dynamic update to SOA records
marka at isc.org
Fri May 4 01:25:39 UTC 2012
In message <f771e61acd065e9d65064d44e69d1bd2 at mail.mxes.net>, cloud cache writes
> But, how will I know the current serial number of the zone, if the zone
> has been changing frequently?
> Thank you.
You ask the master for the current SOA, add a small number to the
serial then send, then check the result by requerying the master.
Look at the fields you want to change not the serial when checking.
The examples so far have a small number as 1 but it can be anything
less than 2^31-1 and NO, I DO NOT RECOMMEND adding 2^31-1 to the
serial when doing this. Script it. If serial + 1, doesn't work
re-try with serial + 2, then serial + 3, etc. Eventually you will
hit a increment that is bigger that the average update rate. Note
I would not go above serial + 100.
> On Tue, 01 May 2012 09:42:40 +0100, Phil Mayers
> <p.mayers at imperial.ac.uk> wrote:
> > On 04/27/2012 02:37 AM, cloud cache wrote:
> >> Hello,
> >> How to use nsupdate to dynamic update the SOA records?
> >> For example, I want to update the zone's contact email and main NS
> > As others have pointed out, you just need to use "nsupdate" and send
> > a valid SOA.
> > NOTE: "valid" means "must have a serial number > current". Bind won't
> > do this for you - you need to choose an appropriate, higher, SOA
> > serial in the new record you send. Adding 1 is fine.
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka at isc.org
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