# certbot

## Synopsis

The objective of Certbot, Let’s Encrypt, and the ACME (Automated Certificate Management Environment) protocol is to make it possible to set up an HTTPS server and have it automatically obtain a browser-trusted certificate, without any human intervention. This is accomplished by running a certificate management agent on the web server.

This agent is used to:

- Automatically prove to the Let’s Encrypt CA that you control the website

- Obtain a browser-trusted certificate and set it up on your web server

- Keep track of when your certificate is going to expire, and renew it

- Help you revoke the certificate if that ever becomes necessary.

## Options

    usage:
      certbot [SUBCOMMAND] [options] [-d DOMAIN] [-d DOMAIN] ...

    Certbot can obtain and install HTTPS/TLS/SSL certificates.  By default,
    it will attempt to use a webserver both for obtaining and installing the
    certificate. The most common SUBCOMMANDS and flags are:

    obtain, install, and renew certificates:
        (default) run   Obtain & install a certificate in your current webserver
        certonly        Obtain or renew a certificate, but do not install it
        renew           Renew all previously obtained certificates that are near expiry
        enhance         Add security enhancements to your existing configuration
       -d DOMAINS       Comma-separated list of domains to obtain a certificate for

      --apache          Use the Apache plugin for authentication & installation
      --standalone      Run a standalone webserver for authentication
      --nginx           Use the Nginx plugin for authentication & installation
      --webroot         Place files in a server's webroot folder for authentication
      --manual          Obtain certificates interactively, or using shell script hooks

       -n               Run non-interactively
      --test-cert       Obtain a test certificate from a staging server
      --dry-run         Test "renew" or "certonly" without saving any certificates to disk

    manage certificates:
        certificates    Display information about certificates you have from Certbot
        revoke          Revoke a certificate (supply --cert-name or --cert-path)
        delete          Delete a certificate (supply --cert-name)
        reconfigure     Update a certificate's configuration (supply --cert-name)

    manage your account:
        register        Create an ACME account
        unregister      Deactivate an ACME account
        update_account  Update an ACME account
        show_account    Display account details
      --agree-tos       Agree to the ACME server's Subscriber Agreement
       -m EMAIL         Email address for important account notifications

