[nova][ops] Problems disabling notifications on state changes

Bal√°zs Gibizer balazs.gibizer at ericsson.com
Mon Jan 21 09:49:22 UTC 2019

On Mon, Jan 21, 2019 at 8:42 AM, Massimo Sgaravatto 
<massimo.sgaravatto at gmail.com> wrote:
> I am disabling ceilometer on my OpenStack Ocata cloud.
> As fas as I understand, besides stopping the ceilometer services, I 
> can also apply the following changes to nova.conf on the compute 
> nodes:
> instance_usage_audit = True --> false
> notify_on_state_change = vm_and_task_state --> None
> I have a problem with the latter change:
> # grep ^notify_on_state_change /etc/nova/nova.conf
> notify_on_state_change=None
> but in the nova log:
> 2019-01-21 08:31:48.246 6349 ERROR nova ConfigFileValueError: Value 
> for option notify_on_state_change is not valid: Valid values are 
> [None, vm_state, vm_and_task_state], but found 'None'
> I have also tried setting
> notify_on_state_change=<None>
> but it complains that it is not a valid value
> I can simply comment that line, but I am afraid there is a problem 
> somewhere

If you want to turn off all the notification sending from Nova, then I 
suggest to add the following [1] to the nova.conf:

    driver = noop

I verified in a devstack that if you not specify the 
notify_on_state_change attribute in the config file then it properly 
defaults to None. I think there is no way to specify the None value 
othervise in the config file.


> Thanks, Massimo

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