Re: Docker/Libvirt networking issue / bug?

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On Thu, Oct 06, 2016 at 02:02:09PM -0500, Dan Williams wrote:
> On Thu, 2016-10-06 at 12:39 -0600, Nathanael D. Noblet wrote:
> > On Thu, 2016-10-06 at 14:28 -0400, Neil Horman wrote:
> > > 
> > > I rarely mess with docker, but I expect that the docker0 bridge has
> > > an ip
> > > address on it which may conflict with the one on libvirt
> > > bridge.  That is to
> > > say, if they are on the same subnet, and the route for the docker0
> > > bridge takes
> > > precidence, you will loose dhcp.  Check the docker bridge ip and
> > > remove it if
> > > you see one, I expect that will restore your functionality
> > > 
> > 
> > Unfortunately that isn't the issue as the docker bridge is 172... and
> > bridge0 is 192.168... so they don't conflict. Also docker0 doesn't
> > seem
> > to have any devices (meaning it brctl show has no interfaces attached
> > to it). Finally shutting down docker and removing docker0 doesn't
> > restore connectivity, only a reboot does. Not even restarting NM
> > fixes
> > the issue.
> 
> Try running 'iptables-save' before you start docker, and then running
> 'iptables-save' after.  Diff the results.  Did docker remove anything?
> 
+1, thats the next thing to look at.  Both docker and libvirt use iptables to
direct traffic in various ways.  They may well be in conflict
Neil

> Dan
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