    options:
      -h, --help            show this help message and exit
      -c CONFIG_FILE, --config CONFIG_FILE
                            path to config file (default: /etc/letsencrypt/cli.ini
                            and ~/.config/letsencrypt/cli.ini)
      -v, --verbose         This flag can be used multiple times to incrementally
                            increase the verbosity of output, e.g. -vvv. (default:
                            0)
      --max-log-backups MAX_LOG_BACKUPS
                            Specifies the maximum number of backup logs that
                            should be kept by Certbot's built in log rotation.
                            Setting this flag to 0 disables log rotation entirely,
                            causing Certbot to always append to the same log file.
                            (default: 1000)
      -n, --non-interactive, --noninteractive
                            Run without ever asking for user input. This may
                            require additional command line flags; the client will
                            try to explain which ones are required if it finds one
                            missing (default: False)
      --force-interactive   Force Certbot to be interactive even if it detects
                            it's not being run in a terminal. This flag cannot be
                            used with the renew subcommand. (default: False)
      -d DOMAIN, --domains DOMAIN, --domain DOMAIN
                            Domain names to include. For multiple domains you can
                            use multiple -d flags or enter a comma separated list
                            of domains as a parameter. All domains will be
                            included as Subject Alternative Names on the
                            certificate. The first domain will be used as the
                            certificate name, unless otherwise specified or if you
                            already have a certificate with the same name. In the
                            case of a name conflict, a number like -0001 will be
                            appended to the certificate name. (default: Ask)
      --eab-kid EAB_KID     Key Identifier for External Account Binding (default:
                            None)
      --eab-hmac-key EAB_HMAC_KEY
                            HMAC key for External Account Binding (default: None)
      --cert-name CERTNAME  Certificate name to apply. This name is used by
                            Certbot for housekeeping and in file paths; it doesn't
                            affect the content of the certificate itself.
                            Certificate name cannot contain filepath separators
                            (i.e. '/' or '\', depending on the platform). To see
                            certificate names, run 'certbot certificates'. When
                            creating a new certificate, specifies the new
                            certificate's name. (default: the first provided
                            domain or the name of an existing certificate on your
                            system for the same domains)
      --dry-run             Perform a test run against the Let's Encrypt staging
                            server, obtaining test (invalid) certificates but not
                            saving them to disk. This can only be used with the
                            'certonly' and 'renew' subcommands. It may trigger
                            webserver reloads to temporarily modify & roll back
                            configuration files. --pre-hook and --post-hook
                            commands run by default. --deploy-hook commands do not
                            run, unless enabled by --run-deploy-hooks. The test
                            server may be overridden with --server. (default:
                            False)
      --debug-challenges    After setting up challenges, wait for user input
                            before submitting to CA. When used in combination with
                            the `-v` option, the challenge URLs or FQDNs and their
                            expected return values are shown. (default: False)
      --preferred-chain PREFERRED_CHAIN
                            Set the preferred certificate chain. If the CA offers
                            multiple certificate chains, prefer the chain whose
                            topmost certificate was issued from this Subject
                            Common Name. If no match, the default offered chain
                            will be used. (default: None)
      --preferred-challenges PREF_CHALLS
                            A sorted, comma delimited list of the preferred
                            challenge to use during authorization with the most
                            preferred challenge listed first (Eg, "dns" or
                            "http,dns"). Not all plugins support all challenges.
                            See https://certbot.eff.org/docs/using.html#plugins
                            for details. ACME Challenges are versioned, but if you
                            pick "http" rather than "http-01", Certbot will select
                            the latest version automatically. (default: [])
      --issuance-timeout ISSUANCE_TIMEOUT
                            This option specifies how long (in seconds) Certbot
                            will wait for the server to issue a certificate.
                            (default: 90)
      --user-agent USER_AGENT
                            Set a custom user agent string for the client. User
                            agent strings allow the CA to collect high level
                            statistics about success rates by OS, plugin and use
                            case, and to know when to deprecate support for past
                            Python versions and flags. If you wish to hide this
                            information from the Let's Encrypt server, set this to
                            "". (default: CertbotACMEClient/2.8.0 (certbot;
                            OS_NAME OS_VERSION) Authenticator/XXX Installer/YYY
                            (SUBCOMMAND; flags: FLAGS) Py/major.minor.patchlevel).
                            The flags encoded in the user agent are: --duplicate,
                            --force-renew, --allow-subset-of-names, -n, and
                            whether any hooks are set.
      --user-agent-comment USER_AGENT_COMMENT
                            Add a comment to the default user agent string. May be
                            used when repackaging Certbot or calling it from
                            another tool to allow additional statistical data to
                            be collected. Ignored if --user-agent is set.
                            (Example: Foo-Wrapper/1.0) (default: None)

    automation:
      Flags for automating execution & other tweaks

      --keep-until-expiring, --keep, --reinstall
                            If the requested certificate matches an existing
                            certificate, always keep the existing one until it is
                            due for renewal (for the 'run' subcommand this means
                            reinstall the existing certificate). (default: Ask)
      --expand              If an existing certificate is a strict subset of the
                            requested names, always expand and replace it with the
                            additional names. (default: Ask)
      --version             show program's version number and exit
      --force-renewal, --renew-by-default
                            If a certificate already exists for the requested
                            domains, renew it now, regardless of whether it is
                            near expiry. (Often --keep-until-expiring is more
                            appropriate). Also implies --expand. (default: False)
      --renew-with-new-domains
                            If a certificate already exists for the requested
                            certificate name but does not match the requested
                            domains, renew it now, regardless of whether it is
                            near expiry. (default: False)
      --reuse-key           When renewing, use the same private key as the
                            existing certificate. (default: False)
      --no-reuse-key        When renewing, do not use the same private key as the
                            existing certificate. Not reusing private keys is the
                            default behavior of Certbot. This option may be used
                            to unset --reuse-key on an existing certificate.
                            (default: False)
      --new-key             When renewing or replacing a certificate, generate a
                            new private key, even if --reuse-key is set on the
                            existing certificate. Combining --new-key and --reuse-
                            key will result in the private key being replaced and
                            then reused in future renewals. (default: False)
      --allow-subset-of-names
                            When performing domain validation, do not consider it
                            a failure if authorizations can not be obtained for a
                            strict subset of the requested domains. This may be
                            useful for allowing renewals for multiple domains to
                            succeed even if some domains no longer point at this
                            system. This option cannot be used with --csr.
                            (default: False)
      --agree-tos           Agree to the ACME Subscriber Agreement (default: Ask)
      --duplicate           Allow making a certificate lineage that duplicates an
                            existing one (both can be renewed in parallel)
                            (default: False)
      -q, --quiet           Silence all output except errors. Useful for
                            automation via cron. Implies --non-interactive.
                            (default: False)

