[ovirt-users] What's going on open channel devices when migrating the Guest ?

[Vinzenz Feenstra]

> On Jan 15, 2016, at 10:08 AM, Jean-Pierre Ribeauville <jpribeauville at axway.com> wrote:
> 
> Hi,
>  
> I’m using a channel device between host and guest to exchange datas every 20 seconds.
>  
> On the Guest size , there is an open /dev/virtio file on which we read continuously what’s 
> sent by the host.
>  
> My question is the following : 
> When migrating the Guest to another host ,  and the migrating back to the first one ,  
> the Guest software doesn’t receive anymore datas from the host unless I restart the Guest software to re-open the /dev/virtio file.
>  
> Is there any way to detect in the Guest that migration has been done so we have to reopen  the file ?

Well you can look how we do it in the ovirt-guest-agent. But we’re not reopening the unix domain socket - We’re basically on read failure just rescheduling the read - That causes no problems after migrations - it just continues 

Our python code for that is here: https://github.com/oVirt/ovirt-guest-agent/blob/master/ovirt-guest-agent/VirtIoChannel.py

HTH

>  
> Any hint is welcome .
>  
> Thanks for help.
>  
>  
> J.P. Ribeauville
>  
> P: +33.(0).1.47.17.20.49
> .
> Puteaux 3 Etage 5  Bureau 4
>  
> jpribeauville at axway.com <mailto:jpribeauville at axway.com>
> http://www.axway.com <http://www.axway.com/>
>  
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