Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 235)

Chapter 17. Berkeley Internet Name Domain (BIND) 235

If the command was not successful, carefully go over the /etc/named.conf and /etc/rndc.conf

ﬁles and look for errors.

Caution

You should make sure that unprivileged users cannot read or write the /etc/rndc.conf ﬁle.

17.3.2. Command Line Options

An rndc command takes the following form:

rndc options command command-options

Figure 17-26. Structure of a rndc command

The options area is not required, and you do not have to use command-options unless the

command requires them.

When executing rndc on a properly conﬁgured localhost, the following commands are available:

• halt — Stops the named service immediately.

• querylog — Turns on logging of all queries made by clients to this nameserver.

• refresh — Refreshes the nameserver’s database.

• reload — Tells the nameserver to reload the zone ﬁles but keep all other previously cached re-

sponses. This allows you to make changes to zone ﬁles and have them take effect on your master

and slave servers without losing all stored name resolutions.

If your changes only affected a particular zone, you can tell named to only reload that one zone.

Type the name of the zone after the reload command.

• stats — Dumps the current named stats to the /var/named/named.stats ﬁle.

• stop — Stops the server gracefully, saving any dynamic update and IXFR data before exiting.

Occasionally, you may want to override the default settings in the /etc/rndc.conf ﬁle. The follow-

ing options are available:

• -c

configuration-file — Tells rndc to use a conﬁguration ﬁle other than the default

/etc/rndc.conf.

• -p

port-number — Speciﬁes a different port number to use for the rndc connection other

than the default 953.

• -s

server — Tells rndc to send the command to a server other than the default-server

option in /etc/rndc.conf ﬁle.

In order for this to work, you must have conﬁgured the other named service to accept commands

from your host and have the key for that nameservice.

• -y key-name — Allows you to specify a key other than the default-key option in

/etc/rndc.conf ﬁle.

Additional information about these options can be found in the rndc man page.

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 235