Nova EC2 doesn't assign a floating IP to an instance being launched

[Feodor Tersin]

In EC2 classic mode AWS automatically associates a public IP address to an instance being launched. See http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-instance-addressing.html#differences

Since Nova EC2 emulates EC2 classic mode of AWS (there is no VPC support in Nova EC2), it should associate a floating IP as well. But it doesn't do this.

Though Nova has auto_assign_floating_ip parameter which does work similar AWS. But it isn't implemented for Neutron networks. And it affects both methods of running: EC2 and native Nova. Thus if we want a cloud to be AWS compatible, and we use this parameter, we change behavior of Nova in it's native part. This may be not desirable.