Duplicate certificates, possible?

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1

Hi,

I'm using *.dronten.mydomain.se for services hosted privately.
Since I own the domain mydomain.se, it would be even more convinient to use *.mydomain.se
but since I use one.com for hosting of that domain (separate from *.dronten.mydomain.se) and one-com uses a Let's Encrypt certificate issued towards *.mydomain.se to provide e.g. https I have not dared issuing another certificate to the same domain.

Is it possible to have two independant certificates for the same domain?
Or in other words can I get a *.mydomain.se certificate for my private hosting that will live a life independant of the certificate used by one.com for the same domain?

2

Yes.

But note that for a public cert the hostname also needs to be public. Thus while you could USE the hostname privately, it would be requires for zone to be publicly accessible to get the cert issued.

Except for rate limits there's no limitation of duplicate entries in certs.

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3

Thanks for swift reply :slight_smile:

On the topic of public, maybe not. I use manual renewal and DNS challenge for the certs used in a more private context...

Will explore issuing a second cert for my domain..

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4

The host itself doesn't need to be public if you're using the dns-01 plugin and as long as the domain zone itself is public.

Or is this some kind of split horizon DNS situation where the dronten.example.com is only visible from internally?

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5

Duplicate certificates, possible?

In short, yes.
You can use the exact same cert in multiple systems.
You can also obtain multiple certs with the exact same set of names [rate limits apply].

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