[dns-operations] Recommended zone serial number format for over 100 changes / day

[Klaus Malorny]

On 30.03.2016 20:56, Jonathan Tuliani wrote:
> Hi DNS Gurus,
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> RFC1912 recommends the following SOA serial number format: YYYYMMDDnn
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> However, this does not support more than 100 updates per day (whilst this sounds
> like a lot, the fluidity of the Cloud means there are some applications where
> large numbers of changes are commonplace).
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> Is there a recommended serial format that supports large numbers of changes?
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> Thanks in advance,
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> Jonathan Tuliani
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Hi all,

catching up the discussion, I'd like to mention the format we are using:

   YYMMDDhhmm

where YY is the year modulo 40. So every 40 years, a rollover is made, and 
unless you update your zones less frequent than (roughly) every 20 years, it 
won't break the serial number arithmetic. The format allows updates every 
minute, which is, at least in our context, sufficient. And you can clearly read 
when the zone was last updated. From 2040 onward, you'll have to add 40 to the 
years, but I hope that mankind will still be able to do that at that point in 
time despite the downward development in education (I will likely be retired 
then...).

Just my two cents.

Klaus