Re: Finally Converting From Bind 8 -> Bind 9

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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Relevant Pages

  • Re: Finally Converting From Bind 8 -> Bind 9
    ... Tim Daneliuk wrote: ... keep a flat file of public host information for use by db.external, ... 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. ...
    (freebsd-questions)
  • Re: Finally Converting From Bind 8 -> Bind 9
    ... Tim Daneliuk wrote: ... keep a flat file of public host information for use by db.external, ... 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. ...
    (freebsd-questions)