Changing $TTL for many zones

[Justin Randall]

>Furthermore, if you would like the ability of controlling a change to 
>the TTL for all domains, a good solution to look into would be 
>constructing a script that would be able to adjust the TTL value in the 
>SOA RRs for each zone file.

Slight thing I left out:  You could edit the serial number through this
method as well.

- Justin

-----Original Message-----
From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org] On Behalf
Of Justin Randall
Sent: August 2, 2004 8:05 PM
To: comp-protocols-dns-bind at isc.org
Subject: RE: Changing $TTL for many zones

>Exactly. I would go further and suggest that, since the SOA needs to be 
>changed anyway, just give an explicit TTL to the SOA RR, and thus 
>dispense with the $TTL directive completely (my assumption here is that 
>the SOA RR is the first RR in the zone file).

Furthermore, if you would like the ability of controlling a change to the
TTL for all domains, a good solution to look into would be constructing a
script that would be able to adjust the TTL value in the SOA RRs for each
zone file.

A good example of a language you could use would be PERL, as you can make
use of semi-colons as delimiters in the SOA RR when indicating which section
of the zone file to modify.

- Justin

-----Original Message-----
From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org] On Behalf
Of Kevin Darcy
Sent: August 2, 2004 7:51 PM
To: comp-protocols-dns-bind at isc.org
Subject: Re: Changing $TTL for many zones

phn at icke-reklam.ipsec.nu wrote:

>Josh Harding <jharding at brave.cs.uml.edu> wrote:
>  
>
>>I was wondering if it's possible to use an include with bind9 to set the 
>>time to live. This would allow me to easily change the ttl when we make 
>>changes in the future. 
>>    
>>
>>The syntax I was contemplating would look like this
>>in db.somedomain:
>> $include db.ttl.inc
>>    
>>
>
>  
>
>>and in db.ttl.inc:
>>$TTL 86400      ;to be changed at my convenience
>>    
>>
>
>  
>
>>Would this work?
>>    
>>
>
>Yes. But why ? You still have to edit at least the SOA record to increase 
>serial nr.
>
Exactly. I would go further and suggest that, since the SOA needs to be 
changed anyway, just give an explicit TTL to the SOA RR, and thus 
dispense with the $TTL directive completely (my assumption here is that 
the SOA RR is the first RR in the zone file).

                                                                         
                                                   - Kevin