Bind dlz 测试手记

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一.Bind-DLZ介绍
Bind-DLZ主页：http://bind-dlz.sourceforge.net/
Bind-DLZ发布软件的频率跟不上Bind9，新版本的Bind9不被官方的Bind-DLZ支持，因此有人做了跟进。
DLZ(Dynamically Loadable Zones)与传统的BIND9不同，BIND的不足之处：

BIND从文本文件中获取数据，这样容易因为编辑错误出现问题。
BIND需要将数据加载到内存中，如果域或者记录较多，会消耗大量的内存。
BIND启动时解析Zone文件，对于一个记录较多的DNS来说，会耽误更多的时间。
如果近修改一条记录，那么要重新加载或者重启BIND才能生效，那么需要时间，可能会影响客户端查询。

二.安装配置Bind-DLZ
#mkidr /usr/local/src/bind
#cd /usr/local/src/bind
#wget http://ftp.isc.org/isc/bind9/9.6.0-P1/bind-9.6.0-P1.tar.gz
#tar zxvf bind-9.6.0-P1.tar.gz
#cd bind-9.6.0-P1
1.编译安装

./configure --with-dlz-mysql --enable-largefile --enable-threads=no --prefix=/usr/local/bind
make && make install

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注:采用mysql做后台数据库，千万不能用?enable-threads选项启用多线程，网上有一些朋友使用mysql做后台，谈到bind会莫名中断服务，大部分都是因为打开了多线程。
2.创建相关配置文件

cd /usr/local/bind/etc/
../sbin/rndc-confgen >rndc.conf
tail -n10 rndc.conf | head -n9 | sed -e s/#\//g >named.conf

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vi localhost.zone
ttl 86400

@ IN SOA localhost. root.localhost. (
1997022700 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS localhost.
1 IN PTR localhost.

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dig > named.root

3.在named.conf中添加DLZ相关的设置
#vi named.conf //在后面添加如下
dlz "Mysql zone" {
database "mysql
{host=127.0.0.1 dbname=dns ssl=false port=3306 user=root pass= }    //数据库相关连接账号,注意填写正确.
{select zone from dns_records where zone = '%zone%' limit 1}
{select ttl, type, mx_priority, case when lower(type)='txt' then concat('\"', data, '\"')
      else data end from dns_records where zone = '%zone%' and host = '%record%'
      and not (type = 'SOA' or type = 'NS')}
{select ttl, type, mx_priority, data, resp_person, serial, refresh, retry, expire, minimum
      from dns_records where zone = '%zone%' and (type = 'SOA' or type='NS')}
{select ttl, type, host, mx_priority, data, resp_person, serial, refresh, retry, expire,
      minimum from dns_records where zone = '%zone%' and not (type = 'SOA' or type = 'NS')}
{select zone from xfr_table where zone = '%zone%' and client = '%client%'}
{update data_count set count = count + 1 where zone ='%zone%'}";
};

4. 创建DNS数据库

CREATE DATABASE dns;

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建一个表dns_records

use dns;
DROP TABLE IF EXISTS `dns_records`;
CREATE TABLE `dns_records` (
`id` int(10) unsigned NOT NULL auto_increment,
`zone` varchar(255) NOT NULL,
`host` varchar(255) NOT NULL default '@',
`type` enum('MX','CNAME','NS','SOA','A') NOT NULL,
`data` varchar(255) default NULL,
`ttl` int(11) NOT NULL default '800',
`mx_priority` varchar(255) default NULL,
`refresh` int(11) default NULL,
`retry` int(11) default NULL,
`expire` int(11) default NULL,
`minimum` int(11) default NULL,
`serial` bigint(20) default NULL,
`resp_person` varchar(255) default NULL,
`primary_ns` varchar(255) default NULL,
PRIMARY KEY (`id`),
KEY `id` (`id`),
KEY `type` (`type`),
KEY `host` (`host`),
KEY `zone` (`zone`)
) ENGINE=MyISAM AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

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5.在在终端启动调试bind服务
[root@lemp ~]# /usr/local/bind/sbin/named -uroot -g -d 1
/usr/local/bind/sbin/named: error while loading shared libraries: libmysqlclient.so.16 //出错

