On Tue, 2022-05-24 at 10:06 +0000, Szabo, Istvan (Agoda) wrote:
Hi,
I have a node which has been live-migrated to another node and it is running on the new node BUT there isn't any xml definition file (/etc/libvirt/qemu/instance-*.xml) of it which is automatically generated. How I solve this issue normally is to respawn that vm with the same disk and ip that it has before, but I wonder is there any easier way to just simply recreate the automatically generated definition file.
you normally would jsut regenerate the xml by hard rebooting the instance but the instace-id can change when you live migate so if you check with teh admin clint it might be presenct jsut with a differnt name. if you want stable xml path you can change the template we use to say use the instance uuid. https://docs.openstack.org/nova/latest/configuration/config.html#DEFAULT.ins... the default is "instance-%08x" i prefer to use "instance-%(uuid)s" we proably should change that default at some point. there is currently an upgrade impact to changing this but with a minor code chage we coudl actully workaroudn that we just need to store the current namein the instance_system_metadata table and only use the new default for new isntances.
The file which I'm talking about auto generated is this one: /etc/libvirt/qemu/instance-*.xml starts like this so I guess I can't create by myself.
<!-- WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE OVERWRITTEN AND LOST. Changes to this xml configuration should be made using: virsh edit instance-00006580 or other application using the libvirt API. -->
<domain type='kvm'> <name>instance-00006580</name> <uuid>ac8cf83e-6819-417a-9f83-de73c28567e9</uuid> <metadata>
....
Thank you
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