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Message #37658
[Bug 1369854] Re: min_disk and size information wrong when creating an instance image
** Changed in: nova
Status: Fix Committed => Fix Released
** Changed in: nova
Milestone: None => liberty-3
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https://bugs.launchpad.net/bugs/1369854
Title:
min_disk and size information wrong when creating an instance image
Status in Glance:
Confirmed
Status in OpenStack Compute (nova):
Fix Released
Bug description:
If I launch an instance from an image that has min_disk set to 2GB,
then create an image from the instance, the min_disk attribute is not
set correctly on the image (it's set to 0). Instead of being set as an
attribute, it exists as a property instead. This can cause issues when
other services rely on min_disk to make decisions about size (e.g. bug
1368600 for Horizon, not sure if Cinder is affected too).
This doesn't seem to happen when creating a basic instance from an
instance, only when there is also a volume involved.
I'm not sure if this is a nova or glance issue so I'm opening a task
on both for now.
Steps to reproduce
------------------------
(done on a recent devstack)
1. Create a new image with e.g. min_disk 2GB
$ glance image-create --name mindisk2gb --disk-format qcow2 --container-format bare --location https://launchpad.net/cirros/trunk/0.3.0/+download/cirros-0.3.0-i386-disk.img --min-disk 2
+------------------+--------------------------------------+
| Property | Value |
+------------------+--------------------------------------+
| checksum | None |
| container_format | bare |
| created_at | 2014-09-16T12:35:33 |
| deleted | False |
| deleted_at | None |
| disk_format | qcow2 |
| id | 9bbed3a5-00bf-4901-855e-556ca02e7fb7 |
| is_public | False |
| min_disk | 2 | <-- min_disk set as expected
| min_ram | 0 |
| name | mindisk2gb |
| owner | eb6acc49df4b4390a99c722ded526284 |
| protected | False |
| size | 9159168 | <-- size looks ok
| status | active |
| updated_at | 2014-09-16T12:35:37 |
| virtual_size | None |
+------------------+--------------------------------------+
2. Boot an instance from this image, backed by a volume (I believe this matches what happens when launching with "Image (creates a new volume)" in Horizon)
$ nova boot --flavor 4115a835-04f0-4457-b93c-1817bc44812c --block-device device='/dev/vda',source='image',dest='volume',id='9bbed3a5-00bf-4901-855e-556ca02e7fb7',size=2,bootindex=0 my_instance
+--------------------------------------+--------------------------------------------------+
| Property | Value |
+--------------------------------------+--------------------------------------------------+
| OS-DCF:diskConfig | MANUAL |
| OS-EXT-AZ:availability_zone | nova |
| OS-EXT-STS:power_state | 0 |
| OS-EXT-STS:task_state | - |
| OS-EXT-STS:vm_state | building |
| OS-SRV-USG:launched_at | - |
| OS-SRV-USG:terminated_at | - |
| accessIPv4 | |
| accessIPv6 | |
| adminPass | Uo2DL64GaY74 |
| config_drive | |
| created | 2014-09-16T12:55:30Z |
| flavor | m1.lowmem (4115a835-04f0-4457-b93c-1817bc44812c) |
| hostId | |
| id | 3e70fd2e-1dc6-4001-941e-9496a9514882 |
| image | Attempt to boot from volume - no image supplied |
| key_name | - |
| metadata | {} |
| name | my_instance |
| os-extended-volumes:volumes_attached | [] |
| progress | 0 |
| security_groups | default |
| status | BUILD |
| tenant_id | eb6acc49df4b4390a99c722ded526284 |
| updated | 2014-09-16T12:55:31Z |
| user_id | 437279436240498faca4f7bfd0fdc78a |
+--------------------------------------+--------------------------------------------------+
3. Create a snapshot
$ nova image-create 3e70fd2e-1dc6-4001-941e-9496a9514882 my_instance_snap
4. Find the snapshot in glance image-list and look at the details:
$ glance image-show d44f7368-5b91-4291-b1f4-e9386fbbbe93
+---------------------------------+----------------------------------------------------------------------------------+
| Property | Value |
+---------------------------------+----------------------------------------------------------------------------------+
| Property 'bdm_v2' | True |
| Property 'block_device_mapping' | [{"guest_format": null, "boot_index": 0, "no_device": null, "snapshot_id": |
| | "bce8f300-e21f-47c9-a015-3dfee2f35745", "delete_on_termination": null, |
| | "disk_bus": "virtio", "image_id": null, "source_type": "snapshot", |
| | "device_type": "disk", "volume_id": null, "destination_type": "volume", |
| | "volume_size": null}] |
| Property 'container_format' | bare |
| Property 'disk_format' | qcow2 |
| Property 'image_id' | 9bbed3a5-00bf-4901-855e-556ca02e7fb7 |
| Property 'image_name' | mindisk2gb |
| Property 'min_disk' | 2 | <-- min_disk is set as a property
| Property 'min_ram' | 0 |
| Property 'root_device_name' | /dev/vda |
| Property 'size' | 9159168 | <-- the size appears correct in the properties
| created_at | 2014-09-16T12:57:25 |
| deleted | False |
| id | d44f7368-5b91-4291-b1f4-e9386fbbbe93 |
| is_public | False |
| min_disk | 0 | <-- min_disk is 0
| min_ram | 0 |
| name | my_instance_snap |
| owner | eb6acc49df4b4390a99c722ded526284 |
| protected | False |
| size | 0 | <-- size is set to 0 too
| status | active |
| updated_at | 2014-09-16T12:57:25 |
+---------------------------------+----------------------------------------------------------------------------------+
Chatting with someone on the Glance team this doesn't seem to be the
expected behaviour? I would expect the size and min_disk attribute to
be correct and similar to the properties, in this case.
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References
