代码分享：DNS负载均衡设置-dns负载均衡

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