#ln -s /usr/local/mysql/lib/mysql/libmysqlclient.so.16 /usr/lib/ //建立链链接即可.
#ldconfig

# /usr/local/bind/sbin/named -uroot -g -d 1 //无报错信息,继续如下.

三.添加相关记录并进行测试.
1.#zone anlegen:

--soa

INSERT INTO dns_records (zone,host,type,serial,refresh,retry,expire,minimum,primary_ns,resp_person)
VALUES ('linuxtone.org', '@', 'SOA', 2009030200, 172800, 800, 1209600, 3600 , 'ns1.linuxtone.org', 'root.linuxtone.org.');

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--linuxtone.org redirection for any host to linuxtone.org.

INSERT INTO dns_records (zone,host,type,DATA)
VALUES ('linuxtone.org', '*', 'CNAME', 'linuxtone.org.');

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--nameserver for zone

INSERT INTO dns_records (zone,host,type,DATA)
VALUES ('linuxtone.org', '@', 'NS', 'ns1.linuxtone.org.');

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--toplevel-ip-address of zone itself

INSERT INTO dns_records (zone,host,type,DATA)
VALUES ('linuxtone.org', '@', 'A', '192.168.0.103');

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2.#host anlegen:
--ip nameserver (resp_person can be NULL)

INSERT INTO dns_records (zone,host,type,DATA,resp_person)
VALUES ('linuxtone.org', 'ns1', 'A', '192.168.0.103', 'root.linuxtone.org.');

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A:www.linuxtone.org

INSERT INTO dns_records (zone,host,type,DATA)
VALUES ('linuxtone.org', 'www', 'A', '192.168.0.108');

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A:bbs.linuxtone.org

INSERT INTO dns_records (zone,host,type,DATA)
VALUES ('linuxtone.org', 'bbs', 'A', '192.168.0.109');

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3.#host alias anlegen:
--ns2 directs to ns1

INSERT INTO dns_records (zone,host,type,DATA,resp_person)
VALUES ('linuxtone.org', 'ns2', 'CNAME', 'ns1.linuxtone.org.', 'root.linuxtone.org.');

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alias:man.linuxtone.org cname www

INSERT INTO dns_records (zone,host,type,DATA)
VALUES ('linuxtone.org', 'man', 'CNAME', 'www');

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alias: host.linuxton.org cname bbs

INSERT INTO dns_records (zone,host,type,DATA)
VALUES ('linuxtone.org', 'host', 'CNAME', 'bbs.linuxtone.org.');

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4.#mailserver anlegen:
--ns2 directs to ns1

INSERT INTO dns_records (zone,host,type,DATA,mx_priority, resp_person)
VALUES ('linuxtone.org', '*', 'MX', 'mail.linuxtone.org.', '80', 'root.linuxtone.org.');

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四.相关表结构及bind查询测试.
1.表结构:

2.查询测试(增加记录实时生效,再也不要像以前一样重启相关配置文件了.)

附:
我的表结构和相关数据:{请下载}
named.conf配置文件:

四.启动脚本(增加named进程数,提高性能!)
1.创建多个named.conf配置文件

for i in `seq 1 8`
do
cp named.conf named1$i.conf
done

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2.启动脚本
[root@lemp etc]# vi /etc/init.d/named
#!/bin/bash
# named a network name service.
# chkconfig: 345 35 75
# description: a name server
# http://www.linuxtone.org

if [ `id -u` -ne 0 ]
then
echo "ERROR:For bind to port 53,must run as root."
exit 1
fi
case "$1" in
start)
if [ -x /usr/local/bind/sbin/named ]; then
for i in `seq 1 8`
do
/usr/local/bind/sbin/named -c /usr/local/bind/etc/named1$i.conf -u root
echo "BIND9-named1$i server started"
done
fi
;;
stop)
kill `cat /usr/local/bind/var/named.pid` && echo . && echo 'BIND9 server stopped'
;;
restart)
echo .
echo "Restart BIND9 server"
$0 stop
sleep 10
$0 start
;;
reload)
/usr/local/bind/sbin/rndc reload
;;
status)
/usr/local/bind/sbin/rndc status
;;
*)
echo "$0 start | stop | restart |reload |status"
;;

esac

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