In article <20190109164709.6f869d92@computer> you write:
>On 8 Jan 2019 15:59:30 -0500
>"John R Levine" <[email protected]> wrote:
>
>> I can set up the TXT records easily enough, but it looks like I need
>> an HTTPS server with 80 names and 80 certficates, or one certificate
>> with 80 alt names.  That doesn't scale very well.
>
>I believe the thing you want is automation.

I already have automation to renew all my certs.  But I can tell you
that DNS based renewals are slightly flaky because of server update
delays and caches.

>There's no technical scalability issue here, ...

If you have to validate 80 names, and each validation works 98% of the
time, validating all 80 alt names in a row only works 19% of the time.
That's the scalability issue.

If I can set up SNI so the certs are independent, that scales a lot
better, since a renewal failure in one doesn't affect the other 79.

R's,
John

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