Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 223)

Chapter 17. Berkeley Internet Name Domain (BIND) 223

Warning

Do not manually edit the /etc/named.conf ﬁle or any ﬁles in the /var/named/ directory if you are

using the BIND Conﬁguration Tool. Any manual changes to those ﬁles will be overwritten the next

time the BIND Conﬁguration Tool is used.

The /etc/named.conf ﬁle must be free of errors in order for named to start. While some erroneous

options used in with some statements are not considered critical enough to stop the server, any errors

in the statements themselves will prevent the named service from starting.

17.2.1. /etc/named.conf

The /etc/named.conf ﬁle is a collection of statements using nested options placed in ellipses { }.

A sample /etc/named.conf ﬁle is organized similar to Figure 17-2.

statement-1 [" statement-1-name "] [ statement-1-class ] {

option-1 ;

option-2 ;

option-N ;

};

statement-2 [" statement-2-name "] [ statement-2-class ] {

option-1 ;

option-2 ;

option-N ;

};

statement-N [" statement-N-name "] [ statement-N-class ] {

option-1 ;

option-2 ;

option-N ;

};

Figure 17-2. Sample organization of /etc/named.conf

The " statement-name " is only needed with acl, include, server, view, and zone state-

ments. The

statement-N-class may only be speciﬁed with the zone statement.

Comments may be placed in /etc/named in nested C-style characters /* */ or after // and #

characters.

The following statements may be used in /etc/named.conf:

• acl

acl-name — Conﬁgures an access control list of IP addresses to be allowed or disallowed

certain named services. Most of the time, individual IP addresses or IP network notation (such as

10.0.1.0/24) is used identify the exact IPs.

A few access control lists are already deﬁned, so you do not have to conﬁgure an acl statement to

deﬁne them:

• any — Matches every IP address.

• localhost — Matches any IP address in use by the local system.

• localnets — Matches any IP address on any network to which the local system is connected .

• none — Matches no IP addresses.

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 223

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