about the file command

[Kevin Darcy]

On 2/8/2011 9:15 AM, Terry. wrote:
> 2011/2/8 Matus UHLAR - fantomas<uhlar at fantomas.sk>:
>> On 08.02.11 17:40, Terry. wrote:
>>> Can BIND's "file" command referer to more than one zone file?
>>> For example,
>>>
>>>        zone "test.nsbeta.info" {
>>>             type master;
>>>             file "a.db";
>>>             file "b.db";
>>>        };
>>>
>>> When a record doesn't exist in a.db, BIND will continue to look for it in
>>> b.db.
>> Afaik, no. Why would you want that?
>
> For views catchall.
>
> for example, named.conf has three views enabled by default, some users
> have three veiws setup, but some have only two views setup, so I want
> the catchall solution for the the lack of a view.
>
There is no "default" named.conf. Are you referring to some named.conf 
that was provided in an OS distribution? As part of a third-party DNS 
management tool? Perhaps you need to provide some specifics about your 
particular environment.

The general approach used with views is to include the entries that 
*every* view should see, into each version of the zone(s) in their 
respective views. Yes, this duplicates data and occupies more memory 
than is strictly necessary. If capacity is a problem, you always have 
the option of running separate nameserver instances on separate hardware 
or virtualized OS instances. Views are only a convenience for those who 
have the capacity and the desire to run multiple "logical" nameserver 
instances inside of a single process running in a single OS image.

This cross-view record-level or RRset-level inclusion can be done either 
through $INCLUDE-file chicanery, or by designing/modifying/configuring 
your DNS maintenance system to make and maintain the relevant entries in 
parallel.

As for selection of views, these are matched in order, so if your last 
view has "match-clients { any; };" (or, if you prefer, 
"match-destinations { any; };", this gives you the "not otherwise 
matched" behavior you seem to be seeking.

                                                                         
                                                                         
                             - Kevin