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rndc-confgen - Man Page

rndc key generation tool


rndc-confgen [-a] [-A algorithm] [-b keysize] [-c keyfile] [-h] [-k keyname] [-p port] [-s address] [-t chrootdir] [-u user]


rndc-confgen generates configuration files for rndc. It can be used as a convenient alternative to writing the rndc.conf file and the corresponding controls and key statements in named.conf by hand. Alternatively, it can be run with the -a option to set up a rndc.key file and avoid the need for a rndc.conf file and a controls statement altogether.



This option sets automatic rndc configuration, which creates a file /etc/rndc.key that is read by both rndc and named on startup. The rndc.key file defines a default command channel and authentication key allowing rndc to communicate with named on the local host with no further configuration.

If a more elaborate configuration than that generated by rndc-confgen -a is required, for example if rndc is to be used remotely, run rndc-confgen without the -a option and set up rndc.conf and named.conf as directed.

-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.

-b keysize

This option specifies the size of the authentication key in bits. The size must be between 1 and 512 bits; the default is the hash size.

-c keyfile

This option is used with the -a option to specify an alternate location for rndc.key.


This option prints a short summary of the options and arguments to rndc-confgen.

-k keyname

This option specifies the key name of the rndc authentication key. This must be a valid domain name. The default is rndc-key.

-p port

This option specifies the command channel port where named listens for connections from rndc. The default is 953.


This option prevets printing the written path in automatic configuration mode.

-s address

This option specifies the IP address where named listens for command-channel connections from rndc. The default is the loopback address

-t chrootdir

This option is used with the -a option to specify a directory where named runs chrooted. An additional copy of the rndc.key is written relative to this directory, so that it is found by the chrooted named.

-u user

This option is used with the -a option to set the owner of the generated rndc.key file. If -t is also specified, only the file in the chroot area has its owner changed.


To allow rndc to be used with no manual configuration, run:

rndc-confgen -a

To print a sample rndc.conf file and the corresponding controls and key statements to be manually inserted into named.conf, run:


See Also

rndc(8), rndc.conf(5), named(8), BIND 9 Administrator Reference Manual.


Internet Systems Consortium

Referenced By

named.conf(5), rndc(8), rndc.conf(5).

9.18.26 BIND 9