linux DNS高速缓存

本文主要是介绍linux DNS高速缓存，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

配置名称服务器(本机ip：172.25.254.117)
1 安装 bind 软件包

– yum install -y bind

2 编辑 /etc/named.conf

    listen-on port 53 { any; };     ##开启端口allow-query { any; };           ##允许访问forwarders { 172.25.254.250; };     ##如果服务器没有这个地址就去访问250

3 启动并启用 DNS 服务器

 systemctl start namedsystemctl enable namedfirewall-cmd --permanent --add-server=dnsfirewall-cmd --reloadfirewall-cmd --list-allnetstat -antlupe|grep 53

4配置其他两台机器dns

vim /etc/resolve.confnameserver 172.25.254.117
• 进行测试
– dig www.baidu.com

DNS正向解析

vim /etc/named.confforwarders { 172.25.254.250; };     ##删除这一行自己搭建一个DNS
vim /etc/named.rfc1912.zoneszone "westos.com" IN {type master;file "westos.com.zone";allow-update { none; };
cd /var/named/
cp -p named.localhost westos.com.zone
vim westos.com.zone1 $TTL 1D2 @       IN SOA   westos.com.zone. root.westos.com. (    ##@如果后面不加. 自动补齐westos.com3                                         0       ; serial4                                         1D      ; refresh5                                         1H      ; retry6                                         1W      ; expire7                                         3H )    ; minimum8         NS      dns.westos.com.9 dns     A       172.25.254.11710 www     A       172.25.254.111
systemctl restart named

测试：dig www.westos.com
@@@如果想让DNS服务器实现轮询：
vim westos.com.zone
10 www CNAME sjw.westos.com.
11 sjw A 172.25.254.111
12 sjw A 172.25.254.222
systemctl restart named

DNS反向解析

vim /etc/named.rfc1912.zones 47 zone "254.25.172.in-addr.arpa" IN {48          type master;49          file "westos.com.ptr";50          allow-update { none; };51 };
cp -p named.loopback westos.com.ptr
vim westos.com.ptr1 $TTL 1D2 @       IN SOA  dns.westos.com. root.westos.com. (3                                         0       ; serial4                                         1D      ; refresh5                                         1H      ; retry6                                         1W      ; expire7                                         3H )    ; minimum8         NS      dns.westos.com.9 dns     A       172.25.254.11710 111     PTR     www.westos.com.11 222     PTR     sjw.westos.com.
systemctl restart named

测试：dig -x 172.25.254.111
dig -x 172.25.254.222
双向解析

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 {25         type master;26         file "westos.com.inter";27         allow-update { none; };28  };
vim named.conf 50 #zone "." IN {51 #       type hint;52 #       file "named.ca";53 #};54 #55 #include "/etc/named.rfc1912.zones";56 #include "/etc/named.root.key";57 #58 view localnet{59         match-clients {172.25.254.117; };   ##这里填的是localhost60         zone "." IN{61         type hint;62         file "named.ca";63         };64 include "/etc/named.rfc1912.zones.inter";65 };66 67 view internet{68          match-clients {any; };69          zone "." IN{70          type hint;71          file "named.ca";72          };73  include "/etc/named.rfc1912.zones";74  };vim /etc/resolv.conf 
nameserver 172.25.254.217

测试：
在内网和外网测试dig www.westos.com

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