    security:
      Security parameters & server settings

      --rsa-key-size N      Size of the RSA key. (default: 2048)
      --key-type {rsa,ecdsa}
                            Type of generated private key. Only *ONE* per
                            invocation can be provided at this time. (default:
                            ecdsa)
      --elliptic-curve N    The SECG elliptic curve name to use. Please see RFC
                            8446 for supported values. (default: secp256r1)
      --must-staple         Adds the OCSP Must-Staple extension to the
                            certificate. Autoconfigures OCSP Stapling for
                            supported setups (Apache version >= 2.3.3 ). (default:
                            False)
      --redirect            Automatically redirect all HTTP traffic to HTTPS for
                            the newly authenticated vhost. (default: redirect
                            enabled for install and run, disabled for enhance)
      --no-redirect         Do not automatically redirect all HTTP traffic to
                            HTTPS for the newly authenticated vhost. (default:
                            redirect enabled for install and run, disabled for
                            enhance)
      --hsts                Add the Strict-Transport-Security header to every HTTP
                            response. Forcing browser to always use SSL for the
                            domain. Defends against SSL Stripping. (default: None)
      --uir                 Add the "Content-Security-Policy: upgrade-insecure-
                            requests" header to every HTTP response. Forcing the
                            browser to use https:// for every http:// resource.
                            (default: None)
      --staple-ocsp         Enables OCSP Stapling. A valid OCSP response is
                            stapled to the certificate that the server offers
                            during TLS. (default: None)
      --strict-permissions  Require that all configuration files are owned by the
                            current user; only needed if your config is somewhere
                            unsafe like /tmp/ (default: False)
      --auto-hsts           Gradually increasing max-age value for HTTP Strict
                            Transport Security security header (default: False)

    testing:
      The following flags are meant for testing and integration purposes only.

      --run-deploy-hooks    When performing a test run using `--dry-run` or
                            `reconfigure`, run any applicable deploy hooks. This
                            includes hooks set on the command line, saved in the
                            certificate's renewal configuration file, or present
                            in the renewal-hooks directory. To exclude directory
                            hooks, use --no-directory-hooks. The hook(s) will only
                            be run if the dry run succeeds, and will use the
                            current active certificate, not the temporary test
                            certificate acquired during the dry run. This flag is
                            recommended when modifying the deploy hook using
                            `reconfigure`. (default: False)
      --test-cert, --staging
                            Use the Let's Encrypt staging server to obtain or
                            revoke test (invalid) certificates; equivalent to
                            --server https://acme-
                            staging-v02.api.letsencrypt.org/directory (default:
                            False)
      --debug               Show tracebacks in case of errors (default: False)
      --no-verify-ssl       Disable verification of the ACME server's certificate.
                            The root certificates trusted by Certbot can be
                            overriden by setting the REQUESTS_CA_BUNDLE
                            environment variable. (default: False)
      --http-01-port HTTP01_PORT
                            Port used in the http-01 challenge. This only affects
                            the port Certbot listens on. A conforming ACME server
                            will still attempt to connect on port 80. (default:
                            80)
      --http-01-address HTTP01_ADDRESS
                            The address the server listens to during http-01
                            challenge. (default: )
      --https-port HTTPS_PORT
                            Port used to serve HTTPS. This affects which port
                            Nginx will listen on after a LE certificate is
                            installed. (default: 443)
      --break-my-certs      Be willing to replace or renew valid certificates with
                            invalid (testing/staging) certificates (default:
                            False)

