Open Stack

Hi 
I have prepared a fedora 16 image and installed cloud-init in it. After adding to glance, I can instantiate a instance from that image, assign a public ip to it and can log in into the image through ssh with password. But somehow keypair is not inserted into the image so I can not log in to the instance using ssh keys. 
.ssh/authorized_key file is blank. I also want to understand that how this works i.e how a instance fetch a user key pair from server.

It is working for standard ubuntu images for OpenStack. 

Thanks
Kashif