--ca-bundle Specifies the path to the CA certificate bundle to verify api server's certificate.
--ca-path Specifies directory containing CA certificates in PEM format, used by wget or curl.
--nocron Only valid for'--install' command, which means: do not install the default cron job. In this case, the certs will not be renewed automatically.
--no-color Do not output color text.
--ecc Specifies to use the ECC cert. Valid for'--install-cert', '--renew', '--revoke', '--toPkcs' and '--createCSR'
--csr Specifies the input csr.
--pre-hook Command to be run before obtaining any certificates.