Hello,

Scenario :

Deploy one or x computes with OpenStackDataPlaneNodeSet nodeset1.
Deploy one or x computes with OpenStackDataPlaneNodeSet nodeset2.

Create one or x instances (you can force them to be scheduled on computes from nodeset1 or nodeset2)

Live migrate instance from nodeset1's compute to nodeset2's compute.
Live migrate instance from nodeset2's compute to nodeset1's compute.

Actual result :

Live migrations are not working due to the following error (nova logs):

libvirt.libvirtError: Cannot recv data: Host key verification failed.: Connection reset by peer 
 
By looking at /etc/ssh/ssh_known_hosts deployed by edpm role edpm_ssh_known_hosts, this file contain only keys from computes that are in the nodesetX.
For a compute deployed with nodeset1, there is only ssh keys from nodeset1's computes. 
For a compute deployed with nodeset2, there is only ssh keys from nodeset2's computes. 

Live Migration is not working between computes from different nodeset because of this.

Expected result:

Live migrations should work between all computes.