Metering Network Services - VPN as a Service

https://blueprints.launchpad.net/ceilometer/+spec/ceilometer-meter-vpnaas

Problem description

Ceilometer currently has no support for metering VPN as a Service. Cloud providers/Operators have the need to monitor and meter various aspects of the Network Services. This spec deals with metering VPN as a service(VPNaaS).

Proposed change

The measurements needed for metering VPNaas are categorized into two, provider and service level. Following are the measurements targeted to be included in Ceilometer:

  • Provider level metrics:

    • Type of VPN (Openswan, Cisco etc..) - depends on flavor framework in neutron(See Dependencies)
  • Service level metrics:

    • VPN service Status
    • Number of Connections
    • Bandwidth - Needs changes to neutron VPNaaS(See Dependencies)
  • Metric Definitions:

Name Type Unit Origin
network.services.vpn g vpn p
network.services.vpn.type g vpn p
network.services.vpn.connections g connections/s p
network.services.vpn.incoming.bytes c B p
network.services.vpn.outgoing.bytes c B p

g = gauge, c = cumulative, p = pollster

  • Status is captured in an enum-style value in the sample volume, as opposed to the resource metadata, for each vpn.

The resources associated with these metrics are captured as part of resource discovery. Neutron exposes apis to capture this data which are invoke via pollsters from the ceilometer side. The notifications on neutron services side are a bit slim. As we add these notification messages to the neutron side, we will enhance the ceilometer side to capture these events through notification handlers.

For reference implemenation on neutron side, there will be an api call to retrieve stats such as connections and bandwidth.

Alternatives

None

Data model impact

None

REST API impact

None

Security impact

None

Pipeline impact

New sources need to be included in pipeline.yaml for each group of pollsters that share a discovery extension. An example below:

sources:
  - name: fw_source
    interval: 600
    meters:
      - "network.services.vpn"
    discovery:
      - "vpn"
    sinks:
      - network_services_sink

Similarly, we will have sources for connections and bandwidth.

Other end user impact

The end user should be able to interact via the existing API and CLI.

  • It would be good to expose these metrics on horizon dashboard, but that is outside the scope of this spec.

Performance/Scalability Impacts

This change should not have any major impact on performance/Scalability.

Other deployer impact

None

Developer impact

This feature should have minimal impact on developers for ongoing maintenance

Implementation

Assignee(s)

Primary assignee:
  • pkilambi
Other contributors:
  • None
Ongoing maintainer:
  • pkilambi

Work Items

  • Add neutron client APIs to query VPNaaS calls in neutron_client.py
  • Add new Pollsters and notification handlers
  • Add Unit/Integration test coverage
  • Update measurement docs

Future lifecycle

New measurements around VPNaaS and other network services will be part of the network pollsters and notifications. So ongoing maintenance will be handled by the Ceilometer team, myself included.

Dependencies

Testing

Unit and integration Tests will be added to cover the necessary neutron_client calls, pollsters and notifications.

Documentation Impact

The Measurement docs need to be updated to reflect the new meters captured from VPNaaS API and notifications.