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📜 Automatic SSL Certificate Generation for Duck DNS Domains
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README.md

Let's Encrypt for Duck DNS

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Automatically generates Let's Encrypt certificates using a lightweight Docker container without requiring any ports to be exposed for DNS challenges.

Variables

  • DUCKDNS_TOKEN: Duck DNS account token (obtained from Duck DNS)
  • DUCKDNS_DOMAIN: Full Duck DNS domain (e.g. test.duckdns.org)
  • LETSENCRYPT_EMAIL: Email used for certificate renewal notifications (optional)
  • LETSENCRYPT_WILDCARD: true or false, indicating whether the SSL certificate should be for subdomains only of DUCKDNS_DOMAIN (i.e. *.test.duckdns.org), or for the main domain only (i.e. test.duckdns.org) (default: false)
  • TESTING: true or false, indicating whether a staging SSL certificate should be generated or not (default: false)

Note: The format of DUCKDNS_DOMAIN should be the same regardless of the value of LETSENCRYPT_WILDCARD.

Volumes

  • <certs>:/etc/letsencrypt: A named or hosted volume which allows SSL certificates to persist and be accessed by other containers

Note: If a hosted volume is used, the volume should be mounted in an unused directory in another container to prevent access conflicts.