How to set a domain to reuse a key?

[Floop]

I got a certificate via certbot (besides many others) that is also automatically renewed.

For that one particular certificate, I want certbot to reuse the key.

I found this answer that tells me that is possible via cli.ini: Certificate renewal: using the same private key - #2 by rg305

However, I want to limit this setting to a single domain/certificate. Is that possible somehow?

[rg305]

Hi @Floop, and welcome to the LE community forum

I think you can put the setting directly into the renewal config files(s) that require that specific setting.
Peruse the folder:
/etc/letsencrypt/renewal/
And the docs:
User Guide — Certbot 2.9.0.dev0 documentation (eff-certbot.readthedocs.io)