generate Certificate for Sub domain using certbot

Question

I want generate a certificate for my sub-domain I already have certificate for www.xyz.com I want to generate certificate for a.xyz.com How do I generate using cert bot

Answer 1

You can generate all at once and update it.

certbot certonly --manual -m youremail@mail.com --server https://acme-v02.api.letsencrypt.org/directory --agree-tos -d domain.com,*.domain.com, *.sub.domain.com

May it helps someone