步骤：
1.安装软件
2.配置缓存DNS服务
3.配置主DNS
4.配置辅DNS
实践：
1.安装软件
相关软件包bind bind-utils bind-chroot caching-nameserver
#yum install bind bind-utils bind-chroot caching-nameserver
2.配置缓存DNS服务
#cd /var/name/chroot/etc
#mv mv named.caching-nameserver.conf named.conf
修改配置/var/name/chroot/etc/name.conf
（1）listen-on port 53 { any; }; 任意机器都监听53端口
（2）allow-query { any; }; 允许的机器
allow-query-cache { any; }; 允许缓存
（3）match-clients { any; };
recursion yes; 递归
forward first; 进行转发，先转发到222.246.129.80上
forwarders { 222.246.129.80;};
3.配置主DNS
（1）修改配置/var/name/chroot/etc/name.conf
#include "/etc/named.rfc1912.zones";----> include "/etc/named.zones" 创建DNS域配置文件
（2）修改主域配置文件
#cd /var/named/chroot/etc
#mv named.rfc1912.zones named.zones
#vi named.zones
追加
zone "ds.com" IN {
type master;
file "ds.com.zone"; 定义正向解析文件
allow-update { none; };
};
zone "137.168.192.in-addr.arpa" IN {
type master;
file "192.168.137.zone"; 定义反向解析文件
allow-update { none; };
};
（3）配置解析文件
#cd /var/namd/chroot/var/named
配置正向解析文件
#cp -pv localhost.zone ds.com.zone 复制已有的模版进行修改
#vi ds.com.zone
$TTL 86400
@ IN SOA ns1.ds.com. root.ds.com. (
1997022700 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS ns1.ds.com.
IN MX 10 mail.ds.com.
ns1 IN A 192.168.137.2
mail IN A 192.168.137.2
配置正向解析文件
#cp -pv ds.com.zone 192.168.137.zone
#vi 192.168.137.zone
$TTL 86400
@ IN SOA ns1.ds.com. root.ds.com. (
1997022700 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS ns1.ds.com.
IN MX 10 mail.ds.com.
2 IN PTR ns1.ds.com.
2 IN PTR mail.ds.com.
(4)重启服务测试
#/etc/init.d/named restart
修改客户端服务器DNS为配置的DNS主机地址
#nslookup
>set type=mx
>ds.com 测试正向解析
#set type=ptr
>192.168.137.2
4.配置辅DNS
（1）主DNS上的配置
修改/var/named/chroot/etc/named.zone
zone "ds.com" IN {
type master;
file "ds.com.zone";
allow-update { none; };
allow-transfer { 192.168.137.3; }; 允许与辅DNS传输
};
zone "137.168.192.in-addr.arpa" IN {
type master;
file "192.168.137.zone";
allow-update { none; };
allow-transfer { 192.168.137.3; };
};
修改/var/named/chroot/var/named/ds.com.zone
$TTL 86400
@ IN SOA ns1.ds.com. root.ds.com. (
1997022700 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS ns1.ds.com.
IN NS ns2.ds.com.
IN MX 10 mail.ds.com.
ns1 IN A 192.168.137.2
ns2 IN A 192.168.137.3
mail IN A 192.168.137.2
修改/var/named/chroot/var/named/192.168.137.zone
$TTL 86400
@ IN SOA ns1.ds.com. root.ds.com. (
1997022700 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS ns1.ds.com.
IN NS ns2.ds.com.
IN MX 10 mail.ds.com.
2 IN PTR ns1.ds.com.
3 IN PTR ns2.ds.com.
2 IN PTR mail.ds.com.
（2）辅DNS配置
修改/var/named/chroot/etc/named.conf
（1）listen-on port 53 { any; }; 任意机器都监听53端口
（2）allow-query { any; }; 允许的机器
allow-query-cache { any; }; 允许缓存
（3）match-clients { any; };
recursion yes;
修改/var/named/chroot/etc/named.zone
zone "ds.com" IN {
type salve;
file "salves/ds.com.zone";
allow-update { none; };
};
zone "137.168.192.in-addr.arpa" IN {
type salve;
file "salves/192.168.137.zone";
allow-update { none; };
};
（3）启动dns服务查看/var/named/chroot/var/named/slaves文件下是否有ds.com.zone和192.168.137.zone两个配置文件
5.同步解析文件
修改主DNS解析文件下“1997022700 ; Serial”的值每次增加1重启主dns服务
