[RFC] Automated generation of /etc/resolv.conf from the rc.d script

[Eygene Ryabinkin]

Poul-Henning, good day.

Fri, Dec 14, 2007 at 02:07:00PM +0300, Eygene Ryabinkin wrote:
> Fri, Dec 14, 2007 at 10:57:38AM +0000, Poul-Henning Kamp wrote:
> > In message <dEZnki0Fi32EvMrDEnqcgDeNQSc at Bbw9J2Iynx0QjNoWuQ4YSitYS3A>, Eygene Ryabinkin writes:
> > >> It should be possible to run a local named even when we run DHCP,
> > >> and it shuld be an option, to have it automatically forward to the
> > >> DNS servers we learn from DHCP.
> > >
> > >This can be achieved with the script /etc/dhclient-exit-hooks that
> > >will create the file with named 'forwarders' clause [...]
> > 
> > Yes, I know that, but I would like to see it controllable from rc.conf
> > like the rest of our network configuration.
> 
> OK, since running local DNS instance is a neat idea, I will try to
> draft the modifications for the dhclient-exit-hooks, as I described
> in the previous mail.

At last, I did the needed modifications: patches against 7.0 from
yesterday, April 13th, are attached.  The first one enables the
creation of /etc/resolv.conf from rc.conf variables and the second
brings the named forwarders rewriting using values obtained via
DHCP.  I had touched dhclient-script, but it was really needed,
because it is not good to have simular functionality in /etc/rc.d/resolv
and in the dhclient-script.

I decided not to cope with modifications of /etc/namedb/named.conf,
but rather to create other file, /etc/namedb/named.forwarders.conf,
that should be included from the main configuration.

I am living for two days with this configuration (DHCP + local named
instance) and no problems were spotted yet.

Testing and feedback are more than welcome.
-- 
Eygene
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