Live migrate between Xenial and Trusty fails

Community Support
1

Hi,

I’m in the process of upgrading our cluster from Ubuntu Trusty to Xenial.
I can live migrate vm instances from Trusty to Xenial, but not the other way around.
This is the information I get when I try to live migrate a node from Xenial to Trusty.

Tue Jul 18 12:01:00 2017 [Z0][VM][I]: New LCM state is MIGRATE
Tue Jul 18 12:01:04 2017 [Z0][VMM][I]: Successfully execute transfer manager driver operation: tm_premigrate.
Tue Jul 18 12:01:04 2017 [Z0][VMM][I]: ExitCode: 0
Tue Jul 18 12:01:04 2017 [Z0][VMM][I]: Successfully execute network driver operation: pre.
Tue Jul 18 12:01:10 2017 [Z0][VMM][I]: Command execution fail: cat << EOT | /var/lib/one/vmm/kvm/migrate 'one-473' 'vm07' 'vm09' 473 vm09
Tue Jul 18 12:01:10 2017 [Z0][VMM][E]: migrate: Command "virsh --connect qemu:///system migrate --live  one-473 qemu+ssh://vm07/system" failed: error: Unable to read from monitor: Connection reset by peer
Tue Jul 18 12:01:10 2017 [Z0][VMM][E]: Could not migrate one-473 to vm07
Tue Jul 18 12:01:10 2017 [Z0][VMM][I]: ExitCode: 1
Tue Jul 18 12:01:10 2017 [Z0][VMM][I]: Successfully execute transfer manager driver operation: tm_failmigrate.
Tue Jul 18 12:01:10 2017 [Z0][VMM][I]: Failed to execute virtualization driver operation: migrate.
Tue Jul 18 12:01:10 2017 [Z0][VMM][E]: Error live migrating VM: Could not migrate one-473 to vm07
Tue Jul 18 12:01:11 2017 [Z0][VM][I]: New LCM state is RUNNING
Tue Jul 18 12:01:16 2017 [Z0][LCM][I]: Fail to live migrate VM. Assuming that the VM is still RUNNING (will poll VM).

Any idea on what could be wrong or how I can dig up more info?

2

Hi,

It is possible the machine type on the “newer” KVM to be unknown to the “older” one.

check what is the machine type on the running VM and what are the available types

virsh dumpxml $DOMAIN | grep ‘machine=’

/usr/libexec/qemu-kvm --machine help

On the second command you should figure out what is the “canonical” path and name of the binary though.

Best Regards,
Anton Todorov

3

Well, in this example this is a machine that i live migrated from the trusty host to the xenial host. I still can’t migrate it back to a trusty host.
So it should be exactly the same type.

# virsh dumpxml 14 |grep "machine="
    <type arch='x86_64' machine='pc-i440fx-trusty'>hvm</type>

# /usr/bin/qemu-system-x86_64 --machine help
Supported machines are:
ubuntu               Ubuntu 16.04 PC (i440FX + PIIX, 1996) (alias of pc-i440fx-xenial)
pc-i440fx-xenial     Ubuntu 16.04 PC (i440FX + PIIX, 1996) (default)
pc-i440fx-wily       Ubuntu 15.04 PC (i440FX + PIIX, 1996)
pc-i440fx-vivid      Ubuntu 15.04 PC (i440FX + PIIX, 1996)
pc-i440fx-utopic     Ubuntu 14.10 PC (i440FX + PIIX, 1996)
pc-i440fx-trusty     Ubuntu 14.04 PC (i440FX + PIIX, 1996)
pc                   Standard PC (i440FX + PIIX, 1996) (alias of pc-i440fx-2.5)
pc-i440fx-2.5        Standard PC (i440FX + PIIX, 1996)
pc-i440fx-2.4        Standard PC (i440FX + PIIX, 1996)
pc-i440fx-2.3        Standard PC (i440FX + PIIX, 1996)
pc-i440fx-2.2        Standard PC (i440FX + PIIX, 1996)
pc-i440fx-2.1        Standard PC (i440FX + PIIX, 1996)
pc-i440fx-2.0        Standard PC (i440FX + PIIX, 1996)
pc-i440fx-1.7        Standard PC (i440FX + PIIX, 1996)
pc-i440fx-1.6        Standard PC (i440FX + PIIX, 1996)
pc-i440fx-1.5        Standard PC (i440FX + PIIX, 1996)
pc-i440fx-1.4        Standard PC (i440FX + PIIX, 1996)
pc-1.3               Standard PC (i440FX + PIIX, 1996)
pc-1.2               Standard PC (i440FX + PIIX, 1996)
pc-1.1               Standard PC (i440FX + PIIX, 1996)
pc-1.0               Standard PC (i440FX + PIIX, 1996)
pc-0.15              Standard PC (i440FX + PIIX, 1996)
pc-0.14              Standard PC (i440FX + PIIX, 1996)
pc-0.13              Standard PC (i440FX + PIIX, 1996)
pc-0.12              Standard PC (i440FX + PIIX, 1996)
pc-0.11              Standard PC (i440FX + PIIX, 1996)
pc-0.10              Standard PC (i440FX + PIIX, 1996)
pc-q35-xenial        Ubuntu 16.04 PC (Q35 + ICH9, 2009)
q35                  Standard PC (Q35 + ICH9, 2009) (alias of pc-q35-2.5)
pc-q35-2.5           Standard PC (Q35 + ICH9, 2009)
pc-q35-2.4           Standard PC (Q35 + ICH9, 2009)
pc-q35-2.3           Standard PC (Q35 + ICH9, 2009)
pc-q35-2.2           Standard PC (Q35 + ICH9, 2009)
pc-q35-2.1           Standard PC (Q35 + ICH9, 2009)
pc-q35-2.0           Standard PC (Q35 + ICH9, 2009)
pc-q35-1.7           Standard PC (Q35 + ICH9, 2009)
pc-q35-1.6           Standard PC (Q35 + ICH9, 2009)
pc-q35-1.5           Standard PC (Q35 + ICH9, 2009)
pc-q35-1.4           Standard PC (Q35 + ICH9, 2009)
isapc                ISA-only PC
none                 empty machine
xenfv                Xen Fully-virtualized PC
xenpv                Xen Para-virtualized PC