Open Stack

Hi All,

Due to a hostname change, we ended up having a new hypervisor-id for one of
our compute nodes. It was already running two instances and then, we didn't
catch the updated hypervisor-id. This ended up with new instances spawning
up with new hypervisor-id.

Now, the instances with older hypervisor-id are not seen in "virsh list",
rebooting those instances keep them rebooting.

[root (admin)]# nova hypervisor-servers compute-90
+--------------------------------------+-------------------+---------------+---------------------+
| ID                                   | Name              | Hypervisor ID
| Hypervisor Hostname |
+--------------------------------------+-------------------+---------------+---------------------+
| 9688dcef-2836-496f-8b70-099638b73096 | instance-00000712 | 40
 | compute-90.test.edu |
| f7373cd6-96a0-4643-9137-732ea5353e94 | instance-00000b74 | 40
 | compute-90.test.edu |
| c8926585-a260-45cd-b008-71df2124b364 | instance-00001270 | 92
 | compute-90.test.edu |
| a0aa3f5f-d49b-43a6-8465-e7865bb68d57 | instance-000018de | 92
 | compute-90.test.edu |
| d729f9f4-fcae-4abe-803c-e9474e533a3b | instance-000016e0 | 92
 | compute-90.test.edu |
| 30a6a05d-a170-4105-9987-07a875152907 | instance-000017e4 | 92
 | compute-90.test.edu |
| 6e0fa25b-569d-4e9e-b57d-4c182c1c23ea | instance-000018f8 | 92
 | compute-90.test.edu |
| 5964f6cc-eec3-493a-81fe-7fb616c89a8f | instance-000018fa | 92
 | compute-90.test.edu |
+--------------------------------------+-------------------+---------------+---------------------+

[root at compute-90]# virsh list
 Id    Name                           State
----------------------------------------------------
 112   instance-00001270              running
 207   instance-000018de              running
 178   instance-000016e0              running
 189   instance-000017e4              running
 325   instance-000018f8              running
 336   instance-000018fa              running

Instances not visible: instance-00000712 and instance-00000b74

Is there a way to recover from this step? I can delete the old
services(nova service-delete <id>), but I am confused whether it will lead
to loss of already running instances with old hypervisor-id? Is there a way
I can update the state of those instances to use hypervisor-id as 92
instead of 40? Kindly do let me know if you have any suggestions.

Thanks.

*Rahul Sharma*
*MS in Computer Science, 2016*
College of Computer and Information Science, Northeastern University
Mobile:  801-706-7860
Email: rahulsharmaait at gmail.com
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