DNS

DNS分布式数据库，倒树结构

域名　　根域（.com/.edu）　　子域

13个根服务器

辅助服务器

解析客户机的查询请求

vim /etc/services　　953端口

rpm -ivh /mnt/Packages/bind-9.7.0-5.P2.el6.i686.rpm
rpm -ivh /mnt/Packages/bind-chroot-9.7.0-5.P2.el6.i686.rpm
rpm -ivh /mnt/Packages/bind-utils-9.7.0-5.P2.el6.i686.rpm

/etc/init.d/named restart

启动服务后/var/named/chroot 挂载

/etc/named.conf

DNS配置　　/etc/resolv.conf

　　　　　　vim 　ifcfg-eth0

-------------------------------------配置dns服务------------------------

vim /var/named/chroot/etc/named.conf

options {
        listen-on port 53 { any; };
        listen-on-v6 port 53 { any; };
        directory       "/var/named";
        dump-file       "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        listen-on port 53 { any; };
        listen-on-v6 port 53 { any; };
        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";
        allow-query     { any; };
        recursion yes;

        dnssec-enable yes;
        dnssec-validation yes;
        dnssec-lookaside auto;

        /* Path to ISC DLV key */
        bindkeys-file "/etc/named.iscdlv.key";
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

zone "." IN {
        type hint;
        file "named.ca";
};

zone "cmdns" IN {
        type master;
        file "cmdns.cn.zone";
};
include "/etc/named.rfc1912.zones";

配置cmdns.cn.zone　　/var/named/chroot/var/named/cmdns.cn.zone

$TTL 1D　　---------设置默认缓存记录1Day，根目录"."
cmdns.cn.       IN SOA  dns.cmdns.cn. root.cmdns.cn. (　　---域管理邮箱root.cmdns.cn(root@cmdns.cn)
                                        0       ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
cmdns.cn.       NS      dns.cmdns.cn.
dns.cmdns.cn.   A       192.168.153.128
www.cmdns.cn.   A       192.168.153.128
www1.cmdns.cn.  CNAME   www.cm.cn.