Set fixed UUID for all disks in a VM

[RBretzel]

Hell,
I installed a K8s (Kubernetes) with several QEMU disks in an Ubuntu VM.
The challenge is that after a restart of the VM, the disks are no longer the same UUID as during installation.
This results in K8s not starting anymore.
In the config (/etc/pve/qemu-server/<VMID>.conf) I can set a single UUID. If I have understood correctly, this UUID is only set for the boot disk (ubuntu).
Is there a way to set the UUID's for all disks?
Perhaps there is a parameter that ensures that all disks are assigned the UUID they were given the first time you started them.
I am open to any solutions.

 

[LnxBil]

AFAIK, you cannot influence the disk UUID in your VM from PVE. The UUID you can set is the system UUID, not the filesystem UUID.

 

[RBretzel]

Ok, first thanks for your response
That I have understood correctly, this means that there is no option to set the scsi disks 1 to 9 (see screenshot) to always have the same UUID when booting.
It would be enough for me if the UUID would not change when booting.
In the /etc/pve/qemu-server/<VMID>.conf I can set a UUID for the boot disk (scsi0) and this is also retained when booting.

Then I will submit it as a change request.
Can someone tell me how and where I can do this?

 

[LnxBil]

That I have understood correctly, this means that there is no option to set the scsi disks 1 to 9 (see screenshot) to always have the same UUID when booting.
It would be enough for me if the UUID would not change when booting.

I don't understand what a UUID for a disk should be. Do you mean the WWN?
Could you try to explain/show what you mean that changes inside of your guest?

You can however give the disk a serial, that may be used to generate an UUID inside of the guest? You can just add it as ,serial=1234
(source)

Can someone tell me how and where I can do this?

Feature requests go to the bug tracker.

 

[fiona]

FYI, the WWN can be set via CLI, but is not exposed in the UI, e.g.

qm set 118 --scsi1 lvmthin:vm-118-disk-0,wwn=0x5566777799999999

 

[LnxBil]

FYI, the WWN can be set via CLI, but is not exposed in the UI, e.g.

qm set 118 --scsi1 lvmthin:vm-118-disk-0,wwn=0x5566777799999999

That's even better!

 

[RBretzel]

Thank you for the suggestion.
I will test it and let you know if it has solved my problem.

Regards
Rainer