智能DNS搭建方案

智能DNS搭建方案智能DNS主要通过用户源IP来判断来源，然后根据不同的策略解析到不同的IP地址来实现。使得用户可以就近访问所需的资源，提高访问速度，提升用户感知。智能DNS可通过bind的view功能来实现。BIND的VIEW功能配置如下：软件版本：bind-9.9.5-P1.tar.gz依赖：gccopenssl-0.9.8zb.tar.gz（bind的DNSSEC需要） 1. 安装openssltar xf openssl-0.9.8zb.tar.gzcd openssl-0.9.8zb./config --prefix=/usr/local --openssldir=/usr/local/openssl && make && make install2. 安装bindtar xf bind-9.9.5-P1.tar.gzcd bind-9.9.5-P1./configure --prefix=/home/bind --enable-threads --with-openssl=/usr/local/opensslmake && make install3. 配置bind由于要配置view，那么所有的zone文件都必须放在view里面，所以做如下配置：注释掉named.conf中的named.conf.zone和named.rfc1912.zonesvi /home/bind/etc/named.conf#named.conf fileinclude "/home/bind/etc/named.conf.options";include "/home/bind/etc/named.conf.acl";include "/home/bind/etc/named.conf.controls";include "/home/bind/etc/named.conf.server";include "/home/bind/etc/named.conf.key";include "/home/bind/etc/named.conf.dlz";include "/home/bind/etc/named.conf.trusted-keys";include "/home/bind/etc/named.conf.view";#include "/home/bind/etc/named.conf.zone";#include "/home/bind/etc/named.rfc1912.zones"; 配置viewvi /home/bind/etc/named.conf.viewview "ctc_view_zone" { match-clients { CTC; }; include "/home/bind/var/named/view_zone/ctc_zone";}; view "cuc_view_zone" { match-clients { CUC; }; include "/home/bind/var/named/view_zone/cuc_zone";}; view "cmc_view_zone" { match-clients { CMC; }; include "/home/bind/var/named/view_zone/cmc_zone";}; view "any_view_zone" { match-clients { any; }; include "/home/bind/var/named/view_zone/any_zone";};分别为电信、联通、移动配置view，match-clients对应各自的ACL，实现筛选，include对应各自的zone配置文件。最后一条view为默认的view，view的匹配顺序是从上往下的，所以默认的view配置在最后。 配置zone文件在/home/bind/var/named/view_zone下创建各自对应的zone文件ls-l /home/bind/var/named/view_zonetotal 16-rw-r--r--. 1 root root 175 Aug 12 17:47 any_zone-rw-r--r--. 1 root root 175 Aug 13 17:22 cmc_zone-rw-r--r--. 1 root root 175 Aug 12 17:47 ctc_zone-rw-r--r--. 1 root root 175 Aug 12 18:18 cuc_zonevi /home/bind/var/named/view_zone/ctc_zonezone "." IN { type hint; file "/home/bind/var/named/named.ca";}; zone "test.com" IN { type master; file "/home/bind/var/named/ctc/test.com"; allow-update { none; };}; Vi /home/bind/var/named/view_zone/cuc_zonezone "." IN { type hint; file "/home/bind/var/named/named.ca";}; zone "test.com" IN { type master; file "/home/bind/var/named/cuc/test.com"; allow-update { none; };}; Vi /home/bind/var/named/view_zone/cmc_zonezone "." IN { type hint; file "/home/bind/var/named/named.ca";}; zone "test.com" IN { type master; file "/home/bind/var/named/cmc/test.com"; allow-update { none; };}; vi /home/bind/var/named/view_zone/any_zonezone "." IN { type hint; file "/home/bind/var/named/named.ca";}; zone "test.com" IN { type master; file "/home/bind/var/named/any/test.com"; allow-update { none; };}; 在对应的目录下配置zone数据文件,配置一条A记录便于测试vi /home/bind/var/named/ctc/test.com$TTL 86400@ IN SOA test.com. root.localhost. ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum IN NS nsns IN A 115.182.75.10www IN A 1.1.1.1 vi /home/bind/var/named/cuc/test.com$TTL 86400@ IN SOA test.com. root.localhost. ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum IN NS nsns IN A 115.182.75.10www IN A 2.2.2.2 vi /home/bind/var/named/cmc/test.com$TTL 86400@ IN SOA test.com. root.localhost. ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum IN NS nsns IN A 115.182.75.10www IN A 3.3.3.3 vi /home/bind/var/named/any/test.com$TTL 86400@ IN SOA test.com. root.localhost. ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum IN NS nsns IN A 115.182.75.10www IN A 4.4.4.4 配置ACL由于IP条目数较多，所以另外创建ACL的文件方便管理首先在named.conf中关联相应的文件vi /home/bind/etc/named.conf#named.conf fileinclude "/home/bind/etc/named.conf.options";include "/home/bind/etc/named.conf.acl";include "/home/bind/etc/named.conf.controls";include "/home/bind/etc/named.conf.server";include "/home/bind/etc/named.conf.key";include "/home/bind/etc/named.conf.dlz";include "/home/bind/etc/named.conf.trusted-keys";include "/home/bind/etc/named.conf.view";#include "/home/bind/etc/named.conf.zone";#include "/home/bind/etc/named.rfc1912.zones";include "/home/bind/etc/named.conf.log";include "/home/bind/etc/ACL/dianxinACL";include "/home/bind/etc/ACL/yidongACL";include "/home/bind/etc/ACL/liantongACL";include "/home/bind/etc/ACL/changkuanACL";include "/home/bind/etc/ACL/tietongACL";include "/home/bind/etc/ACL/jiaoyukeyanACL";每个文件对应相应的IP地址库格式为：acl “acl_name” { xx.xx.xx.xx; }; 如下所示：vi /home/bind/etc/ACL/yidongACLacl "CMC" {36.128.0.0/10;39.128.0.0/10;111.0.0.0/10;112.0.0.0/10;……221.176.0.0/13;223.64.0.0/10;};至此bind的view已经配置完成启动bind/home/bind/sbin/named -u root -c /home/bind/etc/named.conf(最好创建一个bind账号来启动，chown -R bind:bind /home/bind)ps –ef | grep named 查看服务是否启动使用/home/bind/sbin/named -u root -c /home/bind/etc/named.conf -g可以查看启动过程，方便排错 测试时，会根据源IP判断来源，然后解析到指定的地址，如下：域名 电信用户解析IP 联通用户解析IP 移动用户解析IP 其他用户解析IPwww.test.com 1.1.1.1 2.2.2.2 3.3.3.3 4.4.4.4 解析命令dig @115.182.75.10 www.test.com Anslookup www.test.com 115.182.75.10host -t A www.test.com 115.182.75.10 附上一个bind自带的压力测试工具queryperf在解压 bind-9.9.5-P1.tar.gz后，在解压的文件中有个queryperf的目录，具体路径为：bind-9.9.5-P1/contrib/queryperf在queryperf目录下执行：sh configure && make之后会生成一个queryperf执行文件基本用法如下：./queryperf -d domain-file -s 8.8.8.8 -l 60 -T100-d 后接一个域名列表文件，一行一个域名，格式为:domain typewww.163.com Aqq.com MXwww.baidu.com CNAMEwww.test.com NS-s 后接测试使用的DNS服务器IP-l 测试时间，单位为秒-T 每秒发送的请求数（qps）命令执行完成后会输出结果，如下：Statistics: Parse input file: multiple times Run time limit: 60 seconds Ran through file: 5999 times Queries sent: 6000 queries #查询总请求数 Queries completed: 6000 queries #查询成功的请求数 Queries lost: 0 queries #查询失败的请求数 Queries delayed(?): 0 queries RTT max: 0.000520 sec RTT min: 0.000109 sec RTT average: 0.000291 sec RTT std deviation: 0.000062 sec RTT out of range: 0 queries Percentage completed: 100.00% Percentage lost: 0.00% Started at: Fri Aug 15 10:42:00 2014 Finished at: Fri Aug 15 10:43:00 2014 Ran for: 60.000338 seconds Queries per second: 99.999437 qps #每秒查询的次数（qps） Total QPS/target: 99.999437/100 qps

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