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On Wed, Jan 15, 2014 at 1:32 PM, ZhiQiang Fan <aji.zqfan at gmail.com> wrote:

> Hi,
>
> When read Ceilometer install guide[1], the multi valued option
> notification_driver is set to two drivers, My question is that is the first
> one, which means nova.openstack.common.notifier.rpc_notifier, necessary?
> what will happen if it is removed?
>

If the rpc notifier is not configured in nova's settings, then nova will
not send notifications to the message bus and ceilometer will not have data
to record about nova resources.



> Note, it is not configured even in Nova installation, but is set in
> Ceilometer compute agent configuration part.
>

The rpc notifier isn't required for nova to operate by itself, only for the
integration with ceilometer.

Doug



>
> I already read the link of SystemUsageData[2], NotificationSystem[3], but
> still get no idea.
>
> Please help, thanks
>
> [1]
> http://docs.openstack.org/havana/install-guide/install/apt/content/ceilometer-install-nova.html<http://docs.openstack.org/havana/install-guide/install/apt/content/ceilometer-install-nova.html>
> [2] https://wiki.openstack.org/wiki/SystemUsageData
> [3] https://wiki.openstack.org/wiki/NotificationSystem
> --
> blog: zqfan.github.com
> git: github.com/zqfan
>
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