    paths:
      Flags for changing execution paths & servers

      --cert-path CERT_PATH
                            Path to where certificate is saved (with certonly
                            --csr), installed from, or revoked (default: None)
      --key-path KEY_PATH   Path to private key for certificate installation or
                            revocation (if account key is missing) (default: None)
      --fullchain-path FULLCHAIN_PATH
                            Accompanying path to a full certificate chain
                            (certificate plus chain). (default: None)
      --chain-path CHAIN_PATH
                            Accompanying path to a certificate chain. (default:
                            None)
      --config-dir CONFIG_DIR
                            Configuration directory. (default: /etc/letsencrypt)
      --work-dir WORK_DIR   Working directory. (default: /var/lib/letsencrypt)
      --logs-dir LOGS_DIR   Logs directory. (default: /var/log/letsencrypt)
      --server SERVER       ACME Directory Resource URI. (default:
                            https://acme-v02.api.letsencrypt.org/directory)

    manage:
      Various subcommands and flags are available for managing your
      certificates:

      certificates          List certificates managed by Certbot
      delete                Clean up all files related to a certificate
      renew                 Renew all certificates (or one specified with --cert-
                            name)
      revoke                Revoke a certificate specified with --cert-path or
                            --cert-name
      reconfigure           Update renewal configuration for a certificate
                            specified by --cert-name

    run:
      Options for obtaining & installing certificates

    certonly:
      Options for modifying how a certificate is obtained

      --csr CSR             Path to a Certificate Signing Request (CSR) in DER or
                            PEM format. Currently --csr only works with the
                            'certonly' subcommand. (default: None)

    renew:
      The 'renew' subcommand will attempt to renew any certificates previously
      obtained if they are close to expiry, and print a summary of the results.
      By default, 'renew' will reuse the plugins and options used to obtain or
      most recently renew each certificate. You can test whether future renewals
      will succeed with `--dry-run`. Individual certificates can be renewed with
      the `--cert-name` option. Hooks are available to run commands before and
      after renewal; see https://certbot.eff.org/docs/using.html#renewal for
      more information on these.

      --pre-hook PRE_HOOK   Command to be run in a shell before obtaining any
                            certificates. Unless --disable-hook-validation is
                            used, the command’s first word must be the absolute
                            pathname of an executable or one found via the PATH
                            environment variable. Intended primarily for renewal,
                            where it can be used to temporarily shut down a
                            webserver that might conflict with the standalone
                            plugin. This will only be called if a certificate is
                            actually to be obtained/renewed. When renewing several
                            certificates that have identical pre-hooks, only the
                            first will be executed. (default: None)
      --post-hook POST_HOOK
                            Command to be run in a shell after attempting to
                            obtain/renew certificates. Unless --disable-hook-
                            validation is used, the command’s first word must be
                            the absolute pathname of an executable or one found
                            via the PATH environment variable. Can be used to
                            deploy renewed certificates, or to restart any servers
                            that were stopped by --pre-hook. This is only run if
                            an attempt was made to obtain/renew a certificate. If
                            multiple renewed certificates have identical post-
                            hooks, only one will be run. (default: None)
      --deploy-hook DEPLOY_HOOK
                            Command to be run in a shell once for each
                            successfully issued certificate. Unless --disable-
                            hook-validation is used, the command’s first word must
                            be the absolute pathname of an executable or one found
                            via the PATH environment variable. For this command,
                            the shell variable $RENEWED_LINEAGE will point to the
                            config live subdirectory (for example,
                            "/etc/letsencrypt/live/example.com") containing the
                            new certificates and keys; the shell variable
                            $RENEWED_DOMAINS will contain a space-delimited list
                            of renewed certificate domains (for example,
                            "example.com www.example.com") (default: None)
      --disable-hook-validation
                            Ordinarily the commands specified for --pre-
                            hook/--post-hook/--deploy-hook will be checked for
                            validity, to see if the programs being run are in the
                            $PATH, so that mistakes can be caught early, even when
                            the hooks aren't being run just yet. The validation is
                            rather simplistic and fails if you use more advanced
                            shell constructs, so you can use this switch to
                            disable it. (default: False)
      --no-directory-hooks  Disable running executables found in Certbot's hook
                            directories during renewal. (default: False)
      --disable-renew-updates
                            Disable automatic updates to your server configuration
                            that would otherwise be done by the selected installer
                            plugin, and triggered when the user executes "certbot
                            renew", regardless of if the certificate is renewed.
                            This setting does not apply to important TLS
                            configuration updates. (default: False)
      --no-autorenew        Disable auto renewal of certificates. (default: False)

