libvirt users - Mar 2020 - Re: Question about local migration between containers

Hello

On kubevirt project we are using IpV6 Kind cluster,
and trying to support migration,

but since both of the containers are on the same host
we get this error

{"component":"virt-launcher","level":"error","msg":"internal
error: Attempt
to migrate guest to the same host
32323136-3731-4247-3831-303946353338","pos":"virNetClientProgramDispatchError:172","subcomponent":"libvirt","thread":"44",
"timestamp":"2020-03-25T10:41:12.123000Z"}

Is there a way to work around this please ?

it comes of course from
https://github.com/libvirt/libvirt/blob/master/src/qemu/qemu_migration_cookie.c#L1254

(not sure what version of libvirt i have but it shows the uuid so i guess
this is the one)

Thanks

On Thu, Mar 26, 2020 at 04:47:50PM +0200, Or Shoval
wrote:
> Hello
> 
> On kubevirt project we are using IpV6 Kind cluster,
> and trying to support migration,
> 
> but since both of the containers are on the same host
> we get this error
> 
>
{"component":"virt-launcher","level":"error","msg":"internal
error: Attempt
> to migrate guest to the same host
>
32323136-3731-4247-3831-303946353338","pos":"virNetClientProgramDispatchError:172","subcomponent":"libvirt","thread":"44",
> "timestamp":"2020-03-25T10:41:12.123000Z"}
> 
> Is there a way to work around this please ?
> 
> it comes of course from
>
https://github.com/libvirt/libvirt/blob/master/src/qemu/qemu_migration_cookie.c#L1254
> 
> (not sure what version of libvirt i have but it shows the uuid so i guess
> this is the one)
The link above points to git master, which only checks the UUID. This
was released in 6.2.0

All versions of libvirt before 6.2.0, will also check the hostname for
equality.


Since you're inside a container you should be able to set an arbitrary
hostname for each container.

For the UUID, we obtain the value from SMBIOS data tables. To override
this there is a parameter in /etc/libvirt/libvirtd.conf.

Regards,
Daniel
-- 
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Hi Daniel,
thanks for the quick reply

we did try to override SMBIOS
host_uuid_source = "machine-id"

and it didn't work even that nodes have different

[root@modi01 kubevirt]# ./cluster-up/ssh.sh  kind-1.17.0-worker
root@kind-1:/# cat /etc/machine-id

[root@modi01 kubevirt]# ./cluster-up/ssh.sh  kind-1.17.0-control-plane
root@kind-1:/# cat /etc/machine-id
71ebb3fc051a48b2b45345b67bb1002b

Thanks


On Thu, Mar 26, 2020 at 5:05 PM Daniel P. Berrangé <berrange@redhat.com>
wrote:
> On Thu, Mar 26, 2020 at 04:47:50PM +0200, Or Shoval wrote:
> > Hello
> >
> > On kubevirt project we are using IpV6 Kind cluster,
> > and trying to support migration,
> >
> > but since both of the containers are on the same host
> > we get this error
> >
> >
{"component":"virt-launcher","level":"error","msg":"internal
error:
> Attempt
> > to migrate guest to the same host
> >
>
32323136-3731-4247-3831-303946353338","pos":"virNetClientProgramDispatchError:172","subcomponent":"libvirt","thread":"44",
> > "timestamp":"2020-03-25T10:41:12.123000Z"}
> >
> > Is there a way to work around this please ?
> >
> > it comes of course from
> >
>
https://github.com/libvirt/libvirt/blob/master/src/qemu/qemu_migration_cookie.c#L1254
> >
> > (not sure what version of libvirt i have but it shows the uuid so i
guess
> > this is the one)
>
> The link above points to git master, which only checks the UUID. This
> was released in 6.2.0
>
> All versions of libvirt before 6.2.0, will also check the hostname for
> equality.
>
>
> Since you're inside a container you should be able to set an arbitrary
> hostname for each container.
>
> For the UUID, we obtain the value from SMBIOS data tables. To override
> this there is a parameter in /etc/libvirt/libvirtd.conf.
>
> Regards,
> Daniel
> --
> |: https://berrange.com      -o-
> https://www.flickr.com/photos/dberrange :|
> |: https://libvirt.org         -o-
> https://fstop138.berrange.com :|
> |: https://entangle-photo.org    -o-
> https://www.instagram.com/dberrange :|
>
>