[libvirt-users] How libvirt interacts with dhcpd?

[Daniel.]

Thanks for the reply Laine. My problem is that dnsmasq is masking
dhcpd, xCAT uses dhcpd for PXE stuff. If dnsmasq answer DHCP requests
the PXE boot won' t work. I want to see the logs for ensuring the
dnsmasq is not masking dhcpd.

Regards,

2018-06-18 11:39 GMT-03:00 Laine Stump <laine at redhat.com>:
> On 06/18/2018 09:16 AM, Daniel. wrote:
>> Cool, thanks!! Does it have logs?
>
> Whatever dnsmasq chooses to log, and wherever it chooses to log it. (I
> actually looked once to see if there was a way of reducing the amount of
> logging, and didn't find much of anything useful.)
>
> If you were planning to learn the current IP address of a particular
> guest's interface by looking at the logs, you can instead use the virsh
> domifaddr to to that.
>
>>
>>
>> Cheers
>>
>> Em 18/06/2018 12:55 AM, "Laine Stump" <laine at redhat.com
>> <mailto:laine at redhat.com>> escreveu:
>>
>>     On 06/15/2018 06:49 PM, Daniel. wrote:
>>     > Hi everybody,
>>     >
>>     > I'm using libvirt together with xCAT, on the same host, for testing
>>     > purposes. xCAT install and manages dhcpd. How libvirt interacts with
>>     > dhcpd? And if doens't how does the dhcp server of libvirt works, plus
>>     > where I can find information on how to troubleshot it?
>>
>>     libvirt doesn't use dhcpd. It runs a separate instance of dnsmasq for
>>     each virtual network that is defined within libvirt. Each instance
>>     listens *only* on the bridge device that was created by libvirt for that
>>     network. IIfi dhcpd has an option that tells it to listen on all
>>     interfaces (or to automatically start listening on any new interface
>>     that is created), you should disable that option so that it doesn't
>>     attempt to listen for dhcp requests on the bridges created by libvirt.
>>
>>
>



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