    certificates:
      List certificates managed by Certbot

    delete:
      Options for deleting a certificate

    revoke:
      Options for revocation of certificates

      --reason {unspecified,keycompromise,affiliationchanged,superseded,cessationofoperation}
                            Specify reason for revoking certificate. (default:
                            unspecified)
      --delete-after-revoke
                            Delete certificates after revoking them, along with
                            all previous and later versions of those certificates.
                            (default: None)
      --no-delete-after-revoke
                            Do not delete certificates after revoking them. This
                            option should be used with caution because the 'renew'
                            subcommand will attempt to renew undeleted revoked
                            certificates. (default: None)

    register:
      Options for account registration

      --register-unsafely-without-email
                            Specifying this flag enables registering an account
                            with no email address. This is strongly discouraged,
                            because you will be unable to receive notice about
                            impending expiration or revocation of your
                            certificates or problems with your Certbot
                            installation that will lead to failure to renew.
                            (default: False)
      -m EMAIL, --email EMAIL
                            Email used for registration and recovery contact. Use
                            comma to register multiple emails, ex:
                            u1@example.com,u2@example.com. (default: Ask).
      --eff-email           Share your e-mail address with EFF (default: None)
      --no-eff-email        Don't share your e-mail address with EFF (default:
                            None)

    update_account:
      Options for account modification

    unregister:
      Options for account deactivation.

      --account ACCOUNT_ID  Account ID to use (default: None)

    install:
      Options for modifying how a certificate is deployed

    rollback:
      Options for rolling back server configuration changes

      --checkpoints N       Revert configuration N number of checkpoints.
                            (default: 1)

    plugins:
      Options for the "plugins" subcommand

      --init                Initialize plugins. (default: False)
      --prepare             Initialize and prepare plugins. (default: False)
      --authenticators      Limit to authenticator plugins only. (default: None)
      --installers          Limit to installer plugins only. (default: None)

    enhance:
      Helps to harden the TLS configuration by adding security enhancements to
      already existing configuration.

    show_account:
      Options useful for the "show_account" subcommand:

    reconfigure:
      Common options that may be updated with the "reconfigure" subcommand:

    plugins:
      Plugin Selection: Certbot client supports an extensible plugins
      architecture. See 'certbot plugins' for a list of all installed plugins
      and their names. You can force a particular plugin by setting options
      provided below. Running --help <plugin_name> will list flags specific to
      that plugin.

      --configurator CONFIGURATOR
                            Name of the plugin that is both an authenticator and
                            an installer. Should not be used together with
                            --authenticator or --installer. (default: Ask)
      -a AUTHENTICATOR, --authenticator AUTHENTICATOR
                            Authenticator plugin name. (default: None)
      -i INSTALLER, --installer INSTALLER
                            Installer plugin name (also used to find domains).
                            (default: None)
      --apache              Obtain and install certificates using Apache (default:
                            False)
      --nginx               Obtain and install certificates using Nginx (default:
                            False)
      --standalone          Obtain certificates using a "standalone" webserver.
                            (default: False)
      --manual              Provide laborious manual instructions for obtaining a
                            certificate (default: False)
      --webroot             Obtain certificates by placing files in a webroot
                            directory. (default: False)
      --dns-cloudflare      Obtain certificates using a DNS TXT record (if you are
                            using Cloudflare for DNS). (default: False)
      --dns-digitalocean    Obtain certificates using a DNS TXT record (if you are
                            using DigitalOcean for DNS). (default: False)
      --dns-dnsimple        Obtain certificates using a DNS TXT record (if you are
                            using DNSimple for DNS). (default: False)
      --dns-dnsmadeeasy     Obtain certificates using a DNS TXT record (if you are
                            using DNS Made Easy for DNS). (default: False)
      --dns-gehirn          Obtain certificates using a DNS TXT record (if you are
                            using Gehirn Infrastructure Service for DNS).
                            (default: False)
      --dns-google          Obtain certificates using a DNS TXT record (if you are
                            using Google Cloud DNS). (default: False)
      --dns-linode          Obtain certificates using a DNS TXT record (if you are
                            using Linode for DNS). (default: False)
      --dns-luadns          Obtain certificates using a DNS TXT record (if you are
                            using LuaDNS for DNS). (default: False)
      --dns-nsone           Obtain certificates using a DNS TXT record (if you are
                            using NS1 for DNS). (default: False)
      --dns-ovh             Obtain certificates using a DNS TXT record (if you are
                            using OVH for DNS). (default: False)
      --dns-rfc2136         Obtain certificates using a DNS TXT record (if you are
                            using BIND for DNS). (default: False)
      --dns-route53         Obtain certificates using a DNS TXT record (if you are
                            using Route53 for DNS). (default: False)
      --dns-sakuracloud     Obtain certificates using a DNS TXT record (if you are
                            using Sakura Cloud for DNS). (default: False)

