[CentOS] DNS bind - use of /etc/named directory

[John Horne]

On Tue, 2018-12-04 at 08:19 +0000, J Martin Rushton via CentOS wrote:
> The '/etc/named.conf.rpmnew' file supplied is a bare minimum to
> "configure the ... server as a caching only nameserver (as a localhost
> DNS resolver only)".  As soon as you start adding any structure to it
> things change, not just are added to.  See
> '/usr/share/doc/bind-*/sample/etc/named.conf' for example.  Probably the
> biggest "gotcha" is that as soon as you use _any_ views you MUST use
> views for _all_ zones.
>
> If you were to move the default '/etc/named.conf.rpmnew' to
> '/etc/named.conf' and add an 'include "/etc/named/*";', line as you
> suggest, you would be building problems for the future.  Let's say you
> dropped in 'internal.conf' which had a simple 'view "internal" stanza -
> then your root hints, localhost, localhost IPV6 and reverse localhosts
> would disappear.  Just what you wouldn't want at 00:51 !
>
> What you can do safely is to include the zone definitions in a separate
> file (see '/etc/named.rfc1912.zones' for example) and include that file.
>  Doing things this way means that your main configuration file can be
> written to either use views or not, and to just include your zone
> definitions in the appropriate place.  See the sample file for an example.
>
Thanks for the reply.

However, we don't use views and the local settings are not for zones. We do
currently have a separate zone file, but again that requires an 'include' in
the main '/etc/named.conf'. If a local settings file (in '/etc/named') could be
used, then we would simply 'include' the zone file in that. Ultimately, the
main named.conf file would remain untouched.



John.

>
> On 04/12/18 00:51, John Horne wrote:
> > Hello,
> >
> > For many years we have modified the '/etc/named.conf' file to include local
> > settings. The disadvantage with this is of course that when bind is
> > updated, it
> > creates an '/etc/named.conf.rpmnew' file. We then have to determine what is
> > new, and apply the relevant changes to our modified named.conf file.
> >
> > There is, however, an '/etc/named' directory which I assumed was for local
> > configuration settings. The main '/etc/named.conf' file makes no mention of
> > this directory, so (I suspect) any config files in '/etc/named' would, by
> > default, just be ignored.
> >
> > As far as I can tell we could put our local configuration settings into a
> > file
> > in '/etc/named', but we would then, once again, have to modify
> > '/etc/named.conf' to tell it to include config files in '/etc/named'. We
> > would
> > then be back at square one in that any bind update would create an 'rpmnew'
> > file.
> >
> > I admit I haven't actually tested this, but has anyone used the
> > '/etc/named'
> > directory and not had to modify the main '/etc/named.conf' file?
> >
> > I suspect, if not, then this should be raised as a possible bug since it
> > would
> > make sense not to have to modify the main configuration file at all.
> >
> >
> >
> >
> > Thanks,
> >
> > John.
> >
> > --
> > John Horne | Senior Operations Analyst | Technology and Information
> > Services
> > University of Plymouth | Drake Circus | Plymouth | Devon | PL4 8AA | UK
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--
John Horne | Senior Operations Analyst | Technology and Information Services
University of Plymouth | Drake Circus | Plymouth | Devon | PL4 8AA | UK
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