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Message #96151
[Bug 2027553] Re: "Cannot access backing file, No such file or directory" error when resize instance with ephemeral disks
[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]
** Changed in: nova
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/2027553
Title:
"Cannot access backing file, No such file or directory" error when
resize instance with ephemeral disks
Status in OpenStack Compute (nova):
Expired
Bug description:
Description
===========
When we resize an instance with flavor with ephemeral disk, it finishes in error state and we have the following error : Cannot access backing file \'/var/lib/nova/instances/_base/ephemeral_30_0cf8804\' of storage file \'/var/lib/nova/instances/<instance_uuid>/disk.local.
The issue happened only when the instance has been initially created with flavor without ephemeral disk.
Steps to reproduce
==================
* Have three compute nodes
* create three "dedicated" flavors called small, medium and large. The small flavor has no ephemeral disk.
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 0 |
| access_project_ids | None |
| description | None |
| disk | 50 |
| id | xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| name | medium |
| os-flavor-access:is_public | True |
| properties | |
| ram | 1024 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 1 |
+----------------------------+--------------------------------------+
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 30 |
| access_project_ids | None |
| description | None |
| disk | 50 |
| id | xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| name | medium |
| os-flavor-access:is_public | True |
| properties | |
| ram | 2048 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 1 |
+----------------------------+--------------------------------------+
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 60 |
| access_project_ids | None |
| description | None |
| disk | 50 |
| id | xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| name | medium |
| os-flavor-access:is_public | True |
| properties | |
| ram | 4096 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 2 |
+----------------------------+--------------------------------------+
* Create the instance with flavor small
* Resize the instance with the flavor medium to the second node
* Check the folder nova_compute/_data/instances/_base on the compute
node where is the vm, you should have the ephemeral disk backing file
for the flavor medium :
ls nova_compute/_data/instances/_base/ephemeral_30_0cf8804
nova_compute/_data/instances/_base/ephemeral_30_0cf8804
* Ensure this file is not present on the another nodes.
* Resize the instance with the flavor large to the third node
* Then you will see the ERROR in nova_compute logs :
libvirt.libvirtError: Cannot access backing file
'/var/lib/nova/instances/_base/ephemeral_30_0cf8804' of storage file
'/var/lib/nova/instances/<instance_uuid>/disk.local'
Expected result
===============
VM resized successfuly, vm state is active
Actual result
=============
* VM become ERROR
* On dashboard you can see this notice:
Please try again later [Error: libvirtError].
Environment
===========
1. Exact version of OpenStack you are running.
Train version 20.6.1
The error happened also in Wallaby
2. Which hypervisor did you use?
Libvirt + KVM
3. Which storage type did you use?
local disk
4. Which networking type did you use?
Neutron with OpenVSwitch
Logs & Configs
==============
2023-07-12 07:51:14.786 7 ERROR nova.compute.manager [req-1e1376df-78f9-44b4-bdec-1841a7cb20c5 6c20cdc6afb344deb2a47ad9b55969a4 3e1174a8a8b74c02966f07c2049d1344 - default default] [instance: 01de72ff-0871
-4ae8-81cd-ef7c3eb8ddf7] Setting instance vm_state to ERROR: libvirt.libvirtError: Cannot access backing file '/var/lib/nova/instances/_base/ephemeral_30_0cf8804' of storage file '/var/lib/nova/instances/
01de72ff-0871-4ae8-81cd-ef7c3eb8ddf7/disk.local' (as uid:42436, gid:42436): No such file or directory
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References
