On 04/06/2014 08:33 AM, Johannes Kastl wrote:
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Hi everyone,
maybe this is an old fart, but I cant get it to work.
I am running libvirt on a laptop, where a dnsmasq is already running to delegate dns info for my local (not-public) network. My resolv.conf (on the host) lists the system-dnsmasq as first server.
I had to set the listen-adress for the system-dnsmasq to 127.0.0.1 and set bind-interfaces, to stop if from binding to all interfaces and overriding the libvirtd-dnsmasq, which also has dhcp enabled.
Now, how can I tell the libvirtd-dnsmasq, to use the system-dnsmasq as first nameserver?
libvirtd's dnsmasq instances always forward requests that they can't resolve themselves to the dns server listed in /etc/resolv.conf, so it should already be doing what you want. There was a bug in libvirt for quite awhile that caused locally-unresolved requests for hostnames in the domain given by the network's <domain name='xyzzy'/> element to be dropped rather than forwarded. Is that possibly the cause of your problems? Alternately, since 1.1.3 you can tell dnsmasq to forward to a specific address rather than the one listed in /etc/resolv.conf with the <forwarder> subelement of the <dns> element in the network definition, e.g.: <dns> <forwarder addr='1.2.3.4'/> </dns> This is documented here: http://www.libvirt.org/formatnetwork.html#elementsAddress There was a bug in libvirt for quite awhile that caused locally-unresolved requests for hostnames in the domain given by the network's <domain name='xyzzy'/> element to be dropped rather than forwarded. Is that possibly the cause of your problems?
I found lots of pages when searching for "libvirt dns", but all of them only show the dhcp-part of the network's xml file:
<ip address="192.168.122.1" netmask="255.255.255.0"> <dhcp> <range start="192.168.122.100" end="192.168.122.254" /> <host mac="00:16:3e:e2:ed" name="foo.example.com" ip="192.168.122.10" /> </dhcp> </ip> One possible workaround: My system-dnsmasq reads /etc/hosts_whatever, and apparently the
http://wiki.libvirt.org/page/VirtualNetworking#DNS_.26_DHCP libvirtd-dnsmasq reads var/lib/libvirt/dnsmasq/NETWORK_NAME.addnhosts. I could copy my hosts_whatever in that place, but I had to configure the libvirtd-dnsmasq what my local domains are.
Which brings me to the next question: How to set the addn-hosts= for the libvirtd-dnsmasq in the xml file?
You do that with the <host> subelement of the <dns> element. An example is at the same link as above.
Regards, Johannes - -- A good sermon should be like a woman's skirt: short enough to arouse interest but long enough to cover the essentials. (Ronald Knox) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) Comment: Using GnuPG with SeaMonkey - http://www.enigmail.net/
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