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On Fri, Jul 25, 2014 at 2:03 AM, zhangtralon <ztralon at hotmail.com> wrote:

> Hi
>
> Here,there is a problem to discuss with you.
>

This sounds like a bug. We use https://bugs.launchpad.net/nova/ to track
bugs and discuss possible solutions etc.


> *Problem:* a volume may leave over when we delete an instance
>
>
>
> *Description*:Here, two scenes may cause that a volume is legacy when we
> delete instance whose task_state is block_device_mapping .The first scene
> is that using the boot volume created by image creates instance; The other
> scene is that using image create instance with a volume created through a
> image.
>
>
> *Reason:*Through analyzing, we find that the volume id is not update to
> block_device_mapping table in DB until a volume created by an image
> through setting parameters in Blocking Device Mapping v2 is attached to an
> instance completely.If we delete the instance before the volume id is not
> update to the block_device_mapping table, the problem mentioned above
> will occur.
>
>
> Although the reason of the problem is found, I want to discuss
> the solution about it with you
>
>
> Two examples to reproduce the problem on latest icehousce:
> 1. the first scene
> (1)root at devstack:~# nova list
> +----+------+--------+------------+-------------+----------+
> | ID | Name | Status | Task State | Power State | Networks |
> +----+------+--------+------------+-------------+----------+
> +----+------+--------+------------+-------------+----------+
> (2)root at devstack:~# nova boot --flavor m1.tiny --block-device id=61ebee75-
> 5883-49a3-bf85-ad6f6c29fc1b,source=image,dest=volume,device=vda,size=
> 1,shutdown=removed,bootindex=0 --nic net-id=354ba9ac-e6a7-4fd6-
> a49f-6ae18a815e95 tralon_test
> root at devstack:~# nova list
> +--------------------------------------+-------------+--------+-------
> ---------------+-------------+-------------------+
> | ID | Name | Status | Task State | Power State | Networks |
> +--------------------------------------+-------------+--------+-------
> ---------------+-------------+-------------------+
> | 57cbb39d-c93f-44eb-afda-9ce00110950d | tralon_test | BUILD |
> block_device_mapping | NOSTATE | private=10.0.0.20 |
> +--------------------------------------+-------------+--------+-------
> ---------------+-------------+-------------------+
> (3)root at devstack:~# nova delete tralon_test
> root at devstack:~# nova list
> +----+------+--------+------------+-------------+----------+
> | ID | Name | Status | Task State | Power State | Networks |
> +----+------+--------+------------+-------------+----------+
> +----+------+--------+------------+-------------+----------+
> (4) root at devstack:~# cinder list
> +--------------------------------------+-----------+------+------+----
> ---------+----------+--------------------------------------+
> | ID | Status | Name | Size | Volume Type | Bootable | Attached to |
> +--------------------------------------+-----------+------+------+----
> ---------+----------+--------------------------------------+
> | 3e5579a9-5aac-42b6-9885-441e861f6cc0 | available | None | 1 | None |
> false | |
> | a4121322-529b-4223-ac26-0f569dc7821e | available | | 1 | None | true | |
> | a7ad846b-8638-40c1-be42-f2816638a917 | in-use | | 1 | None | true |
> 57cbb39d-c93f-44eb-afda-9ce00110950d |
> +--------------------------------------+-----------+------+------+----
> ---------+----------+--------------------------------------+
> we can see that the instance 57cbb39d-c93f-44eb-afda-9ce00110950d was
> deleted while the volume still exists with the "in-use" status
>
> 2. the scend scene
>  (1)root at devstack:~# nova list
> +----+------+--------+------------+-------------+----------+
> | ID | Name | Status | Task State | Power State | Networks |
> +----+------+--------+------------+-------------+----------+
> +----+------+--------+------------+-------------+----------+
> （2）root at devstack:~# nova boot --flavor m1.tiny --image 61ebee75-5883-49a3-
> bf85-ad6f6c29fc1b --nic net-id=354ba9ac-e6a7-4fd6-a49f-6ae18a815e95
> --block-device id=61ebee75-5883-49a3-bf85-ad6f6c29fc1b,source=image,dest=
> volume,device=vdb,size=1,shutdown=removed tralon_image_instance
> root at devstack:~# nova list
> +--------------------------------------+-----------------------+------
> --+----------------------+-------------+-------------------+
> | ID | Name | Status | Task State | Power State | Networks |
> +--------------------------------------+-----------------------+------
> --+----------------------+-------------+-------------------+
> | 25bcfe84-0c3f-40d3-a917-4791e092fa06 | tralon_image_instance | BUILD |
> block_device_mapping | NOSTATE | private=10.0.0.26 |
> +--------------------------------------+-----------------------+------
> --+----------------------+-------------+-------------------+
> （3）root at devstack:~# nova delete 25bcfe84-0c3f-40d3-a917-4791e092fa06
>   ( 4 ) root at devstack:~# nova list
> +----+------+--------+------------+-------------+----------+
> | ID | Name | Status | Task State | Power State | Networks |
> +----+------+--------+------------+-------------+----------+
> +----+------+--------+------------+-------------+----------+
>  (5) root at devstack:~# cinder list
> +--------------------------------------+-----------+------+------+----
> ---------+----------+--------------------------------------+
> | ID | Status | Name | Size | Volume Type | Bootable | Attached to |
> +--------------------------------------+-----------+------+------+----
> ---------+----------+--------------------------------------+
> | 3e5579a9-5aac-42b6-9885-441e861f6cc0 | available | None | 1 | None |
> false | |
> | a7ad846b-8638-40c1-be42-f2816638a917 | in-use | | 1 | None | true |
> 57cbb39d-c93f-44eb-afda-9ce00110950d |
> | f3df0f15-6c9d-4084-8fb5-dc2826bf3eb0 | in-use | | 1 | None | true |
> 25bcfe84-0c3f-40d3-a917-4791e092fa06 |
> +--------------------------------------+-----------+------+------+----
> ---------+----------+--------------------------------------+
> so, the instance 25bcfe84-0c3f-40d3-a917-4791e092fa06 was deleted while
> the volume f3df0f15-6c9d-4084-8fb5-dc2826bf3eb0 still exists with the
> "in-use" status
>
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