RedHat EL5  DNS 配置
在RedHat EL5下配置DNS服务：
一、安装 bind（与 RedHat EL4安装方法一样）
二、配置
   1、在/etc没有了named.conf 文件，而是多了以下两个文件：
//
// named.caching-nameserver.conf
//
// Provided by Red Hat caching-nameserver package to configure the
// ISC BIND named(8) DNS server as a caching only nameserver
// (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//
// DO NOT EDIT THIS FILE - use system-config-bind or an editor
// to create named.conf - edits to this file will be lost on
// caching-nameserver package upgrade.
//
options {
 listen-on port 53 { 127.0.0.1; };
 listen-on-v6 port 53 { ::1; };
 directory  "/var/named";
 dump-file  "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        memstatistics-file "/var/named/data/named_mem_stats.txt";
 query-source    port 53; 
 query-source-v6 port 53;
 allow-query     { localhost; };
};
logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};
view localhost_resolver {
 match-clients     { localhost; };
 match-destinations { localhost; };
 recursion yes;
 include "/etc/named.rfc1912.zones";  //调用named.rfc1912.zones
};
// named.rfc1912.zones:   //添加解析区域
//
// Provided by Red Hat caching-nameserver package
//
// ISC BIND named zone configuration for zones recommended by
// RFC 1912 section 4.1 : localhost TLDs and address zones
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//
zone "." IN {
 type hint;
 file "named.ca";
};
zone "localdomain" IN {
 type master;
 file "localdomain.zone";
 allow-update { none; };
};
zone "localhost" IN {
 type master;
 file "localhost.zone";
 allow-update { none; };
};
zone "0.0.127.in-addr.arpa" IN {
 type master;
 file "named.local";
 allow-update { none; };
};
zone "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa" IN {
        type master;
 file "named.ip6.local";
 allow-update { none; };
};
zone "255.in-addr.arpa" IN {
 type master;
 file "named.broadcast";
 allow-update { none; };
};
zone "0.in-addr.arpa" IN {
 type master;
 file "named.zero";
 allow-update { none; };
};

zone "benet.com" IN {
 type master;
 file "named.benet";
 allow-update { none; };
};
zone "0.168.192.in-addr.arpa" IN {
 type master;
 file "named.192";
 allow-update { none; };
};
    2、在/var/named/chroot/var/named 下建立解析库文件
三、注意事项
    在建立解析库文件时，其文件所属用户和组均为root，在启动named时，日志提示“权限不够。。。”，后将两个解析库文件组改为named ，问题解决。