DNS服务子域委派，授权解析，负载均衡等功能原理解析实验（欢迎各位朋友莅临指教讨论）
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一、DNS服务器简易架构图
二、实验操作步骤
~~~~~~~~~~~~~~~~1、设置客户端域名解析，使之指向缓存服务器~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[[email protected] ~]# cat /etc/resolv.conf
; generated by /usr/sbin/dhclient-script
search localdomain
nameserver 172.168.3.133
~~~~~~~~~~~~~~~~2、修改缓存服务器主配置文件的内容，使之实现转发功能~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[[email protected] ~]# cat /etc/named.conf
options
{
directory "/var/named"; //"Working" directory
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";
listen-on port 53 { 172.168.3.133; };
allow-query { any; };
recursion yes;
pid-file "/run/named/named.pid";
dnssec-enable yes;
dnssec-validation yes;
session-keyfile "/run/named/session.key";
managed-keys-directory "/var/named/dynamic";
forward only;
forwarders { 172.168.3.134; };
};
logging
{
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
~~~~~~~~~~~~~~~~3、修改根域服务器主配置文件，并授权com/net子域~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
（1）、修改主配置文件，创建区域配置文件
[[email protected] named]# cat /etc/named.conf
options
{
directory "/var/named"; //"Working" directory
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";
listen-on port 53 { 172.168.3.134; };
allow-query { any; };
recursion yes;
pid-file "/run/named/named.pid";
dnssec-enable yes;
dnssec-validation yes;
session-keyfile "/run/named/session.key";
managed-keys-directory "/var/named/dynamic";
};
logging
{
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
zone "." IN {
type master;
file "root.zone";
};
（2）创建区域配置文件，并授权com/net域
[[email protected] named]# cat root.zone
$TTL 300
@ IN SOA root.zone.com treey.qq.com. (
0 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
@ IN NS root.gz.com.
root.gz.com IN A 172.168.3.134
com. IN NS DNS129.gz.com. ###授权子域过程
DNS129.gz.com. IN A 172.168.3.129
net. IN NS DNS129.gz.com.
DNS129.gz.com. IN A 172.168.3.129
~~~~~~~~~~~~~~~~4、修改com/net域服务器主配置文件，并授权企业DNS服务器子域~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
（1）、修改主配置文件，创建区域配置文件
[[email protected] named]# cat /etc/named.conf
options
{
directory "/var/named"; //"Working" directory
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";
listen-on port 53 { 172.168.3.129; };
allow-query { any; };
recursion yes;
pid-file "/run/named/named.pid";
dnssec-enable yes;
dnssec-validation yes;
session-keyfile "/run/named/session.key";
managed-keys-directory "/var/named/dynamic";
};
logging
{
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
zone "com." IN {
type master;
file "com.zone";
};
zone "net." IN {
type master;
file "net.zone";
（2）创建区域配置文件，并授权子域
$TTL 1D
@ IN SOA jh jh.qq.com (
0 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
@ IN NS DNS129.gz.com.
DNS129.gz.com. IN A 172.168.3.129
myclass.com. IN NS DNS128.gz.com. ###授权子域
DNS128.gz.com. IN A 172.168.3.128
game.com. IN NS DNS128.gz.com.
DNS128.gz.com IN A 172.168.3.128
~~~~~~~~~~~~~~~~5、修改企业DNS服务器主配置文件，并在区域配置文件中解析子域IP~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
（1）、添加本服务器需解析的域名段
[[email protected] named]# cat /etc/named.conf
options
{
directory "/var/named"; //"Working" directory
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";
listen-on port 53 { 172.168.3.128; };
allow-query { any; };
recursion no;
pid-file "/run/named/named.pid";
dnssec-enable yes;
dnssec-validation yes;
session-keyfile "/run/named/session.key";
managed-keys-directory "/var/named/dynamic";
};
logging
{
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
zone "myclass.com" IN {
type master;
file "myclass.com.zone";
};
zone "game.com" IN {
type master;
file "game.com.zone";
};
zone "myclass.net" IN {
type master;
file "myclass.net.zone";
};
zone "game.net" IN {
type master;
file "game.net.zone";
（2）、解析com域中的game.com域
[[email protected] named]# cat game.com.zone
$TTL 1D
@ IN SOA DNS128.gz.com. class.gz.com. (
0 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
@ IN NS DNS128.gz.com.
DNS128 IN A 172.168.3.128
www IN A 192.168.30.10 ###域名解析至端，并且实现负载均衡
www IN A 192.168.30.9
www IN A 192.168.30.8
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
以上内容若有瑕疵或者错误，望各位朋友不吝指教，大家互相学习，讨论！谢谢~~~~~~！
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