[Lxc-users] lxcbr0 on Ubuntu 12.04

[Serge Hallyn]

Quoting Clemens Perz (cperz at gmx.net):
> 
> 
> On 13.07.2012 17:08, Stéphane Graber wrote:
> > On 07/13/2012 03:36 AM, groupie wrote:
> >> Hi all!
> >>
> >> I tried to figure out a glitch with the bridge interface in precise. Its
> >> a fresh desktop install and after booting the machine, lxcbr0 never exists.
> >>
> >> I open a terminal and do sudo service lxc restart and woop, without
> >> errors, it just comes up.
> >>
> >> Two more details: I dont have any containers in auto, I start them as
> >> needed. And there is a named running for local dns resolution on all
> >> virtual networks (using kde and vmware on the same machine)
> >>
> >> Any ideas where to tweak?
> >>
> >> Cheers,
> >> Your groupie
> > 
> > You'll probably want to check /var/log/upstart/lxc* for errors.
> > 
> > 
> 
> That contained a hint indeed:
> dnsmasq: failed to create listening socket for 192.168.122.1: Address
> already in use
> 
> A look into lxc-net.conf shows that it buggers out when it cant start
> dnsmasq and removes the bridge completely. So at starttime named is some
> milliseconds faster to aquire the bridge interface and makes dnsmasq
> fail. Bridge removed, named kicked in the ass. So you do a restart later
> everything works fine.
> 
> I just added USE_LXC_DNSMASQ="false" to the lxc defaults and the
> corresponding if statement to lxc-net.conf. Works now even on boot time.
> 
> Cheers,
> Groupie

Note that the fix for this (installing an /etc/dnsmasq.d/lxc file which
makes the system-wide dnsmasq bind-interfaces except lxcbr0) should be
clearing SRU soon.  (I thouhgt it already had)

-serge