配置DNS的實例:
1 所需配置文件:
/etc/named.conf 系統自帶，需要配置
/etc/resolv.conf 系統自帶，需要配置
/var/named/myqmail.com.db 系統沒有，自已創建
/var/named/db.192.168.0.198 系統沒有，自已創建
/var/named/named.local 系統自帶，不需要修改
/var/named/named.ca 系統自帶，不需要修改
2 相關工具
nslookup
說明：檢測DNS是否配置正確的工具，系統自帶。
3 配置方案
3.1 /etc/named.conf
說明：DNS主配置文件，定義了域數據庫信息的基本參數和源點，該文件可以存放在本地或遠程的服務器上。源文件：
// generated by named-bootconf.pl
options {
directory "/var/named";
/*
* If there is a firewall between you and nameservers you want
* to talk to, you might need to uncomment the query-source
* directive below. Previous versions of BIND always asked
* questions using port 53, but BIND 8.1 uses an unprivileged
* port by default.
*/
// query-source address * port 53;
};
//
// a caching only nameserver config
//
controls {
inet 127.0.0.1 allow { localhost; } keys { rndckey; };
};
zone "." IN {
type hint;
file "named.ca";
};
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 "myqmail.com" IN {
type master;
file "myqmail.com.db";
allow-update { none;};
};
zone "0.168.192.in-addr.arpa" IN{
type master;
file "db.192.168.0.198";
allow-update { none;};
};
include "/etc/rndc.key";
3.2 /var/named/myqmail.com.db
說明：正向解析配置文件,即實現域名到IP的對應。源文件：
$TTL 86400
@ IN SOA www.myqmail.com. myqmail.com. (
2002103000 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS www.myqmail.com.
localhost IN A 127.0.0.1
www IN A 192.168.0.198
3.3 /var/named/db.192.168.0.198
說明：DNS反向解析配置文件，即實現IP地址很域名的映射。源文件：
$TTL 86400
@ IN SOA www.myqmail.com. myqmail.com. (
2002103000 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS www.myqmail.com.
198 IN PTR www.myqmail.com.
3.4 /etc/resolv.conf
說明：指定域名服務器的IP和搜索順序。源文件：
search myqmail.com
nameserver 192.168.0.198
4 測試及管理辦法
4.1 測試方法
1. 修改完DNS的配置文件，需要執行/etc/rc.d/init.d/named restart來使更改生效。
2. nslookup：測試正向、反向的解析是否正常
5 小結
DNS服務是許多服務的基礎，所以我剛開始linux服務器時,就著手配置DNS服務器。DNS是用在局域網中，不連接Internet，僅僅限于局域網中為各個部門的各主機及服務器作解析用。
