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

[Michal Privoznik]

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.

Michal