On 05/11/2015 5:11 AM, Raghunath D wrote:
Hi Pradeep,
Presently we are looking for a monitoring service.Using monitoring
service user's/application's
will subscribe for few notification's/events from openstack
infrastructure and monitoring service
will publish these notification to user's/application's.
We are exploring Ceilometer for this purpose.We came across below blue
print which is similar to our requirement.
https://blueprints.launchpad.net/ceilometer/+spec/declarative-notifications.
i'm not exactly clear on what you are trying to achieve. that said, the
basic premise of the above blueprint is that if serviceX (nova, neutron,
etc...) starts publishing a new notification with a metric of interest,
Ceilometer can be easily configured to capture said metric by adding a
metric definition to a definition file[1] or a custom definition
file[2]. the same can be done for events[3].
We have few queries on declarative-notifications frame work,could you
please help us in addressing them:
1.We are looking for an API for Subcribing/Publishing notification.Do
this frame work exposes any such API,if yes could you
please provide us API doc or spec how to use it.
2.If the frame work doesn't have such API,does any of the development
group is working in this area.
3.Please suggest what would be the best place in ceilometer
notification frame work(publisher/dispatcher/..)
to implement the Subscribe and Publish API.
from what is described, it seems like you'd like Ceilometer to capture a
notification and republish it rather than stored in a Ceilometer
supported storage driver (ie Gnocchi, ElasticSearch, SQL, etc...).
currently, the only way to do this is to not enable a collector service.
doing so, the Event/Sample will be published to a message queue
(default) which you can configure your service to pull from. currently,
i don't believe oslo.messaging supports pub/sub work flow.
alternatively, you can use one of the other publishers[4]. the kafka
publisher should allow you to do a pub/sub type workflow. i know RAX has
atom hopper[5] which uses atom feeds to support pub/sub functionality.
there was discussions on adding support for this but no work has been
done on it. feel free to propose it if you feel it's worthwhile.
[1]
https://github.com/openstack/ceilometer/blob/master/ceilometer/meter/data/meters.yaml
[2]
https://github.com/openstack/ceilometer/blob/master/ceilometer/meter/notifications.py#L31
[3]
https://github.com/openstack/ceilometer/blob/master/etc/ceilometer/event_definitions.yaml
[4]
http://docs.openstack.org/admin-guide-cloud/telemetry-data-retrieval.html#publishers
[5] http://atomhopper.org/
cheers,
--
gord
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