Re: F24 System Wide Change: Default Local DNS Resolver

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On Wed, 2015-12-16 at 10:45 -0500, Neal Becker wrote:
> Tomasz Torcz wrote:
> 
> > On Wed, Dec 16, 2015 at 09:33:18AM -0500, Neal Becker wrote:
> > > P J P wrote:
> > > 
> > > > > On Wednesday, 2 December 2015 6:33 PM, Neal Becker wrote:
> > > > 
> > > > > > https://bugzilla.redhat.com/show_bug.cgi?id=1287607
> > > > 
> > > > 
> > > >   Thank you for filing the bug.
> > > > 
> > > > 
> > > > > * howto prevent dnsmasq from starting (right now I'm just
> > > > > manually
> > > > > killing it for testing)
> > > > 
> > > >   # systemctl disable dnsmasq
> > > > 
> > > > 
> > > 
> > > ps aux | grep dns
> > > nobody    1056  0.0  0.0  57544   484 ?        S    Dec14   0:00
> > > /sbin/dnsmasq --conf-file=/var/lib/libvir
> > > root      1058  0.0  0.0  57516    24 ?        S    Dec14   0:00
> > > /sbin/dnsmasq --conf-file=/var/lib/libvir
> > 
> >   Try
> > systemctl status 1056
> > 
> > I guess it's started by libvirtd.
> > 
> 
> Yes, and does it have to be stopped in order for local dns resolver
> to 
> function?

No, it doesn't.  If you look at the config file for each instance
you'll see 

interface=virbr0    (or something similar)
except-interface=lo

otherwise you'd never be able to run multiple VMs with different
network setups.  The libvirt dnsmasq instance should be binding to the
interface that libvirt owns/manages and nothing else.

Same thing for NetworkManager's "internet connection sharing"
functionality with dnsmasq.

But using NetworkManager's dns=dnsmasq config option *does* tell NM to
spawn dnsmasq as a local caching nameserver listening on lo and that
will conflict with unbound.

Dan
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