06-05-2012
Yes, service command would not only load the zone files, but also will reload config files like named.conf etc. rndc utility is not only for loading the zone it's very useful when it comes to administering DNS. You can do zone transfer with this and many more, check man rndc for more info. Suppose you have updated just a host record on the forward and reverse lookup zones, you do not need to restart the whole service for that.
By the way, if you do not want even a small interruption to the named service, you will do the rndc way rather than the service way. For production systems, it matters.
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RNDC(8) RNDC(8)
NAME
rndc - name server control utility
SYNOPSIS
rndc [ -c config-file ] [ -k key-file ] [ -s server ] [ -p port ] [ -V ] [ -y key_id ] command
DESCRIPTION
rndc controls the operation of a name server. It supersedes the ndc utility that was provided in old BIND releases. If rndc is invoked with
no command line options or arguments, it prints a short summary of the supported commands and the available options and their arguments.
rndc communicates with the name server over a TCP connection, sending commands authenticated with digital signatures. In the current ver-
sions of rndc and named named the only supported authentication algorithm is HMAC-MD5, which uses a shared secret on each end of the con-
nection. This provides TSIG-style authentication for the command request and the name server's response. All commands sent over the chan-
nel must be signed by a key_id known to the server.
rndc reads a configuration file to determine how to contact the name server and decide what algorithm and key it should use.
OPTIONS
-c config-file
Use config-file as the configuration file instead of the default, /etc/rndc.conf.
-k key-file
Use key-file as the key file instead of the default, /etc/rndc.key. The key in /etc/rndc.key will be used to authenticate commands
sent to the server if the config-file does not exist.
-s server
server is the name or address of the server which matches a server statement in the configuration file for rndc. If no server is
supplied on the command line, the host named by the default-server clause in the option statement of the configuration file will be
used.
-p port
Send commands to TCP port port instead of BIND 9's default control channel port, 953.
-V Enable verbose logging.
-y keyid
Use the key keyid from the configuration file. keyid must be known by named with the same algorithm and secret string in order for
control message validation to succeed. If no keyid is specified, rndc will first look for a key clause in the server statement of
the server being used, or if no server statement is present for that host, then the default-key clause of the options statement.
Note that the configuration file contains shared secrets which are used to send authenticated control commands to name servers. It
should therefore not have general read or write access.
For the complete set of commands supported by rndc, see the BIND 9 Administrator Reference Manual or run rndc without arguments to see its
help message.
LIMITATIONS
rndc does not yet support all the commands of the BIND 8 ndc utility.
There is currently no way to provide the shared secret for a key_id without using the configuration file.
Several error messages could be clearer.
SEE ALSO
rndc.conf(5), named(8), named.conf(5) ndc(8), BIND 9 Administrator Reference Manual.
AUTHOR
Internet Software Consortium
BIND9 June 30, 2000 RNDC(8)