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...The -ca and -ca-key flags are the CA's certificate and private key, respectively. By default, they are ca.pem and ca_key.pem. The -hostname is a comma separated hostname list that overrides the DNS names and IP address in the certificate SAN extension.
hostupd is a command-line tool which allows the user to update a dnsserver which supports dynamic updates (rfc2136), such as bind >= 8. Its main goal is to simplify the dns-updating task, but to remain flexible.