You acquire an SSL certificate from Let's Encrypt using an ACME client. ACME is a protocol invented concurrently with the Let's Encrypt service for fetching SSL certificates from a provider. The primary ACME client is Certbot, a command-line tool that helps you register a domain with Let's Encrypt, and which automates renewal of Let's Encrypt SSL certificates. For Certbot documentation, see https://certbot.eff.org/.
The container we're about to implement is set up to make it easy to register a domain with Let's Encrypt, and then to automate certificate renewal. It's a very simple container, consisting of a cron daemon, a crontab entry, and the certbot tool. The only CPU consumption ...
