Re: Upgrade machine type during migration
On Sat, Mar 11, 2023 at 06:35:20PM +0100, Michael Schwartzkopff wrote:
Hi,
I have an old system. The guest there is defined with:
<os>
<type arch='x86_64'
machine='pc-q35-rhel8.2.0'>hvm</type>
</os>
When I try to migrate this guest to a new system I get the error:
error: internal error: unable to execute QEMU command 'blockdev-add': Failed
to connect socket: Permission denied
On the new host I see the log entries:
libvirtd[22411]: Domain id=18 name='test02'
uuid=9bad33a8-d18e-4c68-bdbe-dad34142dc22 is tainted: deprecated-config
(machine type 'pc-q35-rhel8.2.0')
systemd-machined[9980]: New machine qemu-18-test02.
systemd[1]: Started Virtual Machine qemu-18-test02.
systemd-networkd[3914]: vnet20: Link DOWN
systemd-networkd[3914]: vnet20: Lost carrier
kernel: br1: port 3(vnet20) entered disabled state
kernel: device vnet20 left promiscuous mode
kernel: br1: port 3(vnet20) entered disabled state
systemd[1]: machine-qemu\x2d18\x2dtest02.scope: Deactivated successfully.
systemd-machined[9980]: Machine qemu-18-test02 terminated.
libvirtd[22411]: migration successfully aborted
It seems there is no possible combination of machine types that is
compatible for both hosts. The old host only can start rhel8.2 guests, the
new one only rhel9.0.
RHEL-9 is capable of running all rhel8.x machine types, so there shold
be no compatibility problems here.
The message you see about deprecation is simply a warning that continuing
to use this rhel8.2 machine type is discouraged, because you won't be
able to live migrate it onto future RHEL-10 hosts.
Is there a possibility to change the machine type during a migration?
Is
such a migration possible? Or do I have so shut down the guest?
Changing machine types during live migration is impossible as that's
a guest visible hardware change. That shouldn't matter foir your
case though, as RHEL-9 is capable fo running rhel8.2 machine types.
I'd suggeest checking the /var/log/libvirt/qemu/$GUEST.log file
for details of why it might have actually failed.
With regards,
Daniel
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