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

2 編輯 /etc/named.conf

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

3 啟動並啟用 dns 伺服器

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

4配置其他兩台機器dns

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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