On 04/03/16 16:40, "gordon chung" <g...@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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