[Bug 1837054] Re: Only volume-backed servers are allowed for flavors with zero disk.

[Matt Riedemann]

OK I think https://review.opendev.org/#/c/620706/ is the regression
because of this:

https://review.opendev.org/#/c/620706/32/nova/compute/api.py@3598

The resize flow passes root_bdm=None to _validate_flavor_image_nostatus
which makes it take this else block:

https://review.opendev.org/#/c/620706/32/nova/compute/api.py@585

and then we fail here:

https://review.opendev.org/#/c/620706/32/nova/compute/api.py@642

When https://review.opendev.org/#/c/561284/ was written that validation
code wasn't called during resize.

That code had introduced regression bug 1825020 which was fixed in Stein
here:

https://review.opendev.org/#/c/656666/

It looks like that should fix your problem and is in the 19.0.1 release.
Which release are you using for Stein?

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https://bugs.launchpad.net/bugs/1837054

Title:
  Only volume-backed servers are allowed for flavors with zero disk.

Status in OpenStack Compute (nova):
  New
Status in nova package in Ubuntu:
  New

Bug description:
  Hello,

  we upgraded to latest OpenStack release from queens to stein. After
  the upgrade we expect some problem with resize of instances. We use
  only volume-backed instances based on cinder-ceph. If we want to
  resize the instance we encounter: Only volume-backed servers are
  allowed for flavors with zero disk. (HTTP 403)

  All our Flavors have 0 disk and the resize worked in queens. Do we
  miss something here?

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