    apache:
      Apache Web Server plugin (Please note that the default values of the
      Apache plugin options change depending on the operating system Certbot is
      run on.)

      --apache-enmod APACHE_ENMOD
                            Path to the Apache 'a2enmod' binary (default: None)
      --apache-dismod APACHE_DISMOD
                            Path to the Apache 'a2dismod' binary (default: None)
      --apache-le-vhost-ext APACHE_LE_VHOST_EXT
                            SSL vhost configuration extension (default: -le-
                            ssl.conf)
      --apache-server-root APACHE_SERVER_ROOT
                            Apache server root directory (default: /etc/apache2)
      --apache-vhost-root APACHE_VHOST_ROOT
                            Apache server VirtualHost configuration root (default:
                            None)
      --apache-logs-root APACHE_LOGS_ROOT
                            Apache server logs directory (default:
                            /var/log/apache2)
      --apache-challenge-location APACHE_CHALLENGE_LOCATION
                            Directory path for challenge configuration (default:
                            /etc/apache2)
      --apache-handle-modules APACHE_HANDLE_MODULES
                            Let installer handle enabling required modules for you
                            (Only Ubuntu/Debian currently) (default: False)
      --apache-handle-sites APACHE_HANDLE_SITES
                            Let installer handle enabling sites for you (Only
                            Ubuntu/Debian currently) (default: False)
      --apache-ctl APACHE_CTL
                            Full path to Apache control script (default:
                            apache2ctl)
      --apache-bin APACHE_BIN
                            Full path to apache2/httpd binary (default: None)

    dns-cloudflare:
      Obtain certificates using a DNS TXT record (if you are using Cloudflare
      for DNS).

      --dns-cloudflare-propagation-seconds DNS_CLOUDFLARE_PROPAGATION_SECONDS
                            The number of seconds to wait for DNS to propagate
                            before asking the ACME server to verify the DNS
                            record. (default: 10)
      --dns-cloudflare-credentials DNS_CLOUDFLARE_CREDENTIALS
                            Cloudflare credentials INI file. (default: None)

    dns-digitalocean:
      Obtain certificates using a DNS TXT record (if you are using DigitalOcean
      for DNS).

      --dns-digitalocean-propagation-seconds DNS_DIGITALOCEAN_PROPAGATION_SECONDS
                            The number of seconds to wait for DNS to propagate
                            before asking the ACME server to verify the DNS
                            record. (default: 10)
      --dns-digitalocean-credentials DNS_DIGITALOCEAN_CREDENTIALS
                            DigitalOcean credentials INI file. (default: None)

    dns-dnsimple:
      Obtain certificates using a DNS TXT record (if you are using DNSimple for
      DNS).

      --dns-dnsimple-propagation-seconds DNS_DNSIMPLE_PROPAGATION_SECONDS
                            The number of seconds to wait for DNS to propagate
                            before asking the ACME server to verify the DNS
                            record. (default: 30)
      --dns-dnsimple-credentials DNS_DNSIMPLE_CREDENTIALS
                            DNSimple credentials INI file. (default: None)

    dns-dnsmadeeasy:
      Obtain certificates using a DNS TXT record (if you are using DNS Made Easy
      for DNS).

