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[pandatt <guojy8993@xxxxxxx>]

Public bug reported:

1. Our production environment run with OpenStack Rocky.
2. Steps to reproduce the issue:
(1) Upload an image,e.g: CentOS7, with 10G min_disk and 1024M min_ram specified.
(2) Boot instance with flavor 1-512-5(CPU 1,RAM 512m, Disk 5G) and image CentOS7, then nova raises error telling that flavor 1-512-5 doesn't meet disk/ram requirement specified by CentOS7 image.
(3) Then try to boot instance with flavor 1-1024-10 and image CentOS7 , we'll find it's OK.
(4) Then try to resize the instance to flavor 1-512-5, we will find it's OK and flavor restriction is bypassed.

And consequence caused by this issue is obvious and critical:
In my opinion, the min_disk/min_ram options in image specification serve as a guideline to properly allocate memory/disk and run instance, an inappropriate resize can cause FS corruption and data loss.

** Affects: nova
     Importance: Undecided
     Assignee: pandatt (pandatt)
         Status: Confirmed


** Tags: flavor lower resize

** Tags added: resize

** Tags added: flavor lower

** Changed in: nova
     Assignee: (unassigned) => pandatt (pandatt)

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https://bugs.launchpad.net/bugs/1808728

Title:
  Instance is allowed to resize to a flavor with lower disk /ram size
  than that specified in source image, snapshot or backup

Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  1. Our production environment run with OpenStack Rocky.
  2. Steps to reproduce the issue:
  (1) Upload an image,e.g: CentOS7, with 10G min_disk and 1024M min_ram specified.
  (2) Boot instance with flavor 1-512-5(CPU 1,RAM 512m, Disk 5G) and image CentOS7, then nova raises error telling that flavor 1-512-5 doesn't meet disk/ram requirement specified by CentOS7 image.
  (3) Then try to boot instance with flavor 1-1024-10 and image CentOS7 , we'll find it's OK.
  (4) Then try to resize the instance to flavor 1-512-5, we will find it's OK and flavor restriction is bypassed.

  And consequence caused by this issue is obvious and critical:
  In my opinion, the min_disk/min_ram options in image specification serve as a guideline to properly allocate memory/disk and run instance, an inappropriate resize can cause FS corruption and data loss.

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