[libvirt] [Dnsmasq-discuss] Chaining instances?

[Gao Yongwei]

2013/2/28 Laine Stump <laine at laine.org>

> On 02/25/2013 09:08 PM, Gao Yongwei wrote:
> >
> > I thinks it's better that if we can put dnsmasq args or options in a
> > conf file, so we can do some custom through this conf file.
> > I've added a Bug 913446 in redhat bugzilla,but seems no one take care
> > of this bug?
>
> This has been discussed extensively on the list before, and we
> specifically *don't* want to do it. Gene Czarcinski even submitted a
> patch that would do it, and that patch was rejected (and I *think* he
> agreed with our reasoning :-)
>
> The problem is that when you allow a user to silently subvert the config
> that is shown in libvirt's XML, and the system stops working, the user
> will send a plea for help to irc/mailing list (or open a ticket with
> their Linux support vendor), and the people they ask for support will
> say "show us the output of 'virsh net-dumpxml mynetwork'", which they
> will send, and then a comedy of errors will ensue until someone finally
> realizes that there is some "extra" configuration that the user isn't
> telling us about.
>
> There are two solutions to that:
>
> 1) add an element for the specific option you want to control in
> libvirt's network XML. Some knobs are already there, and others are
> being added.
>
> 2) add a private "dnsmasq" namespace to libvirt's network xml, with
> provisions for directly passing through dnsmasq commandline options from
> the xml to the conf file. This would be similar to what has already been
> done for qemu: http://libvirt.org/drvqemu.html#qemucommand
>
> The difference between these and the idea of simply allowing a
> user-written conf file is that everything about the network's config
> would then be available in "virsh net-dumpxml $netname".
>
> As far as the bug you've filed, it takes awhile for bugs to be triaged.
> (At a first glance, it seems reasonable to add such an option, since it
> is a standard part of the dhcp protocol. We might need to do something
> about specifying different units for the lease time.)

I 'd better like 2nd solution,because as time goes by,people may need to use
 tons of different options of dnsmasq to meet new requirments.
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