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[Bug 1891298] [NEW] volume_size in bdms cannot work when instance boot with snapshot image

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: renminmin <1891298@xxxxxxxxxxxxxxxxxx>
Date: Wed, 12 Aug 2020 09:52:43 -0000
Reply-to: Bug 1891298 <1891298@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

In my env, cinder volume backend is ceph rbd.

# Original instance boot with volume-backend from the image01

$ nova boot --block-device
source=image,id=$image01,dest=volume,size=50,shutdown=remove,bootindex=0
--flavor m1.tiny --nic net-id=$net vm01

# create instance image

$ nova image-create vm01 img-vm04
$ glance image-show img-vm04

+----------------------------------+----------------------------------------------------------------------------------+
| Property                         | Value                                                                            |
+----------------------------------+----------------------------------------------------------------------------------+
| base_image_ref                   |                                                                                  |
| bdm_v2                           | True                                                                             |
| block_device_mapping             | [{"image_id": null, "volume_type": null, "boot_index": 0, "snapshot_id":         |
|                                  | "42fea563-9551-4bc3-b3fb-7746e0895158", "destination_type": "volume", "tag":     |
|                                  | null, "source_type": "snapshot", "device_type": "disk", "guest_format": null,    |
|                                  | "device_name": "/dev/vda", "no_device": null, "delete_on_termination": true,     |
|                                  | "volume_size": 100, "disk_bus": "virtio", "volume_id": null}]                    |
| boot_roles                       | reader,admin,member                                                              |
| checksum                         | d41d8cd98f00b204e9800998ecf8427e                                                 |
| container_format                 | bare                                                                             |
| created_at                       | 2020-08-11T08:49:32Z                                                             |
| direct_url                       | rbd://b7b2fac6-420f-4ec1-aea2-4862d29b4059/volumes/f11d2516-ba1a-4994-b984-d253d |
|                                  | 1524dab/snap                                                                     |
| disk_format                      | qcow2                                                                            |
| hw_rng_model                     | virtio                                                                           |
| id                               | f11d2516-ba1a-4994-b984-d253d1524dab                                             |
| locations                        | [{"url": "rbd://b7b2fac6-420f-4ec1-aea2-4862d29b4059/volumes/f11d2516-ba1a-4994- |
|                                  | b984-d253d1524dab/snap", "metadata": {"store": "ceph"}}]                         |
| min_disk                         | 1                                                             


# Boot new instance with img-vm04

nova boot --block-device
source=image,id=$img04,dest=volume,size=200,shutdown=remove,bootindex=0
--flavor m1.tiny --nic net-id=$net vm05

# root volume size is 50
3ea44251-04cd-4d6c-865d-b868b5faddc4 | in-use    |      | 50  | ceph-rbd    | true     | e21fd39b-ab72-42d1-91d6-f9462685bba8 |

Excepted: volume size is 200

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1891298

Title:
  volume_size in bdms cannot work when instance boot with snapshot image

Status in OpenStack Compute (nova):
  New

Bug description:
  In my env, cinder volume backend is ceph rbd.

  # Original instance boot with volume-backend from the image01

  $ nova boot --block-device
  source=image,id=$image01,dest=volume,size=50,shutdown=remove,bootindex=0
  --flavor m1.tiny --nic net-id=$net vm01

  # create instance image

  $ nova image-create vm01 img-vm04
  $ glance image-show img-vm04

  +----------------------------------+----------------------------------------------------------------------------------+
  | Property                         | Value                                                                            |
  +----------------------------------+----------------------------------------------------------------------------------+
  | base_image_ref                   |                                                                                  |
  | bdm_v2                           | True                                                                             |
  | block_device_mapping             | [{"image_id": null, "volume_type": null, "boot_index": 0, "snapshot_id":         |
  |                                  | "42fea563-9551-4bc3-b3fb-7746e0895158", "destination_type": "volume", "tag":     |
  |                                  | null, "source_type": "snapshot", "device_type": "disk", "guest_format": null,    |
  |                                  | "device_name": "/dev/vda", "no_device": null, "delete_on_termination": true,     |
  |                                  | "volume_size": 100, "disk_bus": "virtio", "volume_id": null}]                    |
  | boot_roles                       | reader,admin,member                                                              |
  | checksum                         | d41d8cd98f00b204e9800998ecf8427e                                                 |
  | container_format                 | bare                                                                             |
  | created_at                       | 2020-08-11T08:49:32Z                                                             |
  | direct_url                       | rbd://b7b2fac6-420f-4ec1-aea2-4862d29b4059/volumes/f11d2516-ba1a-4994-b984-d253d |
  |                                  | 1524dab/snap                                                                     |
  | disk_format                      | qcow2                                                                            |
  | hw_rng_model                     | virtio                                                                           |
  | id                               | f11d2516-ba1a-4994-b984-d253d1524dab                                             |
  | locations                        | [{"url": "rbd://b7b2fac6-420f-4ec1-aea2-4862d29b4059/volumes/f11d2516-ba1a-4994- |
  |                                  | b984-d253d1524dab/snap", "metadata": {"store": "ceph"}}]                         |
  | min_disk                         | 1                                                             

  
  # Boot new instance with img-vm04

  nova boot --block-device
  source=image,id=$img04,dest=volume,size=200,shutdown=remove,bootindex=0
  --flavor m1.tiny --nic net-id=$net vm05

  # root volume size is 50
  3ea44251-04cd-4d6c-865d-b868b5faddc4 | in-use    |      | 50  | ceph-rbd    | true     | e21fd39b-ab72-42d1-91d6-f9462685bba8 |

  Excepted: volume size is 200

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