How to create SAN certificate on Ubuntu 18.04

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1

Hi!
I have to create a SAN certificate for two different domains on Ubuntu 18.04, I don’t find any tutorial on the web for to do that, can you help me?
Thanks!

Mic
(certbot --version -> certbot 0.31.0)

2

Getting multiple names on a single cert is very easy.
With certbot:
Instead of the single: -d one.domain
Use:
-d one.domain -d two.domain -d three.domain …
or
-d 'one.domain,two.domain,three.domain,…'
[LE certs will hold 100 SAN entries]

3

Thank you for your reply!
I think that this command is for a wilcard certificate and not for a san certificate, or not?

Mic

4

No.
Wildcard certs contain an “*”.
-d *.my.domain -d normal.domain -d *.other.wildcard -d not.wild.domain

They can be combined in the same cert.
But be careful as they don’t validate the same - wildcard certs require DNS authentication.

5

Oh!
Thank you very much, this is very helpful!

Mic

1 Like
6

FYI:
All (LE) certs have a SAN field and entry.
Even the ones for a single name.
For those, the CN and the SAN fields/entries would both just be “single.name”

7

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