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

[Matt Riedemann]

Have you configured the "os_compute_api:servers:create:zero_disk_flavor"
policy rule like Takashi noted in comment 2? I want to be clear about
the recreate scenario on Stein - can you describe that?

I'm assuming something like, you have two flavors, flavor1 and flavor2,
both with disk=0.

1. create volume-backed server with flavor1
2. resize server with flavor2

You're saying you get an error in that case?

I know there were some changes in Stein with the resize flow and the
compute API method "_validate_flavor_image_nostatus" so maybe something
regressed there. It should be pretty simple to recreate in a functional
test so I'll try that.

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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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