Re: [Xen-devel] [PATCH OSSTEST v2 18/18] WIP: libvirt: migration + save/restore support.

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Dec 02, 2014 at 04:04:59PM +0000, Ian Campbell wrote:
> Note that this remains stubbed out, since making it actually work
> requires more work (i.e. I need to figure out what is involved, seem
> to need TLS and a CA etc...)
> 
> Appears to need gnutls enabling for migration, even to localhost.
> 
> NB haven't managed to get this actually working. With GNUtls enabled
> it wants a CA certificate installed:
>     error: Cannot read CA certificate '/etc/pki/CA/cacert.pem': No such file 
> or directory
> 
> Other attempts give:
>     # virsh migrate --live debian.guest.osstest xen://
>     error: Requested operation is not valid: domain 'debian.guest.osstest' is 
> already active
> 
> Also need to try tcp:// based, by bodging libvirtd.conf to turn on
> tcp.
> 

Tried this. It didn't make any difference with regard to the error
message you saw, i.e. it's the same as above.

I've also played with changing domain name and UUID (since they are what
libvirt is checking), but  it didn't work either. Error messages were
different but libvirt still refuses to migrate to localhost.

On the other hand, save and restore worked just fine. I have a patch to
implement save and restore, which is literally calling "virsh save" and
"virsh restore".

One way to move forward is to separate the concept of migration support
and save / restore support, so that we can test save / restore for
libvirt, even if we can test local migration at the moment.

Of course if we can get local migration to work that would be best.

> TODO: Ask Jim for advice...
> 

Jim, any suggestion?

Wei.

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