Hi Russell, Thanks a lot for the pointer. I think this will solve my problem. Sorry to trouble you more, but can you please direct me to some sample notification receiver. I know python but no nothing about this messaging system. So if you can give me a sample notification receiver I will adopt it to my needs. I see some of the information missing which is required for me. -- there is no data available about the MAC Address of the VIFs associated with instance. Even the Reference manual of API is not working for getting this data. I referred http://api.openstack.org/api-reference.html v2/{tenant_id}/servers/{server_id}/virtual_interfaces Regards, Vaibhav <blockquote> ---------- Original message ---------- From:"Russell Bryant"< rbryant@redhat.com > Date: 21 Nov 12 18:23:35 Subject: Re: [rhos-list] Hooks/plugins in Openstack NOVA To: rhos-list@redhat.com On 11/20/2012 11:23 PM, Kumar Vaibhav wrote: > Hi, > > I want to add execute some custom scripts, which make entries in my > existing > authentication/authorisation system, at the start of boot of the VM > instance. > > This script can be run on cloud nova manager(preferred) or nova compute > node. > > How to add this script in the openstack-nova? > Is there any provision of creating/defining hooks in NOVA? Nova does not have any hook support currently. However, it does have an asynchronous notifications system that could be used for this. Here is a wiki page that shows the data that comes in the notifications for creating and deleting an instance: http://wiki.openstack.org/SystemUsageData#compute.instance.create.start.2BAC8.end: To enable notifications in Folsom, you set the notification_driver in the [DEFAULT] section of nova.conf. notification_driver=nova.openstack.common.noti fier.rabbit_notifier There is also a log file based notifier, but I suspect the messaging based notifier better suits your needs. Also, while the notifier is named "rabbit_notifier", it actually applies to whatever is configured as the "rpc_backend". So, it works with Qpid, as well. -- Russell Bryant _______________________________________________ rhos-list mailing list rhos-list@redhat.com https://www.redhat.com/mailman/listinfo/rhos-list </blockquote> <div style="border-top:1px dashed #ccc; border-bottom:1px dashed #ccc; padding:5px;"><a href="http://www3.in.com/sso/commonregister.php?ref=IN&utm_source=invite&utm_medium=outgoing" style="font:13px arial; color:#1E56A1; text-decoration:none;">Get Yourself a cool, short @in.com Email ID now!</a></div>