Live migration is not working in Red Hat OpenStack Platform 10

Issue

• Live migration is not working in Red Hat OpenStack Platform 10

The live migration starts:

compute1/var/log/nova/nova-api.log:2017-07-25 17:12:22.321 772422 DEBUG nova.compute.api [req-eab0d0dc-9c33-42ee-9e35-de52a6bcd60b c9f9ef4aea9748cabfe743d4835c2a08 75c2172567214b67aa233ed375fcd230 - default default] [instance: 51a8e533-1638-4774-8c40-67ddd27aba59] Fetching instance by UUID get /usr/lib/python2.7/site-packages/nova/compute/api.py:2213
compute1/var/log/nova/nova-api.log:2017-07-25 17:12:22.379 772422 DEBUG nova.compute.api [req-eab0d0dc-9c33-42ee-9e35-de52a6bcd60b c9f9ef4aea9748cabfe743d4835c2a08 75c2172567214b67aa233ed375fcd230 - default default] [instance: 51a8e533-1638-4774-8c40-67ddd27aba59] Going to try to live migrate instance to COMPUTE_NODE live_migrate /usr/lib/python2.7/site-packages/nova/compute/api.py:3621

But errors with a host key verification failure:

$ egrep req-eab0d0dc-9c33-42ee-9e35-de52a6bcd60b COMPUTE_NODE*/var/log/nova/* | egrep -i 'fail|warning|error'
compute2/var/log/nova/nova-compute.log:2017-07-25 17:12:25.070 495279 ERROR nova.virt.libvirt.driver [req-eab0d0dc-9c33-42ee-9e35-de52a6bcd60b c9f9ef4aea9748cabfe743d4835c2a08 75c2172567214b67aa233ed375fcd230 - - -] [instance: 51a8e533-1638-4774-8c40-67ddd27aba59] Live Migration failure: operation failed: Failed to connect to remote libvirt URI qemu+ssh://nova_migration@COMPUTE_NODE/system?keyfile=/etc/nova/migration/identity: Cannot recv data: Host key verification failed.: Connection reset by peer
compute2/var/log/nova/nova-compute.log:2017-07-25 17:12:25.082 495279 DEBUG nova.virt.libvirt.migration [req-eab0d0dc-9c33-42ee-9e35-de52a6bcd60b c9f9ef4aea9748cabfe743d4835c2a08 75c2172567214b67aa233ed375fcd230 - - -] [instance: 51a8e533-1638-4774-8c40-67ddd27aba59] VM running on src, migration failed find_job_type /usr/lib/python2.7/site-packages/nova/virt/libvirt/migration.py:225
compute2/var/log/nova/nova-compute.log:2017-07-25 17:12:25.083 495279 ERROR nova.virt.libvirt.driver [req-eab0d0dc-9c33-42ee-9e35-de52a6bcd60b c9f9ef4aea9748cabfe743d4835c2a08 75c2172567214b67aa233ed375fcd230 - - -] [instance: 51a8e533-1638-4774-8c40-67ddd27aba59] Migration operation has aborted

In nova.conf, the SSH method is being used:

$ grep uri /etc/nova/nova.conf
...
live_migration_uri=qemu+ssh://nova_migration@%s/system?keyfile=/etc/nova/migration/identity
...

And the contents of the files referenced do not have SSH keys in them:

$ cat etc/nova/migration/identity 
# SSH identity file (private key) for Openstack Nova migration
#
# Generate an ssh key pair for this host.
# Add the private key (e.g id_rsa) to this file.
# Add the public key (e.g id_rsa.pub) to /etc/nova/migration/authorized_keys
# on the migration target hosts.

$ cat etc/nova/migration/authorized_keys 
# SSH authorized_keys file for Openstack Nova migration
#
# This controls with hosts are allowed to migration VMs to this host.
# Append the SSH public keys of authorized hosts to this file.