Here you can find the slides from the NGINX Talk 2016 and two additional files.
The first one is a simple bash script to create/renew certificates from Let’Encrypt. It is well commented and should be easy to understand. The second one is just the relative configuration file example. If there is anything you don’t understand about them, please don’t hesitate to ask.
Shortly after I gave my talk (the day after, yay!), letsencrypt client was renamed and became certbot, the development moved entirely to EFF as preannounced. The
le-renew.sh script is already using the new
certbot-auto command. That said,
certbot-auto should be backward compatible, at least by now.