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Hi,

I've started to work on the idea of supporting a kind of tenant/project based configuration for Ceilometer. Unfortunately I haven't reached the point of having a blueprint that could be registered until now. I do not have a deep knowledge about the collector and compute agent services, but this feature would require some deep changes for sure. Currently there are pipelines for data collection and transformation, where the counters can be specified, about which data should be collected and also the time interval for data collection and so on. These pipelines can be configured now globally in the pipeline.yaml file, which is stored right next to the Ceilometer configuration files.

In my view, we could keep the dynamic meter configuration bp with considering to extend it to dynamic configuration of Ceilometer, not just the meters and we could have a separate bp for the project based configuration of meters.

If it is ok for you, I will register the bp for this per-project tenant settings with some details, when I'm finished with the initial design of how this feature could work.

Best Regards,
Ildiko

-----Original Message-----
From: Neal, Phil [mailto:phil.neal at hp.com] 
Sent: Tuesday, January 07, 2014 11:50 PM
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [Ceilometer] Dynamic Meters in Ceilometer

For multi-node deployments, implementing something like inotify would allow administrators to push configuration changes out to multiple targets using puppet/chef/etc. and have the daemons pick it up without restart. Thumbs up to that.

As Tim Bell suggested, API-based enabling/disabling would allow users to update meters via script, but then there's the question of how to work out the global vs. per-project tenant settings...right now we collect specified meters for all available projects, and the API returns whatever data is stored minus filtered values. Maybe I'm missing something in the suggestion, but turning off collection for an individual project seems like it'd require some deep changes.

Vijay, I'll repeat dhellmann's request: do you have more detail in another doc? :-)

-	Phil

> -----Original Message-----
> From: Kodam, Vijayakumar (EXT-Tata Consultancy Ser - FI/Espoo) 
> [mailto:vijayakumar.kodam.ext at nsn.com]
> Sent: Tuesday, January 07, 2014 2:49 AM
> To: OpenStack Development Mailing List (not for usage questions)
> Cc: chmouel at enovance.com
> Subject: Re: [openstack-dev] [Ceilometer] Dynamic Meters in Ceilometer
> From: ext Chmouel Boudjnah [mailto:chmouel at enovance.com]
> Sent: Monday, January 06, 2014 2:19 PM
> To: OpenStack Development Mailing List (not for usage questions)
> Subject: Re: [openstack-dev] [Ceilometer] Dynamic Meters in Ceilometer
> 
> 
> 
> 
> 
> On Mon, Jan 6, 2014 at 12:52 PM, Kodam, Vijayakumar (EXT-Tata 
> Consultancy Ser - FI/Espoo) <vijayakumar.kodam.ext at nsn.com> wrote:
> 
> In this case, simply changing the meter properties in a configuration 
> file should be enough. There should be an inotify signal which shall 
> notify ceilometer of the changes in the config file. Then ceilometer 
> should automatically update the meters without restarting.
> 
> 
> 
> Why it cannot be something configured by the admin with inotifywait(1) 
> command?
> 
> 
> 
> Or this can be an API call for enabling/disabling meters which could 
> be more useful without having to change the config files.
> 
> 
> 
> Chmouel.
> 
> 
> 
> I haven't tried inotifywait() in this implementation. I need to check 
> if it will be useful for the current implementation.
> 
> Yes. API call could be more useful than changing the config files manually.
> 
> 
> 
> Thanks,
> 
> VijayKumar

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