nova/releasenotes/notes/default-zero-disk-flavor-to...

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---
upgrade:
- |
The defalut value for policy rule
``os_compute_api:servers:create:zero_disk_flavor`` has changed from
``rule:admin_or_owner`` to ``rule:admin_api`` which means that by default,
users without the admin role will not be allowed to create servers using
a flavor with ``disk=0`` *unless* they are creating a volume-backed server.
If you have these kinds of flavors, you may need to take action or
temporarily override the policy rule. Refer to
`bug 1739646 <https://launchpad.net/bugs/1739646>`_ for more details.