nova/releasenotes/notes/virtio-rng-by-default-9cc13...

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---
features:
- |
When using the libvirt driver, Nova instances will now get a
VirtIO-RNG (Random Number Generator) device by default. This is to
ensure guests are not starved of entropy during boot time. In case
you want to *disallow* setting an RNG device for some reason, it can
be done by setting the flavor Extra Spec property ``hw_rng:allowed``
to ``False``.