traefik/docs/content/https/ref-acme.yaml

certificatesResolvers:
  le:
    # Enable ACME (Let's Encrypt): automatic SSL.
    acme:

      # Email address used for registration.
      #
      # Required
      #
      email: "test@traefik.io"

      # File or key used for certificates storage.
      #
      # Required
      #
      storage: "acme.json"

      # CA server to use.
      # Uncomment the line to use Let's Encrypt's staging server,
      # leave commented to go to prod.
      #
      # Optional
      # Default: "https://acme-v02.api.letsencrypt.org/directory"
      #
      # caServer: "https://acme-staging-v02.api.letsencrypt.org/directory"

      # KeyType to use.
      #
      # Optional
      # Default: "RSA4096"
      #
      # Available values : "EC256", "EC384", "RSA2048", "RSA4096", "RSA8192"
      #
      # keyType: RSA4096

      # Use a TLS-ALPN-01 ACME challenge.
      #
      # Optional (but recommended)
      #
      tlsChallenge:

      # Use a HTTP-01 ACME challenge.
      #
      # Optional
      #
      # httpChallenge:

        # EntryPoint to use for the HTTP-01 challenges.
        #
        # Required
        #
        # entryPoint: web

      # Use a DNS-01 ACME challenge rather than HTTP-01 challenge.
      # Note: mandatory for wildcard certificate generation.
      #
      # Optional
      #
      # dnsChallenge:

        # DNS provider used.
        #
        # Required
        #
        # provider: digitalocean

        # By default, the provider will verify the TXT DNS challenge record before letting ACME verify.
        # If delayBeforeCheck is greater than zero, this check is delayed for the configured duration in seconds.
        # Useful if internal networks block external DNS queries.
        #
        # Optional
        # Default: 0
        #
        # delayBeforeCheck: 0

        # Use following DNS servers to resolve the FQDN authority.
        #
        # Optional
        # Default: empty
        #
        # resolvers
        # - "1.1.1.1:53"
        # - "8.8.8.8:53"

        # Disable the DNS propagation checks before notifying ACME that the DNS challenge is ready.
        #
        # NOT RECOMMENDED:
        # Increase the risk of reaching Let's Encrypt's rate limits.
        #
        # Optional
        # Default: false
        #
        # disablePropagationCheck: true