====== Let's Encrypt ======


  /opt/letsencrypt/letsencrypt-auto certonly \
    --debug \
    --webroot \
    -w /home/user/public_html \
    -d domain.com -d www.domain.com -d domainalt.com -d www.domainalt.com \
    --config /etc/letsencrypt/config.ini \
    --agree-tos

  * [[https://certbot.eff.org/docs/using.html#|Certbot User Guide]]