Does the libvirt has any capabilities to get the statistics of DHCP server ? How many packets received/sent ? Is there a way to get those statistics if the APIs are not available ?
Thanks & Regards Santhosh Kumar Gunturu On Thu, Apr 30, 2020 at 1:45 PM Laine Stump <la...@redhat.com> wrote: > On 4/28/20 12:01 PM, Daniel P. Berrangé wrote: > > On Tue, Apr 28, 2020 at 08:51:45AM -0700, Santhosh Kumar Gunturu wrote: > >> Okay. Thanks. > >> > >> Do we have any facility APIs to set the DHCP Options via XML ? > >> Default gateway ? > > libvirt has no supported method of specifying a default gateway other > than the IP of the bridge device on the virtualization host it self, and > DHCP clients on these networks will always end up getting their default > gateway set to the IP address of that bridge. Fortunately (for you :-) > that's not because libvirt is explicitly setting that address in the > dnsmasq config file, but just because that's what dnsmasq does when no > gateway address is specified in the config file. > > You would set this in the dnsmasq.conf file with dhcp-option, e.g.: > > dhcp-option=option-router,192.168.122.5 > > and recent libvirt (5.6.0 and newer) allows adding arbitrary lines to > the dnsmasq.conf files it creates for its networks, using the > <dnsmasq:options> element in the network XML. For details on how to do > this, look at: > > https://libvirt.org/formatnetwork.html#elementsNamespaces > > > > >> Dns-server ? > > Not exact, but > > <forwarder addr='8.8.8.8'/> > > is *kind of* what you're looking for. It doesn't set the IP address sent > back in the dhcp reply, but sets up the dnsmasq instance listening for > the network to forward all requests on to 8.8.8.8 (you can also refine > this to forward the requests for only certain domains, by adding > "domain='example.com'" to the <forwarder> element). > > (If you *really* need to have the guest send DNS requests directly to > the upstream DNS server rather than via dnsmasq, then you would need to > use <dnsmasq:options> to set something like > "dhcp-option=option-dns-server,8/8/8/8") > > >> domain-name ? > > domain can be set with "<domain name='example.com'/>". > > > > > > Everything is controlled through the XML document described here: > > > > https://libvirt.org/formatnetwork.html > > > > We don't have separate APIs for each piece of info - just the one > > virNetworkDefineXML API that takes the XML document. > > > > Regards, > > Daniel > > > >
