Automating Let’s Encrypt Certificate Renewal with DNS Challenge

Simplified demonstration of certificate renewal with DNS challenge
  1. Certbot requests for certificate renewal
  2. Let’s Encrypt sends DNS challenge with TXT value
  3. Automation on the server parses certbot output and updates local DNS server configuration with the TXT value
  4. As soon as certbot confirms the update, let’s encrypt verifies the TXT record of _acme-challenge.example.com
Preconfigure local server
certbot normal output
Content of certbot.exp
Redirect output of certbot to a log file
Parse certbot output and update dnsmasq config

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