linux DNS快取記憶體

配置名稱伺服器(本機ip：172.25.254.117)

1 安裝 bind 軟體包

– yum install -y bind

listen-on port 53 ;     ##開啟埠

allow-query ; ##允許訪問
forwarders ; ##如果伺服器沒有這個位址就去訪問250

systemctl start named

systemctl enable named
firewall-cmd
--permanent --add-server
=dns
firewall-cmd
--reload
firewall-cmd
--list
-all
netstat -antlupe
|grep 53

vim /etc/resolve.conf

nameserver 172.25
.254
.117
• 進行測試
dns正向解析
vim /etc/named.conf

forwarders ; ##刪除這一行自己搭建乙個dns
vim /etc/named.rfc1912.zones
zone "westos.com"
in ;
cd /var/named/
cp -p named.localhost westos.com
.zone
vim westos.com
.zone
1 $ttl 1d
2 @ in soa westos.com
.zone. root.westos
.com. ( ##@如果後面不加. 自動補齊westos.com30
; serial
41d ; refresh
51h ; retry
61w ; expire
73h ) ; minimum
8 ns dns.westos
.com.
9 dns a 172.25
.254
.117
10 www a 172.25
.254
.111
systemctl restart named
測試：dig www.westos.com 

@@@如果想讓dns伺服器實現輪詢： 
dns反向解析
vim /etc/named.rfc1912.zones

47 zone "254.25.172.in-addr.arpa"
in ;
51 };
cp -p named.loopback westos.com
.ptr
vim westos.com
.ptr
1 $ttl 1d
2 @ in soa dns.westos
.com. root.westos
.com. (
30; serial
41d ; refresh
51h ; retry
61w ; expire
73h ) ; minimum
8 ns dns.westos
.com.
9 dns a 172.25
.254
.117
10111 ptr www.westos
.com.
11222 ptr sjw.westos
.com.
systemctl restart named
測試：dig -x 172.25.254.111 

dig -x 172.25.254.222 
雙向解析
cp -p westos.com

.zone westos.com
.inter
vim westos.com
.inter 
%s/172.25
.254/192.25
.254/g
cp /etc/named.rfc1912.zones /etc/named.rfc1912.zones
.inter -p
vim named.rfc1912.zones
.inter
24 zone "westos.com"
in ;
28 };
vim named.conf
50#zone "." in ;54#
55#include "/etc/named.rfc1912.zones";
56#include "/etc/named.root.key";57#
58 view localnet; ##這裡填的是localhost
60 zone "."
in;64 include "/etc/named.rfc1912.zones.inter"
;65 };
6667 view internet;
69 zone "."
in;73 include "/etc/named.rfc1912.zones"
;74 };
vim /etc/resolv.conf 
nameserver 172.25
.254
.217
測試： 

在內網和外網測試dig www.westos.com
 
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