實驗：正向主DNS實現 實驗：反向解析DNS 實驗：從DNS服務器實現

實驗：正向主DNS實現
實驗：反向解析DNS

實驗：從DNS服務器實現

在主服務器
vim /etc/named.conf
allow-transfer { slaveip;}; 加此行
從服務器
vim /etc/named.conf
allow-transfer { none;}; 加此行

vim /etc/named.rfc1912.zones
zone “magedu.com” IN {
type slave;
masters { masterip; };
file “slaves/magedu.com.zone.slave”;
};

www.bj.magedu.com.
ftp.bj.magedu.com
www.zz.magedu.com.

實驗：實現子域

1 當成記錄
2 子域，本機獨立域
3 委派給另一臺主機維護子域

在父域DNS
vim /etc/named.conf
dnssec-enable no;
dnssec-validation no;

vim /var/named/magedu.com.zone
vim magedu.com.zone
$TTL 86400
@ IN SOA dns1.magedu.com. admin.magedu.com. (
2018060125 ; serial
86400 ; refresh (1 day)
3600 ; retry (1 hour)
259200 ; expire (3 days)
3600 ; minimum (1 hour)
)
NS dns1.magedu.com.
bj NS dns2.magedu.com. ##
dns1 A 192.168.30.7
dns2 A 192.168.30.17 ##

在子域服務器建bj.magedu.com即可

實驗：forward 轉發

實驗：實現智能DNS

1 vim /etc/named.conf
acl beijingnet {
192.168.30.0/24;
};
acl shanghainet {
172.20.0.0/16;

};
acl othernet {
any;
};

options {
listen-on port 53 { localhost; };
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”;
allow-query { any; };
allow-transfer { 192.168.30.17;192.168.30.27;};

recursion yes;

dnssec-enable no;
dnssec-validation no;

/* Path to ISC DLV key */
bindkeys-file “/etc/named.iscdlv.key”;

managed-keys-directory “/var/named/dynamic”;

pid-file “/run/named/named.pid”;
session-keyfile “/run/named/session.key”;
};

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

view beijingview {
match-clients {beijingnet;};
include “/etc/named.rfc1912.zones.bj”;
};
view shanghaiview {
match-clients {shanghainet;};
zone “magedu.com” {
type master;
file “magedu.com.zone.sh”;
};

};
view otherview {
match-clients {othernet;};
include “/etc/named.rfc1912.zones”;
};
include “/etc/named.root.key”;

cat /etc/named.rfc1912.zones
zone “.” IN {
type hint;
file “named.ca”;
};
zone “magedu.com” IN {
type master;
file “magedu.com.zone”;
allow-transfer { 192.168.30.17;};
};

cat /etc/named.rfc1912.zones.bj
zone “.” IN {
type hint;
file “named.ca”;
};
zone “magedu.com” IN {
type master;
file “magedu.com.zone.bj”;
};

cat /var/named/magedu.com.zone.bj
$TTL 86400
@ IN SOA dns1.magedu.com. admin.magedu.com. (
2018060125 ; serial
86400 ; refresh (1 day)
3600 ; retry (1 hour)
259200 ; expire (3 days)
3600 ; minimum (1 hour)
)
NS dns1.magedu.com.
bj NS dns2.magedu.com.
dns1 A 192.168.30.7
dns2 A 192.168.30.17
websrv A 192.168.30.1
dbsrv A 192.168.30.27
mailsrv A 6.6.6.6
appsrv A 5.5.5.5
www CNAME websrv

[root@centos7 named]#cat /var/named/magedu.com.zone.sh
$TTL 86400
@ IN SOA dns1.magedu.com. admin.magedu.com. (
2018060125 ; serial
86400 ; refresh (1 day)
3600 ; retry (1 hour)
259200 ; expire (3 days)
3600 ; minimum (1 hour)
)
NS dns1.magedu.com.
bj NS dns2.magedu.com.
dns1 A 192.168.30.7
dns2 A 192.168.30.17
websrv A 192.168.30.2
dbsrv A 192.168.30.27
mailsrv A 6.6.6.6
appsrv A 5.5.5.5
www CNAME websrv

[root@centos7 named]#cat /var/named/magedu.com.zone
$TTL 86400
@ IN SOA dns1.magedu.com. admin.magedu.com. (
2018060125 ; serial
86400 ; refresh (1 day)
3600 ; retry (1 hour)
259200 ; expire (3 days)
3600 ; minimum (1 hour)
)
NS dns1.magedu.com.
bj NS dns2.magedu.com.
dns1 A 192.168.30.7
dns2 A 192.168.30.17
websrv A 192.168.30.3
dbsrv A 192.168.30.27
mailsrv A 6.6.6.6
appsrv A 5.5.5.5
www CNAME websrv