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On 04/03/16 16:40, "gordon chung" <gord at live.ca> wrote:

>> One part of the documentation set that we were missing was a guide to how to migrate from ceilometer to a ceilometer/gnocchi combination (which I understand is the ultimate architecture). We would like to migrate the historical data we have stored in ceilometer.
>>
>> The main line documentation (such as http://docs.openstack.org/liberty/config-reference/content/) does not yet contain details on the Gnocchi configuration so some people may miss this option when following the docs. The gnocchi.xyz has good content but it is not the standard configuration guides. I guess once Gnocchi is into the Big Tent then this sort of integration can occur.
>>
>> It’s early days yet so we don’t yet have the feeling for running Gnocchi at scale.
>>
>> Tim
>
>hi,
>
>there isn't an active migration path between Ceilometer's legacy 
>database to Gnocchi. it was discussed but given the limited resources we 
>have (contributors are welcomed) we just do not have the bandwidth 
>currently to build a tool to help port data over.
>
>Gnocchi is not a 1:1 replacement of Ceilometer's old API, it does not 
>capture full-fidelity of data and requires defined archive policy rules, 
>which makes a migration tool necessary. it is mainly intended to replace 
>the 'ceilometer statistics' use case of the old API.

Some aggregation for us is fine (e.g. After a week to group the data hourly, after a month, to group the data daily)

>
>we were hoping to get a reference architecture this cycle but were 
>delayed due to resources being pulled to other tasks. currently, the 
>best option is to take a look at the devstack plugins for Gnocchi[1] and 
>Ceilometer[2] (requires bash knowledge) to get an idea of how they're 
>set up to work together in the gate.
>
>as with all new things, it's recommended you test this out first, to 
>learn new API[3] and find potential bugs. you can configure the 
>Ceilometer collector to write to both existing db and Gnocchi so your 
>current usage is not interrupted.

OK, we’ll do that. We’re also working around the RDO RPMs and Puppet configuration to get that robust.

Thanks
Tim

>
>[1] https://github.com/openstack/gnocchi/blob/master/devstack/plugin.sh
>[2] https://github.com/openstack/ceilometer/blob/master/devstack/plugin.sh
>[3] http://gnocchi.xyz/rest.html
>
>cheers,
>-- 
>gord
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