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Re: [libvirt] [PATCH] openvz: swap <source bridge=...> with <target dev=...>



On Wed, Oct 01, 2008 at 10:33:49AM +0400, Anton Protopopov wrote:
> 2008/9/30 Daniel P. Berrange <berrange redhat com>
> 
> > On Tue, Sep 30, 2008 at 05:57:20PM +0400, Anton Protopopov wrote:
> > >
> > > Now openvz driver chooses not interface name in host, but interface name
> > in
> > > container.
> >
> > The interface name inside the container is not something that is expressed
> > in the libvirt XML. That is left upto the guest OS to decide, and not
> > something libvirt needs to care about.
> 
> 
> In OpenVZ case you _must_ to decide what name the
> interface will have inside the container. The command line for ading an
> interface in OpenVZ looks like
>   # vzctl set $veid --ifname_add ifname[mac, host_ifname, host_mac]
> The only mandatory field is the name of _container interface_

If openvz kernel requries specification of a NIC name for inside the
container, then this is an implemntation detail that the libvirt
OpenVZ driver will have to deal with. It can auto-assign them to be
eth0, eth1, etc. This is not exposed in the libvirt XML though, since
it is not relevant to the host admin, only apps inside the guest.

> * absolutely ignore the <target dev=".."> in openvz XML description

As I said before this needs to reflect the name of the interface on
the host side. It can be ignored when creating a guest, since for the
majority of uses cases it can be safely auto-generated. It must be 
filled in when dumping XML for a guest, so the host admin knows which
NIC in the host corresponds to the guest.

Daniel
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