that realize the apex-os-odl-fdio-ha scenario and which differ +from a regular, OVS-based scenario, are the OpenStack ML2 OpenDaylight plugin, +OpenDaylight Neutron Northbound, OpenDaylight Group Based Policy, OpenDaylight +Virtual Bridge Domain Manager, FD.io Honeycomb management agent and FD.io +Vector Packet Processor (VPP). + +Here's a more detailed list of the individual software components involved: + +**Openstack Neutron ML2 OpenDaylight Plugin**: Handles Neutron data base +synchronization and interaction with the southbound controller using a REST +interface. + +**ODL GBP Neutron Mapper**: Maps neutron elements like networks, subnets, +security groups, etc. to GBP entities: Creates policy and configuration for +tenants (endpoints, resolved policies, forwarding rules). + +**ODL GBP Neutron VPP Mapper**: Maps Neutron ports to VPP endpoints in GBP. + +**ODL GBP Location Manager**: Provides real location for endpoints (i.e. Which +physical node an endpoint is connected to). + +**GBP Renderer Manager**: Creates configuration for Renderers (like e.g. +VPP-Renderer or OVS-Renderer). The GBP Renderer Manager is the central point +for dispatching of data to specific device renderers. It uses the information +derived from the GBP end-point and its topology entries to dispatch the task +of configuration to a specific device renderer by writing a renderer policy +configuration into the registered renderer's policy store. The renderer +manager also monitors, by being a data change listener on the VPP Renderer +Policy States, for any errors in the application of a rendered configuration. + +**GBP VPP Renderer Interface Manager**: Listens to VPP endpoints in the +Config DataStore and configures associated interfaces on VPP via HoneyComb. + +**GBP VPP Renderer Renderer Policy Manager**: Manages the creation of +bridge domains using VBD and assigns interfaces to bridge domains. + +**Virtual Bridge Domain Manager (VBD)**: Creates bridge domains (i.e. in case +of VXLAN creates full mesh of VXLAN tunnels, configures split horizon on +tunnel endpoints etc.). VDB configures VXLAN tunnels always into a full-mesh +with split-horizon group forwarding applied on any domain facing tunnel +interface (i.e. forwarding behavior will be that used for VPLS). + +**Virtual Packet Processor (VPP) and Honeycomb server**: The VPP is the +accelerated data plane forwarding engine relying on vhost user interfaces +towards Virtual Machines created by the Nova Agent. The Honeycomb NETCONF +configuration server is responsible for driving the configuration of the VPP, +and collecting the operational data. + +**Nova Agent**: The Nova Agent, a sub-component of the overall Openstack +architecture, is responsible for interacting with the compute node's host +Libvirt API to drive the life-cycle of Virtual Machines. It, along with the +compute node software, are assumed to be capable of supporting vhost user +interfaces. + +The picture below shows the key components. + +.. image:: FDS-basic-components.jpg + +To provide a better understanding how the above mentioned components interact +with each other, the following diagram shows how the example of creating a +vhost-user port on VPP through Openstack Neutron: + +To create or update a port, Neutron will send a request to ODL Neutron +Northbound which contains the UUID, along with the host-id as "vpp" and +vif-type as "vhost-user". The GBP Neutron mapper turns the "Neutron speak" of +"ports" into the generic connectivity model that GroupBasedPolicy uses. +Neutron "ports" become generic "GBP Endpoints" which can be consumed by the +GBP Renderer Manager. The GBP Renderer Manager resolves the policy for the +endpoint, i.e. it determines which communication relationships apply to the +specific endpoint, and hands the resolution to a device specific renderer, +which is the VPP renderer in the given case here. VPP renderer turns the +generic policy into VPP specific configuration. Note that in case the policy +would need to be applied to a different device, e.g. an OpenVSwitch (OVS), +then an "OVS Renderer" would be used. VPP Renderer and the topology manager +("Virtual Bridge Domain" manager - i.e. VBD) cooperate to create the actual +network configuration. VPP Renderer configures the interfaces to the virtual +machines (VM), i.e. the vhost-user interface in the given case here and +attaches them to a bridge domain on VPP. VBD handles the setup of connectivity +between bridge domains on individual VPPs, i.e. it maintains the VXLAN tunnels +in the given case here. Both VPP Renderer as well as VBD communicate with the +device through Netconf/YANG. All compute and control nodes run an instance of +VPP and the VPP-configuration agent "Honeycomb". Honeycomb serves as a +Netconf/YANG server, receives the configuration commands from VBD and VPP +Renderer and drives VPP configuration using VPP's local Java APIs. + +.. image:: FDS-simple-callflow.png + +Scenario Configuration +====================== + +To enable the "apex-os-odl-fdio-ha" scenario check the appropriate +settings in the APEX configuration files. Those are typically found in +/etc/opnfv-apex. + +File "deploy_settings.yaml": Choose Opendaylight as controller with version +"carbon" and enable vpp as forwarder. "odl_routing_node" chooses the node +which is used as the layer 3 gateway for the tenant networks. +"odl_routing_node" is an optional parameter. If omitted, the VPP on the first +compute node will serve as layer 3 gateway:: + + global_params: + ha_enabled: true + + deploy_options: + sdn_controller: opendaylight + sdn_l3: true + odl_version: carbon + odl_routing_node: overcloud-novacompute-0 + tacker: true + congress: true + sfc: false + vpn: false + vpp: true + dataplane: fdio + performance: + Controller: + kernel: + hugepages: 1024 + hugepagesz: 2M + intel_iommu: 'on' + iommu: pt + isolcpus: 1,2 + vpp: + main-core: 1 + corelist-workers: 2 + uio-driver: uio_pci_generic + Compute: + kernel: + hugepagesz: 2M + hugepages: 2048 + intel_iommu: 'on' + iommu: pt + isolcpus: 1,2 + vpp: + main-core: 1 + corelist-workers: 2 + uio-driver: uio_pci_generic + +Limitations, Issues and Workarounds +=================================== + +For specific information on limitations and issues, please refer to the APEX +installer release notes. + +References +========== + + + * FastDataStacks OPNFV project wiki: https://wiki.opnfv.org/display/fds + * Fast Data (FD.io): https://fd.io/ + * FD.io Vector Packet Processor (VPP): https://wiki.fd.io/view/VPP + * OpenDaylight Controller: https://www.opendaylight.org/ + * OPNFV Danube release - more information: http://www.opnfv.org/danube |