RHEL5.x上实现简单的dns解析

   在rhel5.x上实现简单的dns服务器解析

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一.安装软件包这里使用yum安装
1.  配置本地yum源并安装所需软件包

#mount /dev/cdrom /media
#vim /etc/yum.repos.d/local.repo #添加一下内容
[base]
name=Server
baseurl=file:///media/Server
enabled=1

#yum -y install bind.i* bind-devel bind-chroot caching-nameserver

二.配置DNS服务
1  .编辑dns主配置文件

#cd /var/named/chroot/etc
#cp -p named.caching-nameserver.conf named.conf
#vim named.conf

options {
        listen-on port 53 { any; };
        listen-on-v6 port 53 { ::1; };
        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";

        // Those options should be used carefully because they disable port
        // randomization
        // query-source    port 53;
        // query-source-v6 port 53;

        allow-query     { any; };
        allow-query-cache { any; };
};
logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};
view localhost_resolver {
        match-clients      { any; };
        match-destinations { any; };
        recursion yes;
        include "/etc/named.zones";
};

2.  编辑区域配置文件,也就是上面的named.zones

#cp -p named.rfc1912.zones named.zones
#vim named.zones #内容如下
zone "andy.com" IN {
    type master;
    file "andy.zone";
    allow-update { none; };
};
zone "155.16.172.in-addr.arpa" IN {
    type master;
    file "155.16.172.local";
    allow-update { none; };
};

3.  编辑区域数据库文件也就是正向解析和反向解析配置文件

#cd /var/named/chroot/var/named
#cp -p localhost.zone andy.zone
#vim andy.zone  内容如下 当然也可以根据自己的需要修改
$TTL    86400
@               IN SOA  dns.andy.com.       root.andy.com. (
                                        42              ; serial (d. adams)
                                        3H              ; refresh
                                        15M             ; retry
                                        1W              ; expiry
                                        1D )            ; minimum

                IN NS           dns.andy.com.
dns             IN A            172.16.155.1

#cp -p named.local 155.16.172.local
#vim 155.16.172.local  内容如下 也可以根据自己的需要修改
$TTL    86400
@       IN      SOA     dns.andy.com. root.andy.com.  (
                                      2012062500 ; Serial
                                      28800      ; Refresh
                                      14400      ; Retry
                                      3600000    ; Expire
                                      86400 )    ; Minimum
        IN      NS      dns.andy.com.
1       IN      PTR     dns.andy.com.

三.启动服务并设为下次开机自启  防火墙开启的话还要放行udp的53号端口这里就直接      关闭防火墙了

#service iptables stop
#chkconfig iptables off
#service named start
#chkconfig named on

四.测试, 客户端要修改/etc/resolv.conf文件,这里就使用本地做测试,本地服务器用修改那     个文件,这里修改下也没关系
1  .修改客户端dns服务器指向配置文件

#vim /etc/resolv.conf 内容如下
nameserver 172.16.155.1

2. 测试, 测试命令使用nslookup 后面跟域名

#nslookup dns.andy.com   正向解析测试
Server:     172.16.155.1
Address:    172.16.155.1#53

Name:   dns.andy.com
Address: 172.16.155.1

#nslookup 172.16.155.1   反向解析测试
Server:     172.16.155.1
Address:    172.16.155.1#53

1.155.16.172.in-addr.arpa   name = dns.andy.com.

上面可以看到正向解析dns.andy.com的域名解析出来的ip地址是172.16.155.1
反向解析172.16.155.1的IP地址解析出来的域名是dns.andy.com
ok 测试是正常的....................