--ipv6 (-6) Resolve names to IPv6 addresses only
--domain (-d) domain.tld Use specified domain name(s) instead of domains.txt entry (one certificate!)
--force (-x) Force renew of certificate even if it is longer valid than value in RENEW_DAYS
+ --no-lock (-n) Don't use lockfile (potentially dangerous!)
--ocsp Sets option in CSR indicating OCSP stapling to be mandatory
--privkey (-p) path/to/key.pem Use specified private key instead of account key (useful for revocation)
--config (-f) path/to/config Use specified config file