代码分享：DNS负载均衡设置

前面我们学习了DNS负载均衡的基本知识，后来又对它的优缺点进行了总结和归纳。现在我们了解到，DNS负载均衡的配置相对来说比较简单，容易实现。但是它的缺点就是需要更新，而且出现故障问题就需要大量时间来修复。那么现在，我们就来对DNS负载均衡设置过程进行一个介绍。

DNS负载均衡设置一：

root@localhost ~]# vi /etc/named.conf
//
// named.conf for Red Hat caching-nameserver 
//
options {
 directory "/var/named";
 dump-file "/var/named/data/cache_dump.db";
 statistics-file "/var/named/data/named_stats.txt";
};
controls {
 inet 127.0.0.1 allow { localhost; } keys { rndckey; };
};
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 "ox.com" {
 type master ;
 file "ox.zone";
};
zone "0.168.192.in-addr.arpa" {
 type master ;
 file "named.ox";
 };
include "/etc/rndc.key";

#p#DNS负载均衡设置二：

[root@localhost ~]# vi /var/named/chroot/var/named/ox.zone
$TTL 86400
@ IN SOA dns.ox.com root (
 192 ;serial (d. adams)
 3H ;refresh
 15M ;retry
 1W ;expiry
 1D ) ;minimum
@ IN NS dns.ox.com.
dns IN A 192.168.0.1
www IN A 192.168.0.6
www IN A 192.168.0.7
www IN A 192.168.0.8

DNS负载均衡设置三：

[root@localhost ~]# nslookup www.ox.com
Server: 192.168.0.1
Address: 192.168.0.1#53
Name: www.ox.com
Address: 192.168.0.8
Name: www.ox.com
Address: 192.168.0.6
Name: www.ox.com
Address: 192.168.0.7