Open Stack

On 3/17/2017 8:50 AM, Jay Pipes wrote:
> On 03/16/2017 10:48 PM, Masha Atakova wrote:
>> Hi everyone,
>>
>> Is there any up-to-date functionality in nova / neutron which allows to
>> run some additional code triggered by changes in instance like creating
>> or deleting an instance?
>>
>> I see that nova hooks are deprecated as of Nova 13:
>>
>> https://github.com/openstack/nova/blob/master/nova/hooks.py#L19
>>
>> While it's hard to find the reason for this deprecation, I also struggle
>> to find if there's any up-to-date alternative to those hooks.
>
> The hooks were for internal (to Nova) code triggers and made the
> behaviour of Nova potentially inconsistent between deployments, which
> limited interoperability.
>
> The way to trigger additional code running on changes to instance state
> is to listen on the outbound Nova notifications message queue topic.
>
> Listen to the notifications queue topic for instance.create[.start|end]
> and instance.delete events. You can read more about the notifications
> queue and how to set up a subscriber here:
>
> http://alesnosek.com/blog/2015/05/25/openstack-nova-notifications-subscriber/
>
>
> Best,
> -jay
>
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There is also dynamic vendordata v2 which was added in Newton:

https://docs.openstack.org/developer/nova/vendordata.html

We got feedback during the Pike PTG from some people, using hooks during 
instance create, that the dynamic vendordata serves their needs now.

If vendordata or notifications do not serve your use case, we suggest 
you explain your use case in the open so the community can try to see if 
it's something that has already been solved or is something worth 
upstreaming because it's a common problem shared by multiple deployments.

-- 

Thanks,

Matt