ddns-confgen - ddns key generation tool
ddns-confgen [-a algorithm] [-h] [-k
keyname] [-q] [-s name] [-z zone]
ddns-confgen is an utility that generates keys for use in
TSIG signing. The resulting keys can be used, for example, to secure dynamic
DNS updates to a zone, or for the rndc command channel.
The key name can specified using -k parameter and defaults
to ddns-key. The generated key is accompanied by configuration text
and instructions that can be used with nsupdate and named when
setting up dynamic DNS, including an example update-policy statement.
(This usage is similar to the rndc-confgen command for setting up
command-channel security.)
Note that named itself can configure a local DDNS key for
use with nsupdate -l; it does this when a zone is configured with
update-policy local;. ddns-confgen is only needed when a more
elaborate configuration is required: for instance, if nsupdate is to
be used from a remote system.
- -a algorithm
- This option specifies the algorithm to use for the TSIG key. Available
choices are: hmac-md5, hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384,
and hmac-sha512. The default is hmac-sha256. Options are case-insensitive,
and the "hmac-" prefix may be omitted.
- -h
- This option prints a short summary of options and arguments.
- -k keyname
- This option specifies the key name of the DDNS authentication key. The
default is ddns-key when neither the -s nor -z option
is specified; otherwise, the default is ddns-key as a separate
label followed by the argument of the option, e.g.,
ddns-key.example.com. The key name must have the format of a valid
domain name, consisting of letters, digits, hyphens, and periods.
- -q
- This option enables quiet mode, which prints only the key, with no
explanatory text or usage examples. This is essentially identical to
tsig-keygen.
- -s name
- This option generates a configuration example to allow dynamic updates of
a single hostname. The example named.conf text shows how to set an
update policy for the specified name using the "name" nametype.
The default key name is ddns-key.name. Note that the
"self" nametype cannot be used, since the name to be updated may
differ from the key name. This option cannot be used with the -z
option.
- -z zone
- This option generates a configuration example to allow dynamic updates of
a zone. The example named.conf text shows how to set an update
policy for the specified zone using the "zonesub" nametype,
allowing updates to all subdomain names within that zone. This option
cannot be used with the -s option.
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