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---
features:
- |
The 2.37 microversion adds support for automatic allocation of network
resources for a project when ``networks: auto`` is specified in a server
create request. If the project does not have any networks available to it
and the ``auto-allocated-topology`` API is available in the Neutron
networking service, Nova will call that API to allocate resources for the
project. There is some setup required in the deployment for the
``auto-allocated-topology`` API to work in Neutron. See the
`Additional features`_ section of the OpenStack Networking Guide
for more details for setting up this feature in Neutron.
.. note:: The API does not default to 'auto'. However, python-novaclient
will default to passing 'auto' for this microversion if no specific
network values are provided to the CLI.
.. note:: This feature is not available until all of the compute services
in the deployment are running Newton code. This is to avoid sending a
server create request to a Mitaka compute that can not understand a
network ID of 'auto' or 'none'. If this is the case, the API will treat
the request as if ``networks`` was not in the server create request body.
Once all computes are upgraded to Newton, a restart of the nova-api
service will be required to use this new feature.
.. _Additional features: http://docs.openstack.org/networking-guide/intro-os-networking-features.html
upgrade:
- |
The 2.37 microversion enforces the following:
* ``networks`` is required in the server create request body for the API.
Specifying ``networks: auto`` is similar to not requesting specific
networks when creating a server before 2.37.
* The ``uuid`` field in the ``networks`` object of a server create request
is now required to be in UUID format, it cannot be a random string. More
specifically, the API used to support a nic uuid with a "br-" prefix but
that is a legacy artifact which is no longer supported.
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