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rndc-confgen - 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 rndc.key in /etc (or a different sysconfdir specified when BIND was built) 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.
-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:



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


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2021-04-19 9.16.15-Debian