      --dns-dnsmadeeasy-propagation-seconds DNS_DNSMADEEASY_PROPAGATION_SECONDS
                            The number of seconds to wait for DNS to propagate
                            before asking the ACME server to verify the DNS
                            record. (default: 60)
      --dns-dnsmadeeasy-credentials DNS_DNSMADEEASY_CREDENTIALS
                            DNS Made Easy credentials INI file. (default: None)

    dns-gehirn:
      Obtain certificates using a DNS TXT record (if you are using Gehirn
      Infrastructure Service for DNS).

      --dns-gehirn-propagation-seconds DNS_GEHIRN_PROPAGATION_SECONDS
                            The number of seconds to wait for DNS to propagate
                            before asking the ACME server to verify the DNS
                            record. (default: 30)
      --dns-gehirn-credentials DNS_GEHIRN_CREDENTIALS
                            Gehirn Infrastructure Service credentials file.
                            (default: None)

    dns-google:
      Obtain certificates using a DNS TXT record (if you are using Google Cloud
      DNS for DNS).

      --dns-google-propagation-seconds DNS_GOOGLE_PROPAGATION_SECONDS
                            The number of seconds to wait for DNS to propagate
                            before asking the ACME server to verify the DNS
                            record. (default: 60)
      --dns-google-credentials DNS_GOOGLE_CREDENTIALS
                            Path to Google Cloud DNS service account JSON file to
                            use instead of relying on Application Default
                            Credentials (ADC). (See https://cloud.google.com/docs/
                            authentication/application-default-credentials for
                            information about ADC, https://developers.google.com/i
                            dentity/protocols/OAuth2ServiceAccount#creatinganaccou
                            nt for information about creating a service account,
                            and https://cloud.google.com/dns/access-
                            control#permissions_and_roles for information about
                            the permissions required to modify Cloud DNS records.)
                            (default: None)
      --dns-google-project DNS_GOOGLE_PROJECT
                            The ID of the Google Cloud project that the Google
                            Cloud DNS managed zone(s) reside in. This will be
                            determined automatically if not specified. (default:
                            None)

    dns-linode:
      Obtain certificates using a DNS TXT record (if you are using Linode for
      DNS).

      --dns-linode-propagation-seconds DNS_LINODE_PROPAGATION_SECONDS
                            The number of seconds to wait for DNS to propagate
                            before asking the ACME server to verify the DNS
                            record. (default: 120)
      --dns-linode-credentials DNS_LINODE_CREDENTIALS
                            Linode credentials INI file. (default: None)

    dns-luadns:
      Obtain certificates using a DNS TXT record (if you are using LuaDNS for
      DNS).

      --dns-luadns-propagation-seconds DNS_LUADNS_PROPAGATION_SECONDS
                            The number of seconds to wait for DNS to propagate
                            before asking the ACME server to verify the DNS
                            record. (default: 30)
      --dns-luadns-credentials DNS_LUADNS_CREDENTIALS
                            LuaDNS credentials INI file. (default: None)

    dns-nsone:
      Obtain certificates using a DNS TXT record (if you are using NS1 for DNS).

      --dns-nsone-propagation-seconds DNS_NSONE_PROPAGATION_SECONDS
                            The number of seconds to wait for DNS to propagate
                            before asking the ACME server to verify the DNS
                            record. (default: 30)
      --dns-nsone-credentials DNS_NSONE_CREDENTIALS
                            NS1 credentials file. (default: None)

    dns-ovh:
      Obtain certificates using a DNS TXT record (if you are using OVH for DNS).

      --dns-ovh-propagation-seconds DNS_OVH_PROPAGATION_SECONDS
                            The number of seconds to wait for DNS to propagate
                            before asking the ACME server to verify the DNS
                            record. (default: 120)
      --dns-ovh-credentials DNS_OVH_CREDENTIALS
                            OVH credentials INI file. (default: None)

    dns-rfc2136:
      Obtain certificates using a DNS TXT record (if you are using BIND for
      DNS).

