Certificate. LetsEncrypt. Not tied to the root of the site. How?

Question

Nginx

How to generate a LetsEncrypt certificate without a web server installed?
If possible, I would like to do the generation script

Answer 1

Certbot
(with "No server" instructions selected, for Ubuntu 16)
https://certbot.eff.org/lets-encrypt/ubuntuxenial-other

Answer 2

You can generally wildcard certificate from letsencrypt, sitting on the cloudflare site
https://habr.com/post/354052/