搭建DNS主从服务器实验

dns主服务器端
1.安装所需的软件（rhel5.5）

[root@rhel5 ~]# yum install bind* caching* -y
[root@rhel5 ~]# rpm -qa |grep bind

2.修改主配置文件named.conf

[root@rhel5 ~]# cd /var/named/chroot/etc/
[root@rhel5 etc]# vim named.conf
[root@rhel5 etc]# cat named.conf

options {
 directory  "/var/named";
 dump-file  "/var/named/data/cache_dump.db";
// recursion yes;          #默认递归查询
};
 include "/etc/named.rfc1912.zones";

zone "sw.com" IN {                 #正向解析
 type master;
 file "sw.com.zone";
};
zone "1.0.10.in-addr.arpa" IN {    #反向解析
 type master;
 file "10.0.1.zone";
};

3.创建zone配置文件

[root@rhel5 ~]# cd /var/named/chroot/var/named/
[root@rhel5 named]# vim sw.com.zone
[root@rhel5 named]# cat sw.com.zone

$TTL 86400
@       IN      SOA     rhel5.sw.com. root  (
                                      2013080601 ; Serial
                                      28800      ; Refresh
                                      14400      ; Retry
                                      3600000    ; Expire
                                      86400 )    ; Minimum
@       IN      NS      rhel5.sw.com.
@       IN      NS      sb.sw.com.

sb  IN A 10.0.1.18
@       IN      A       10.0.1.8
rhel5   IN      A       10.0.1.8
www     IN      A       10.0.1.8
rhel6   IN      A       10.0.1.88

[root@rhel5 named]# vim 10.0.1.zone
[root@rhel5 named]# cat 10.0.1.zone

$TTL 86400
@       IN      SOA     rhel5.sw.com. root  (
                                      2013080601 ; Serial
                                      28800      ; Refresh
                                      14400      ; Retry
                                      3600000    ; Expire
                                      86400 )    ; Minimum
@       IN      NS      rhel5.sw.com.
@       IN      NS      sb.sw.com.

8       IN      PTR     rhel5.sw.com.
18 IN  PTR sb.sw.com.
88      IN      PTR     rhel6.sw.com.

4.修改默认dns服务器地址

[root@rhel5 ~]# vim /etc/resolv.conf
[root@rhel5 ~]# cat /etc/resolv.conf
nameserver  10.0.1.8

#查看本机时间

[root@rhel5 ~]# date

2013年 08月 04日 星期日 15:21:45 CST

5.重启服务

[root@rhel5 ~]# service named restart
停止 named：                                               [确定]
启动 named：                                               [确定]

#开机自启动

[root@rhel5 ~]# chkconfig named on

DNS从服务器
1.安装所需软件

[root@sb ~]# yum install bind* -y
[root@sb ~]# yum install "wireshark*" -y

2.修改主配置文件

[root@sb ~]# cd /var/named/slaves/
[root@sb slaves]# vim /etc/named.conf
[root@sb slaves]# cat /etc/named.conf

options {
        directory       "/var/named";
};
zone "sw.com" IN {
        type slave; 
        file "slaves/sw.com.zone";
        masters {10.0.1.8;};
};
zone "1.0.10.in-addr.arpa" IN {
        type slave;
        file "slaves/10.0.1.zone";
        masters {10.0.1.8;};

3.主从同步时间

[root@sb ~]# yum install xinetd -y
[root@sb ~]# chkconfig time-stream on
[root@sb ~]# rdate -s 10.0.1.8
[root@sb ~]# date
2013年 08月 04日 星期日 15:23:19 CST

4.重启服务

[root@sb slaves]# service named restart
Stopping named:                                            [  OK  ]
Starting named:                                            [  OK  ]

#从主服务器同步两个zone文件
#以后主服务器做修改并且改大Serial，主服务器刷新服务，从服务器就会同步

[root@sb slaves]# ls
10.0.1.zone  sw.com.zone
[root@sb slaves]# pwd
/var/named/slaves

5.主从同步
下图为本次我用wireshark抓包同步的过程

dns客户端

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修改默认dns服务器地址

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[root@localhost ~]# vim /etc/resolv.conf
[root@localhost ~]# cat /etc/resolv.conf
nameserver  10.0.1.8

测试
#正向解析

[root@rhel6 ~]# nslookup www.sw.com
Server:  10.0.1.8
Address: 10.0.1.8#53
Name: www.sw.com
Address: 10.0.1.8

#逆向解析

[root@rhel6 ~]# nslookup 10.0.1.18
Server:  10.0.1.8
Address: 10.0.1.8#53
18.1.0.10.in-addr.arpa name = sb.sw.com.

#使用dns从服务器正向解析

[root@rhel6 ~]# nslookup rhel6.sw.com 10.0.1.18
Server:  10.0.1.18
Address: 10.0.1.18#53
Name: rhel6.sw.com
Address: 10.0.1.8

#解析网络域名

[root@localhost ~]# nslookup www.baidu.com
Server:  10.0.1.8
Address: 10.0.1.8#53
Non-authoritative answer:
www.baidu.com canonical name = www.a.shifen.com.
Name: www.a.shifen.com
Address: 115.239.210.27
Name: www.a.shifen.com
Address: 115.239.210.26