Bind+Berkerley DB实现Transactional mode 动态更新(2)

三．Dns数据在Berkeley中的关系以及存储方式

1．数据结构

定义：typedef struct bdb_instance {

       DB_ENV  *dbenv;       

       DB   *data;          

       DBC *cursor;

       DBC *cursor2;

       DBC *cursor3;

       DBC *cursor4;

       DB   *zone;         

       DB   *xfr;             

       DB   *client;  

} bdbhpt_instance_t;

1．  表及算法

包括：dns_data

         dns_zone

      dns_host

      dns_client

 

Dns_data	Hash	key	Zone+a space+host
		value	Dns data
Dns_xfr	Hash	key	zone
		value	host
Dns_zone	Btree	key	Reverse zone
		value	NULL
Dns_client	Hash	key	Zone
		value	Xfr ip

3. dns data字段：

Order	Name	Data Type	Description
1	replication_id	string	a unique alpha-numeric id for this record.
2	host	string	DNS host name
3	ttl	string (num)	Time to live (string must convert to number)
4	type	string	DNS data type
5	mx_priority	string (num)	MX Priority (only for MX DNS types)
6	data	string	IP address / Host name / Full domain name
7	primary_ns	string	Primary name server SOA record (SOA ONLY)
8	resp_person	string	Responsible person SOA record (SOA ONLY)
9	serial	string (num)	Serial # for SOA record (SOA ONLY)
10	refresh	string (num)	Refresh timefor SOA record (SOA ONLY)
11	retry	string (num)	Retry time for SOA record (SOA ONLY)
12	expire	string (num)	Expire time for SOA record (SOA ONLY)
13	minimum	string (num)	Minimum time for SOA record (SOA ONLY)

4.各表之间的逻辑关系

       Dns_client是控制客户端多台同步

Dns_xfr是Dns_client允许增量传输的zone和host

Dns_zone是reverse zone能提高查询速度，其值为空，当查询zone的时候其关系为：

       Dns_zone--àdns_xfràdns_data

Dns_data 是最终数据集，当查host时的关系为：

       Dns_xfràdns_data

5.实例数据

注：bind+bdbhpt官方文档有几个错误，数据要严格按照下面的来定义

[dns_zone] key: moc.tset , data:

[dns_client] key: test.com , data: 127.0.0.1

[dns_client] key: test.com , data: 192.168.1.10

[dns_xfr] key: test.com , data: @

[dns_data] key: test.com @ , data: 1 @ 86400 SOA ns1.test.com. hostmaster.test.com. 2006112401 28800 7200 604800 86400

[dns_xfr] key: test.com , data: download

[dns_data] key: test.com download , data: 18 download 600 A 192.168.1.15

[dns_data] key: test.com download , data: 19 download 600 A 192.168.1.16

[dns_xfr] key: test.com , data: video

[dns_data] key: test.com video , data: 20 video 600 A 192.168.1.17

[dns_data] key: test.com video , data: 21 video 600 A 192.168.1.18

[dns_xfr] key: test.com , data: www

[dns_data] key: test.com www , data: 10 www 600 A 192.168.1.19

[dns_data] key: test.com www , data: 11 www 600 A 192.168.1.10

[dns_data] key: test.com www , data: 12 www 600 A 192.168.1.20