Date: Thu, 24 Apr 2008 08:21:40 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: Poul-Henning Kamp <phk@phk.freebsd.dk> Subject: Re: [RFC] Automated generation of /etc/resolv.conf from the rc.d script Message-ID: <200804240821.40601.jhb@freebsd.org> In-Reply-To: <RlIwVx1VnA2Q57cUUvUPn30sch4@BBB3ZKOzjjN0cxeKaWhgH87x7VY> References: <dEZnki0Fi32EvMrDEnqcgDeNQSc@Bbw9J2Iynx0QjNoWuQ4YSitYS3A> <MIKiw94aov2StL37zxYPU2cwfyE@NKorCT8tqQREs5VbYbldlgOz9%2B8> <RlIwVx1VnA2Q57cUUvUPn30sch4@BBB3ZKOzjjN0cxeKaWhgH87x7VY>
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On Monday 14 April 2008 11:44:13 am Eygene Ryabinkin wrote: > 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@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. You can already override the domain name and DNS servers (including either overriding, providing a default, or prepending or appending to the list) via setings in /etc/dhclient.conf, so I don't think new rc.conf variables for that would be warranted. Updating named.conf to forward is a neat idea. Howver, on my laptop on HEAD I've ended up just running nscd instead of a local DNS server and doing a 'nscd -I hosts' when I get a new lease to flush the host cache. When I get to my laptop I'll post my bits of dhclient-exit-hooks and dhclient.conf to make this work. -- John Baldwin
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