It gave me no error. This was my second attempt, first time I have renewed the certificate on April 28. Everything seemed to work fine but yesterday I have realised that the site has still the old certificate and since it is more than 10 days, the old my-site_fullchain_and_key.p12 file in the /tmp folder was allready gone.
Yesterday it was my second attempt and the renewal returned me this:
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Processing /etc/letsencrypt/renewal/my-website.com.conf
Renewing an existing certificate for my-website.com
Congratulations, all renewals succeeded:
/etc/letsencrypt/live/my-website.com/fullchain.pem (success)
Then I have made an another task and the certbot renew has said that the fullchain.pem certificate is not due for renewal yet, it expires on August 29.