      --dns-rfc2136-propagation-seconds DNS_RFC2136_PROPAGATION_SECONDS
                            The number of seconds to wait for DNS to propagate
                            before asking the ACME server to verify the DNS
                            record. (default: 60)
      --dns-rfc2136-credentials DNS_RFC2136_CREDENTIALS
                            RFC 2136 credentials INI file. (default: None)

    dns-route53:
      Obtain certificates using a DNS TXT record (if you are using AWS Route53
      for DNS).

    dns-sakuracloud:
      Obtain certificates using a DNS TXT record (if you are using Sakura Cloud
      for DNS).

      --dns-sakuracloud-propagation-seconds DNS_SAKURACLOUD_PROPAGATION_SECONDS
                            The number of seconds to wait for DNS to propagate
                            before asking the ACME server to verify the DNS
                            record. (default: 90)
      --dns-sakuracloud-credentials DNS_SAKURACLOUD_CREDENTIALS
                            Sakura Cloud credentials file. (default: None)

    manual:
      Authenticate through manual configuration or custom shell scripts. When
      using shell scripts, an authenticator script must be provided. The
      environment variables available to this script depend on the type of
      challenge. $CERTBOT_DOMAIN will always contain the domain being
      authenticated. For HTTP-01 and DNS-01, $CERTBOT_VALIDATION is the
      validation string, and $CERTBOT_TOKEN is the filename of the resource
      requested when performing an HTTP-01 challenge. An additional cleanup
      script can also be provided and can use the additional variable
      $CERTBOT_AUTH_OUTPUT which contains the stdout output from the auth
      script. For both authenticator and cleanup script, on HTTP-01 and DNS-01
      challenges, $CERTBOT_REMAINING_CHALLENGES will be equal to the number of
      challenges that remain after the current one, and $CERTBOT_ALL_DOMAINS
      contains a comma-separated list of all domains that are challenged for the
      current certificate.

      --manual-auth-hook MANUAL_AUTH_HOOK
                            Path or command to execute for the authentication
                            script (default: None)
      --manual-cleanup-hook MANUAL_CLEANUP_HOOK
                            Path or command to execute for the cleanup script
                            (default: None)

    nginx:
      Nginx Web Server plugin

      --nginx-server-root NGINX_SERVER_ROOT
                            Nginx server root directory. (default: /etc/nginx or
                            /usr/local/etc/nginx)
      --nginx-ctl NGINX_CTL
                            Path to the 'nginx' binary, used for 'configtest' and
                            retrieving nginx version number. (default: nginx)
      --nginx-sleep-seconds NGINX_SLEEP_SECONDS
                            Number of seconds to wait for nginx configuration
                            changes to apply when reloading. (default: 1)

    null:
      Null Installer

    standalone:
      Runs an HTTP server locally which serves the necessary validation files
      under the /.well-known/acme-challenge/ request path. Suitable if there is
      no HTTP server already running. HTTP challenge only (wildcards not
      supported).

    webroot:
      Saves the necessary validation files to a .well-known/acme-challenge/
      directory within the nominated webroot path. A seperate HTTP server must
      be running and serving files from the webroot path. HTTP challenge only
      (wildcards not supported).

      --webroot-path WEBROOT_PATH, -w WEBROOT_PATH
                            public_html / webroot path. This can be specified
                            multiple times to handle different domains; each
                            domain will have the webroot path that preceded it.
                            For instance: `-w /var/www/example -d example.com -d
                            www.example.com -w /var/www/thing -d thing.net -d
                            m.thing.net` (default: Ask)
      --webroot-map WEBROOT_MAP
                            JSON dictionary mapping domains to webroot paths; this
                            implies -d for each entry. You may need to escape this
                            from your shell. E.g.: --webroot-map
                            '{"eg1.is,m.eg1.is":"/www/eg1/", "eg2.is":"/www/eg2"}'
                            This option is merged with, but takes precedence over,
                            -w / -d entries. At present, if you put webroot-map in
                            a config file, it needs to be on a single line, like:
                            webroot-map = {"example.com":"/var/www"}. (default:
                            {})