linux基本服务系列之智能DNS（三）

前言

上一期讲了利用bind+mysql的结合，打造一个数据库管理的一个DNS系统，从而能减少运维的维护量；这期再讲讲增加dns远程管理的功能和外部解析能力，可以进一步舒服的维护DNS系统。

rndc远程控制服务

1、在被管理的服务器上生成密钥
# cd /var/named/chroot/etc
# rndc-confgen -a -b 128 -k mrndc-key -c mrndc.key -s 172.16.0.254 \\主服务器上运行
# cat mrndc.key
key "mrndc-key" {

algorithm hmac-md5;
secret "zL1WPhVyoDaiDVh5/2XDuQ==";
};

controls {
inet 172.16.10.222 port 953 allow { 172.16.0.254; } keys { "mrndc-key"; };
};

# chown named:named /var/named/chroot/etc/mrndc.key
# vim /etc/named.conf
include "/etc/mrndc.key";

# rndc-confgen -a -b 128 -k srndc-key -c srndc.key -s 172.16.0.254\\从服务器上运行

2、在控制服务器上进行配置
# vim /etc/rndc.conf
key "mrndc-key" { 
algorithm hmac-md5;
secret "zL1WPhVyoDaiDVh5/2XDuQ==";
};

key "srndc-key" {
algorithm hmac-md5;
secret "MJqtxmTI9LQbmdn9R7DHtg==";
};

options {
default-key "mrndc-key";
default-server 172.16.10.222;
default-port 953;
};

server 172.16.10.222 {
key "mrndc-key";
};

server 172.16.10.223 {
key "srndc-key";
}; 

这样子，你就可以轻松在控制服务器上对被管理的DNS服务器进行关闭重启等操作！

增加外部解析能力

产品的需求总是无穷无尽的，很多人想在这个智能dns系统上面，加上外部解析的能力，其实很简单，在option里加几条简单的语句：

options {

directory "/var/cache/bind9";

//If there is a firewall between you and nameservers you want

//to talk to, you may need to fix the firewall to allow multiple

//ports to talk.  See http://www.kb.cert.org/vuls/id/800113

//If your ISP provided one or more IP addresses for stable

//nameservers, you probably want to use them as forwarders.  

//Uncomment the following block, and insert the addresses replacing

//the all-0's placeholder.

//forwarders {

//     0.0.0.0;

//};

version "UnKnow";

listen-on { 127.0.0.1; 121.201.11.16; 121.201.11.17; };

auth-nxdomain no;    # conform to RFC1035

listen-on-v6 { none; };

//allow-recursion { any; };

allow-query { any; };

//allow-query-cache { any; };

recursion yes;

forwarders { 114.114.114.114; };

forward first;

max-cache-ttl 604800;

};

处理完这两个，你就能很好对dns系统进行控制了

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