DNS客户端：10.0.0.6/24
本地DNS服务器（只缓存）：10.0.0.8/24
转发目标DNS服务器：10.0.0.18/24
根DNS服务器:10.0.0.28/24
org域DNS服务器：10.0.0.38/24
magedu.org域主DNS服务器：10.0.0.48/24
magedu.org域从DNS服务器：10.0.0.58/24
www。magedu.org的WEB服务器：10.0.0.68/24
在客户端配置DNS服务器地址(10.0.0.6)
[root@localhost ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0
[root@localhost ~]# service network restart
10.0.0.68(web服务器)
[13:25:21 root@centos8 ~]$yum -y install httpd
[14:27:02 root@centos8 ~]$ echo www.magedu,org > /var/www/html/index.html
[14:30:42 root@centos8 ~]$ systemctl start httpd
10.0.0.48（主DNS服务器）
[13:22:56 root@centos8 ~]$ yum -y install bind
[14:35:29 root@centos8 ~]$ vim /etc/named.conf
[14:43:40 root@centos8 ~]$ vim /etc/named.rfc1912.zones
[14:46:45 root@centos8 ~]$named –checkconf
[14:46:59 root@centos8 ~]$ vim /var/named/magedu.org.zone
[14:53:25 root@centos8 ~]$named –checkconf
[14:53:57 root@centos8 ~]$ chgrp named /var/named/magedu.org.zone
[14:54:51 root@centos8 ~]$ systemctl start named
10.0.0.58（从DNS服务器）
[13:24:10 root@centos8 ~]$yum -y install bind
[15:03:29 root@centos8 ~]$ vim /etc/named.conf
[15:06:34 root@centos8 ~]$ named –checkconf
[15:06:46 root@centos8 ~]$ vim /etc/named.rfc1912.zones
[15:15:13 root@centos8 ~]$ named –checkconf
[15:46:15 root@centos8 ~]$ systemctl start named
[15:47:52 root@centos8 ~]$ ls /var/named/slaves
magedu.org.slave
10.0.0.38（org域DNS服务器）
[13:21:38 root@centos8 ~]$ yum -y install bind
[15:56:37 root@centos8 ~]$ vim /etc/named.conf
[15:58:25 root@centos8 ~]$ vim /etc/named.rfc1912.zones
[16:01:26 root@centos8 ~]$named –checkconf
[16:01:38 root@centos8 ~]$ vim /var/named/org.zone
[16:09:24 root@centos8 ~]$chgrp named /var/named/org.zone
[16:10:12 root@centos8 ~]$systemctl start named
10.0.0.28（根DNS服务器）
[16:11:55 root@centos8 ~]$ yum -y install bind
[16:19:28 root@centos8 ~]$ vim /etc/named.conf
[16:24:24 root@centos8 ~]$ vim /var/named/root.zone
[16:29:25 root@centos8 ~]$chgrp named /var/named/root.zone
[16:30:16 root@centos8 ~]$chmod 640 /var/named/root.zone
[16:47:25 root@centos8 ~]$systemctl start named
10.0.0.18（转发目标DNS服务器）
[13:17:55 root@centos8 ~]$yum -y install bind
[16:53:00 root@centos8 ~]$ vim /etc/named.conf
[16:57:06 root@centos8 ~]$ vim /var/named/named.ca
[17:12:57 root@centos8 ~]$systemctl start named
10.0.0.8（本地缓存DNS服务器）
[17:15:19 root@centos8 ~]$yum -y install bind
[17:21:47 root@centos8 ~]$ vim /etc/named.conf
[17:34:44 root@centos8 ~]$systemctl start named
10.0.0.6
17:41:40 root@centos8 ~]$ cat /etc/resolv.conf
# Generated by NetworkManager
search magedu.com
nameserver 10.0.0.8
[17:43:41 root@centos8 ~]$yum -y install bind-utils
[18:12:13 root@centos8 ~]$dig www.magedu.org
; <<>> DiG 9.11.26-RedHat-9.11.26-4.el8_4 <<>> www.magedu.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 61477
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; cookie: 4f27fcfd1c85d10c2f5bd5a8618b9b28e2bf30c4ea5e9128 (good)
;; QUESTION SECTION:
;www.magedu.org. IN A
;; Query time: 0 msec
;; SERVER: 10.0.0.8#53(10.0.0.8)
;; WHEN: Wed Nov 10 18:12:50 CST 2021
;; MSG SIZE rcvd: 71
