前言

上一期講了利用bind+mysql的結合，打造一個數據庫管理的一個DNS系統，從而能減少運維的維護量；這期再講講增加dns遠端管理的功能和外部解析能力，可以進一步舒服的維護DNS系統。

rndc遠端控制服務

1、在被管理的伺服器上生成金鑰
# cd /var/named/chroot/etc
# rndc-confgen -a -b 128 -k mrndc-key -c mrndc.key -s 172.16.0.254 \\主伺服器上執行
# 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\\從伺服器上執行

2、在控制伺服器上進行配置
# 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";
}; 

這樣子，你就可以輕鬆在控制伺服器上對被管理的DNS伺服器進行關閉重啟等操作！

增加外部解析能力

產品的需求總是無窮無盡的，很多人想在這個智慧dns系統上面，加上外部解析的能力，其實很簡單，在option里加幾條簡單的語句：

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;

};

處理完這兩個，你就能很好對dns系統進行控制了

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