[libvirt-users] question about how to set rng device on vm

[Peter Krempa]

On Thu, Oct 26, 2017 at 09:30:55 +0200, Michal Privoznik wrote:
> On 10/25/2017 03:41 PM, Yalan Zhang wrote:
> > Hi Amos,
> > 
> > I'm a libvirt QE, and I can not understand the setting on libvirt.org for
> > rng device.
> > Could you please help to explain a little?
> > (The xml in  https://libvirt.org/formatdomain.html#elementsRng)
> > <devices>
> >   <rng model='virtio'>
> >     <rate period="2000" bytes="1234"/>
> >     <backend model='random'>/dev/random</backend>
> >     <!-- OR -->
> >     <backend model='egd' type='udp'>
> >       *<source mode='bind' service='1234'/>*
> > *      <source mode='connect' host='1.2.3.4' service='1234'/>*
> >     </backend>
> >   </rng>
> > </devices>
> > 
> > How did it work with source mode='bind' and source mode='connect' together?
> 
> It doesn't. That's just an example that you can have two types of
> backend. Either the backend connects somewhere (mode='connect'), or
> expect somebody to connect (mode='bind'). Just try to define domain with
> that RNG, dump the XML back and see what got applied.

Note that both are required to establish a bidirectional connection with
UDP as configured above. For EGD you really need both directions since
it's a bidirectional protocol.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <http://listman.redhat.com/archives/libvirt-users/attachments/20171026/b8b38abf/attachment.sig>