nova/releasenotes/notes/libvirt-change-default-value-of-live-migration-tunnelled-4248cf76df605fdf.yaml

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---
upgrade:
- Default value of live_migration_tunnelled config option in
libvirt section has been changed to False. After upgrading
nova to Newton all live migrations will be non-tunnelled
unless live_migration_tunnelled is explicitly set to True.
It means that, by default, the migration traffic will not
go through libvirt and therefore will no longer be encrypted.