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[heut2008 <heut2008@xxxxxxxxx>]

with nova's notification system.you can get instance action messages
ref:http://wiki.openstack.org/NotificationSystem

2012/3/26 Rogério Vinhal Nunes <rogervn@xxxxxxxxxxx>:
> Hello,
>
> I'm developing a application to work along with openstack. My application
> needs to keep track of all instances being started or terminated such as
> feeding it information about the location, status and other information
> about launched and terminated instances. The current version makes timed
> queries to OpenStack database, but this is showing to be a little consuming
> and inefficient, so I would like to add a portion of code to make OpenStack
> actively feed my application information whenever an instance changes its
> status or location.
>
> What is the least intrusive way to do that? It would be very nice if
> OpenStack provided a way to run code on these situations without actually
> changing any code, such as defining a directory of scripts to run in every
> instance status change.
>
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