Finally Converting From Bind 8 -> Bind 9
Tim Daneliuk
tundra at tundraware.com
Fri Jul 13 20:11:55 UTC 2007
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 ;)
>
> Alternatively you could start with one M4 file which uses lots of ifdefs
> for the non-shared portions. The create internal and external by
> specifying different definitions to m4. e.g. m4 -D _TYPE=EXTERNAL or m4
> -D _TYPE=INTERNAL.
>
> For a problem with small differences between two files, this is a better
> solution, but not what I'd do in this case.
Me either - conditional content gets clumsy to maintain in a big hurry.
>
> Whole process can be easily controlled with a Makefile (including any
> restarts).
>
> --Alex
>
>
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Tim Daneliuk tundra at tundraware.com
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