[Bug 1624997] Re: live-migration fails because of " Host key verification failed"

[KC]

Below configurations have been used to work around the problem:

	1. Edit /etc/nova/nova.conf on nova nodes which participate in the live migration:
	
	[libvirt]
	rbd_user =
	rbd_secret_uuid =
	#live_migration_uri = qemu+ssh://%s/system
	live_migration_uri = qemu+tcp://%s/system
	
	
	# Disable tunnelled migration so that selective
	# live block migration can be supported.
	live_migration_tunnelled = True
	
	iscsi_use_multipath = True
	
	2. Edit /etc/libvirt/libvirtd.conf:
	listen_tcp = 1
	listen_addr = "0.0.0.0"
	auth_tcp = "none"
	
	3. Restart nova-compute and libvirt:
	# service libvirt-bin restart
	# service nova-compute restart

Meanwhile, such modifications won't work if you are using Ubuntu with
kernel 3.x like 3.13.0-100-generic I previously used - it seems there is
a kernel bug underground. Latest kernel 4.4.0-45-generic work well with
above mentioned configurations.

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https://bugs.launchpad.net/bugs/1624997

Title:
  live-migration fails because of " Host key verification failed"

Status in nova package in Ubuntu:
  Confirmed

Bug description:
  OpenStack Mitaka deployed through Autopilot by following
  http://www.ubuntu.com/download/cloud

  While migrate an instance between two nova-compute nodes, below error
  will be captured log:

  2016-09-19 05:50:37.767 5987 ERROR nova.virt.libvirt.driver [req-1a482106-cd47-484a-bf1e-5e1c96dc2009 3473024639d04768a780d4e3b0d92438 72a68c40f9aa4a8b87100824ea708c2a - - -] [instance: 2f145635-bb76-4554-8385-861eb4fc849b] Live Migration failure: operation failed: Failed to connect to remote libvirt URI qemu+ssh://CA29/system: Cannot recv data: Host key verification failed.: Connection reset by peer
  2016-09-19 05:50:37.768 5987 DEBUG nova.virt.libvirt.driver [req-1a482106-cd47-484a-bf1e-5e1c96dc2009 3473024639d04768a780d4e3b0d92438 72a68c40f9aa4a8b87100824ea708c2a - - -] [instance: 2f145635-bb76-4554-8385-861eb4fc849b] Migration operation thread notification thread_finished /usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py:6530
  2016-09-19 05:50:37.777 5987 DEBUG nova.virt.libvirt.driver [req-1a482106-cd47-484a-bf1e-5e1c96dc2009 3473024639d04768a780d4e3b0d92438 72a68c40f9aa4a8b87100824ea708c2a - - -] [instance: 2f145635-bb76-4554-8385-861eb4fc849b] VM running on src, migration failed _live_migration_monitor /usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py:6319
  2016-09-19 05:50:37.778 5987 DEBUG nova.virt.libvirt.driver [req-1a482106-cd47-484a-bf1e-5e1c96dc2009 3473024639d04768a780d4e3b0d92438 72a68c40f9aa4a8b87100824ea708c2a - - -] [instance: 2f145635-bb76-4554-8385-861eb4fc849b] Fixed incorrect job type to be 4 _live_migration_monitor /usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py:6339
  2016-09-19 05:50:37.779 5987 ERROR nova.virt.libvirt.driver [req-1a482106-cd47-484a-bf1e-5e1c96dc2009 3473024639d04768a780d4e3b0d92438 72a68c40f9aa4a8b87100824ea708c2a - - -] [instance: 2f145635-bb76-4554-8385-861eb4fc849b] Migration operation has aborted
  2016-09-19 05:51:07.633 5987 DEBUG nova.virt.libvirt.driver [req-1a482106-cd47-484a-bf1e-5e1c96dc2009 3473024639d04768a780d4e3b0d92438 72a68c40f9aa4a8b87100824ea708c2a - - -] [instance: 2f145635-bb76-4554-8385-861eb4fc849b] Live migration monitoring is all done _live_migration /usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py:6550

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