Re: sysctl behavior for docker-io

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On Fri, Oct 04, 2013 at 04:04:19PM -0400, Matthew Miller wrote:
> On Fri, Oct 04, 2013 at 02:15:07PM -0500, Lokesh Mandvekar wrote:
> > So, IP forwarding seems to be disabled by default in Fedora. docker-io
> > requires IP forwarding enabled
> > 
> > With respect to packaging, we'd like to have docker-io installation set
> > sysctl values to enable IPv4 and IPv6 forwarding:
> > https://bugzilla.redhat.com/show_bug.cgi?id=1011680
> > 
> > I was told on #fedora-devel that changing sysctl values during installation
> > would spell trouble from a sysadmin's POV, so my plan was to install
> > 80-docker.conf into /usr/lib/sysctl.d but not have the IP forwarding sysctl
> > values take effect at install time. Would this be the right approach?
> 
> I agree that they shouldn't be changed at RPM install time. However, I'm
> also not sure that we should drop something into sysctl.d, because
> 
> a) that doesn't take effect with the case of "yum install docker-io;
>    systemctl start docker", so that's confusing for users
> 
> b) having docker _installed_ isn't really hte case where we need this --
>    it's when docker is running.
> 
> So, my first suggestion is to put the configuration into the systemd service
> file.
> 
> But, I have a question: What does libvirt do? Both as an example, and as a
> possible solution -- will this problem go away when we convert to using
> that, because libvirt will just take care of that?

Josh (cc'd) said libvirtd would enable it, but we still need to take care of
this for docker+lxc.
> 
> -- 
> Matthew Miller  ☁☁☁  Fedora Cloud Architect  ☁☁☁  <mattdm@xxxxxxxxxxxxxxxxx>
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-- 
Lokesh
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