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Hi,

I am trying to configure live migration of instance backed by lvm iscsi
storage. I have done below mentioned config in nova.conf.

[libvirt]
virt_type = kvm
volume_use_multipath = True
live_migration_uri = qemu+ssh://nova@%s/system

The live migration is being failed with below logs.

2021-03-03 07:15:51.917 706290 INFO nova.compute.manager [-] [instance:
7de891d3-c712-434c-b39f-08e512e46e83] Took 6.02 seconds for
pre_live_migration on destination host kvm12-a1-khi01.
2021-03-03 07:15:52.029 706290 ERROR nova.virt.libvirt.driver [-]
[instance: 7de891d3-c712-434c-b39f-08e512e46e83] Live Migration failure:
operation failed: Failed to connect to remote libvirt URI
qemu+ssh://nova@kvm12-a1-khi01/system: Cannot recv data: Host key
verification failed.: Connection reset by peer: libvirt.libvirtError:
operation failed: Failed to connect to remote libvirt URI
qemu+ssh://nova@kvm12-a1-khi01/system: Cannot recv data: Host key
verification failed.: Connection reset by peer
2021-03-03 07:15:52.444 706290 ERROR nova.virt.libvirt.driver [-]
[instance: 7de891d3-c712-434c-b39f-08e512e46e83] Migration operation has
aborted
2021-03-03 07:15:52.489 706290 INFO nova.compute.manager [-] [instance:
7de891d3-c712-434c-b39f-08e512e46e83] Swapping old allocation on
dict_keys(['3e5679c8-165e-4c35-9de5-ef0d3af0f9d8']) held by migration
f519f768-5a62-4f17-9ac0-1cc2c814ec3a for instance
2021-03-03 07:15:55.927 706290 WARNING nova.compute.manager
[req-116cf2ef-4720-421e-9aad-75451e3deafe b95c0ad0fb9848598988b5bff99ca55b
abf41db7e6dc429086713f4b46cd3655 - default default] [instance:
7de891d3-c712-434c-b39f-08e512e46e83] Received unexpected event
network-vif-unplugged-df7666d6-add3-4638-98e1-14db30122c3f for instance
with vm_state active and task_state None.

I am able to login from host1 to host2 via ssh without password. Also I
have disabled hostkey check in ssh config of nova. (~/.ssh/config)

Host *
    StrictHostKeyChecking no
    UserKnownHostsFile=/dev/null

I am able to connect host2 from host 1 and vice versa via virsh uri.

nova at kvm10-a1-khi01:~$ virsh -c qemu+ssh://nova@kvm12-a1-khi01/system
Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
       'quit' to quit

virsh # exit

No sure where i am missing something.

- Ammad
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