Finally Converting From Bind 8 -> Bind 9

Alex Zbyslaw xfb52 at
Sat Jul 14 10:30:16 UTC 2007

Tim Daneliuk wrote:

> Alex Zbyslaw wrote:
>> Tim Daneliuk wrote:
>>> 2) Better still is there some sort of "include" mechanism where I could
>>>    keep a flat file of public host information for use by db.external,
>>>    but include it into db.internal.
>> I don't think there is, but let someone who uses bind more than I do 
>> give a definitive on that :-)
>> What you *can* do, irrespective of bind version, is to have two files 
>> which you pre-process with m4, and have a third file which m4 
>> includes on both the others.
>> So you start with:
>>    internal.M4 which includes "shared"
>>    external.M4 which also includes "shared"
>>    shared which gets included in the other two.
>> Then m4 internal.M4 > internal and m4 external.M4 -> external.
>> Bind then loads internal and external.
> A reasonable and very Unix-ish solution, certainly.  Though, I think
> the subsequent post on this thread regarding $INCLUDE is probably more
> elegant ;)
Certainly, since bind supports it (it's even in my Bind 8 book, though I 
never noticed it before).

Of course, you can do a heck of a lot more with m4, and it's not limited 
to bind, but in this case I would say that simplicity wins hands down ;-)


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