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Advanced Certbot / ACME

The normal Certbot path uses an HTTP-01 webroot challenge. Keep port 80 reachable and the hostname pointed at CapRover. Change this only when that path cannot meet your certificate requirements.

  • CapRover can read certbotCertCommandRules and certbotImageName from /captain/data/config-override.json.
  • DNS-01 needs a compatible, long-running Certbot plugin image and credentials readable inside that container.
  • For a Cloudflare DNS plugin, for example, store its credentials file under /captain/data/letsencrypt/etc/captain-files/ with restrictive permissions, then configure the image and command:
{
  "certbotImageName": "YOUR_COMPATIBLE_CERTBOT_IMAGE:TAG",
  "certbotCertCommandRules": [
    {
      "domain": "*",
      "command": "certbot certonly --dns-cloudflare --dns-cloudflare-credentials /etc/letsencrypt/captain-files/mycreds.ini -d ${domainName}"
    }
  ]
}

  • Replace the image with one that includes the DNS plugin and runs as CapRover expects; the stock image does not include every third-party DNS plugin. ${domainName} is expanded by CapRover.

  • The "domain": "*" rule applies to every certificate request, but this command requests only the exact hostname CapRover supplies.

  • If you need a wildcard certificate, plan that request separately with both the base domain and its wildcard name.

  • A rule scoped to a base domain also matches its subdomains, so check the rule matcher before adding a wildcard to a rule.

  • Test the resulting command on a disposable domain; the exact plugin flags and DNS credentials depend on your provider.

  • If CapRover's domain verification is unsuitable for DNS-only validation, review skipVerifyingDomains separately and confirm ownership yourself.

  • Before changing a production server, save the working override and certificate state, validate your custom Certbot command against the plugin's documentation, and test issuance on a disposable domain.

  • Restart the CapRover service with docker service update captain-captain --force so it loads the changed override.

  • For an alternate ACME server, Certbot may also need a cli.ini under /captain/data/letsencrypt/etc/ containing the server URL and any required external-account-binding credentials; check the ACME provider's instructions and your DNS CAA records.

  • Never commit DNS API credentials to a repository.