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<div class="moz-cite-prefix">On 2016-03-30 11:56, Jonathan Tuliani
wrote:<br>
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<p class="MsoNormal"><span lang="EN-GB">Hi DNS Gurus,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">RFC1912 recommends the
following SOA serial number format: YYYYMMDDnn<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">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).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Is there a recommended
serial format that supports large numbers of changes?<o:p></o:p></span></p>
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<br>
Whatever you want? There's really no reason to maintain YYYYMMDDnn
unless you're editing zones by hand and can't keep notes.<br>
<br>
I use YYYY followed by a timestamp for zones that are synthesized
from database. I stuck with the YYYY because I had a stupid
monitoring system that would throw errors, but it just looked for
20[012]\d{5,} or similar. Threw out that system, but the format
stuck until there's a reason to change it.<br>
<br>
The only real consideration when you're changing formats is to make
sure that either your new format starts out generating higher serial
numbers than you use today, or that you're ready and able to get
your slaves to accept lower serial numbers once. If you control your
slaves, this is trivial, but if you use a hosted solution, it may be
more complicated.<br>
<br>
<pre class="moz-signature" cols="72">--
Dave Warren
<a class="moz-txt-link-freetext" href="http://www.hireahit.com/">http://www.hireahit.com/</a>
<a class="moz-txt-link-freetext" href="http://ca.linkedin.com/in/davejwarren">http://ca.linkedin.com/in/davejwarren</a>
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