Mass update of TTL and serial

[Chris Buxton]

Scott,

The refresh timer is not the correct target. The refresh timer governs  
replication between master and slave in the absence of notifications.

Instead, target the $TTL line at the top of each zone. This provides  
the default TTL of each record in the absence of any explicit TTL (or  
"inline TTL", as Noel put it).

Chris Buxton
Professional Services
Men & Mice

On May 2, 2009, at 5:12 PM, Scott Haneda wrote:

> On May 2, 2009, at 4:25 PM, Noel Butler wrote:
>
>> On Sun, 2009-05-03 at 08:39, Scott Haneda wrote:
>>>
>>> I client of mine has thousands of DNS zones that will need a ttl
>>> chance and a serial bump.  I want to set a relevant ttl to 300 for a
>>> few days.
>>>
>>> After that, an IP address change will be made, and I would like to
>>> change the TTL back to something sane.  The general format of the  
>>> zone
>>> looks something like below.
>>>
>>> Any suggestions
>>
>> perl  substitutions would be your friend, had to do this myself a  
>> few years back, but the key is do  fresh backup /var/named first,  
>> then try:   perl -pi -e "s/2009....../2009050301/g;" *
>>
>> Maybe again with 2008/7/6 how ever many years you think it goes  
>> back, and don't miss out any of the periods after the year to avoid  
>> missing exact hits.
>>
>> Again for the TTL, if you have inline  hostname specific TTLs, that  
>> will be tricky and I've never had to do them en mass so maybe  
>> someone else has a better way
>>
>> Might be good idea to copy a few zonefiles to  /tmp to play with  
>> first, before you do the live zones, and inspect them.
>
>
> Cool, thanks.  I do not know that I have any inline ttl's set, I  
> certainly think if there are, they will be few, and I can hand  
> change them first.  Would you say the 'refresh' value would be the  
> one I should target?  I am going to change it to something like 299  
> seconds, so it is dead simple to find on in the future.  Thank  
> goodness the serial is in a format of all numbers and a fixed length  
> in my case.
> -- 
> Scott * If you contact me off list replace talklists@ with scott@ *
>
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