How to generate Let's encrypt certificate with key type RSA/ECDSA using certbot?

Question

Let's Encrypt Certbot default key type is changed to ECDSA with the latest version 2.0.0. How to specify the key type to generate RSA or ECDSA?

Answer 1

Add key type parameter --key-type with desired value rsa/ecdsa . The below command is to generate rsa certificate with docker

docker run -it -v /Users/thirumal/certificate:/etc/letsencrypt certbot/certbot certonly 
--manual --preferred-challenges dns --key-type rsa --email racetortoise@gmail.com 
--server https://acme-v02.api.letsencrypt.org/directory --agree-tos -d '*.example.com'

Refer https://github.com/m-thirumal/installation_guide/blob/master/TLS/let's_encrypt.adoc