openstack/glance
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Update hw_rng_model image property doc

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This property requires configuration on the Nova side for it
to have an effect; make that clear in the documentation.

Change-Id: I9a1902eefcb3a2ed1334f24a5d3335e17ab0aad2
Closes-bug: #1805679
This commit is contained in:
Brian Rosmaita 2019-06-06 09:39:46 -04:00
parent be13eb05a0
commit 90bffdc361
1 changed files with 14 additions and 2 deletions
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16
doc/source/admin/useful-image-properties.rst
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@ -50,6 +50,11 @@ Some important points to keep in mind:
<https://docs.openstack.org/nova/latest/configuration/config.html>`_
section of the Nova Configuration Guide for more information.
* Some properties recognized by Nova may have no effect unless a corresponding
property is enabled in the server flavor. For example, the ``hw_rng_model``
image property has no effect unless the Nova flavor has been configured to
have ``hw_rng:allowed`` set to True in the flavor's extra_specs.
* In a mixed hypervisor environment, the Compute Service uses the
``hypervisor_type`` image property to match images to the correct hypervisor
type.
@ -340,8 +345,12 @@ Here is a list of useful image properties and the values they expect.
- ``usbtablet``
* - libvirt API driver
- ``hw_rng_model``
- Adds a random-number generator device to the image's instances. The
cloud administrator can enable and control device behavior by
- Adds a random-number generator device to the image's instances. This
image property by itself does not guarantee that a hardware RNG will be
used; it expresses a preference that may or may not be satisfied
depending upon Nova configuration.
The cloud administrator can enable and control device behavior by
configuring the instance's flavor. By default:
* The generator device is disabled.
@ -353,6 +362,9 @@ Here is a list of useful image properties and the values they expect.
rng_dev_path=/dev/hwrng
* The use of a hardware random number generator must be configured in a
flavor's extra_specs by setting ``hw_rng:allowed`` to True in the
flavor definition.
- ``virtio``, or other supported device.
* - libvirt API driver
- ``hw_time_hpet``