libvirt users - Mar 2011 - dnsmasq not started when no dhcp enabled ?

Hello everybody,

i've defined a simple network, with no dhcp. I'd like to use dnsmasq 
only as a dns server.

$ virsh net-dumpxml basicswitch
<network>
   <name>basicswitch</name>
   <uuid>60f491d2-d6c4-6b57-8a50-081cace8dedc</uuid>
   <forward mode='nat'/>
   <bridge name='virbr1' stp='on' delay='0' />
   <ip address='192.168.100.1' netmask='255.255.255.0'>
   </ip>
</network>

I start it :

$ virsh net-start basicswitch
Network basicswitch started

$  virsh net-list
Name                 State      Autostart
-----------------------------------------
basicswitch          active     no

But i see no dnsmasq process :

$ ps fax|grep dnsmas[q]

Here the output of "virsh version" :

$ virsh version
Compiled against library: libvir 0.8.8
Using library: libvir 0.8.8
Using API: QEMU 0.8.8
Running hypervisor: QEMU 0.12.5

What is funny is that the dnsmasq process is created on another box with 
different version :

$ virsh version
Compiled against library: libvir 0.8.3
Using library: libvir 0.8.3
Using API: QEMU 0.8.3
Running hypervisor: QEMU 0.12.5

$ ps fax|grep dnsmas[q]
7104 ?        S      0:00 dnsmasq --strict-order --bind-interfaces 
--pid-file=/var/run/libvirt/network/basicswitch.pid --conf-file= 
--listen-address 192.168.100.1 --except-interface lo

Any advice on it ?

Regards,

Jean-Baptiste

On 03/08/2011 09:21 PM, jbd wrote:
> ....

Just updated my working box (Compiled against library: libvir 0.8.3, 
Using library: libvir 0.8.3, Using API: QEMU 0.8.3) to a new libvirt 
(Compiled against library: libvir 0.8.8, Using library: libvir 0.8.8, 
Using API: QEMU 0.8.8) and dnsmasq is not launched anymore.

It looks like a regression. Did i miss something in the changelog or the 
documentation ?

Jean-Baptiste

On 03/08/2011 03:21 PM, jbd wrote:
> Hello everybody,
>
> i've defined a simple network, with no dhcp. I'd like to use
dnsmasq
> only as a dns server.
>
> $ virsh net-dumpxml basicswitch
> <network>
> <name>basicswitch</name>
> <uuid>60f491d2-d6c4-6b57-8a50-081cace8dedc</uuid>
> <forward mode='nat'/>
> <bridge name='virbr1' stp='on' delay='0' />
> <ip address='192.168.100.1' netmask='255.255.255.0'>
> </ip>
> </network>
>
> I start it :
>
> $ virsh net-start basicswitch
> Network basicswitch started
>
> $  virsh net-list
> Name                 State      Autostart
> -----------------------------------------
> basicswitch          active     no
>
> But i see no dnsmasq process :
>
> $ ps fax|grep dnsmas[q]
>
> Here the output of "virsh version" :
>
> $ virsh version
> Compiled against library: libvir 0.8.8
> Using library: libvir 0.8.8
> Using API: QEMU 0.8.8
> Running hypervisor: QEMU 0.12.5
>
> What is funny is that the dnsmasq process is created on another box 
> with different version :
>
> $ virsh version
> Compiled against library: libvir 0.8.3
> Using library: libvir 0.8.3
> Using API: QEMU 0.8.3
> Running hypervisor: QEMU 0.12.5
>
> $ ps fax|grep dnsmas[q]
> 7104 ?        S      0:00 dnsmasq --strict-order --bind-interfaces 
> --pid-file=/var/run/libvirt/network/basicswitch.pid --conf-file= 
> --listen-address 192.168.100.1 --except-interface lo
>
> Any advice on it ?

Sigh. Yes, there was a regression when I added IPv6 support for virtual 
networks. I pushed a fix last night. Thanks for the report!

https://www.redhat.com/archives/libvir-list/2011-March/msg00584.html

     commit 7892edc9cc45e4fb1079b627bda3f571ac27041f
     Author: Laine Stump <laine at laine.org>
     Date:   Fri Mar 11 11:47:58 2011 -0500

     network driver: Start dnsmasq even if no dhcp ranges/hosts are 
specified.