实现DNS的主从同步：
主DNS的bind版不能高于从DNS的版本
向区域中添加从服务器的关键两步：
a：在上级得到授权
b：在区域数据文件中为服务器添加一条NS记录和对应的A记录或PTR记录
1.为主DNS服务器添加一条NS记录和对应的A记录
# vim /var/named/mageedu.com.zone $TTL 86400 @ IN SOA dsn.mageedu.com. admin.mageedu.com ( 2014031901 1D 12H 1D 12H ) IN NS dns IN NS ns IN MX 20mail dns IN A 172.16.19.100 ns IN A 172.16.19.1 mail IN A 172.16.19.2 www IN A 172.16.19.3 pop IN CNAME mail ftp IN CNAME www
2.为从DNS服务器添加一条NS记录和对应PTR记录
# vim /var/named/172.16.19.zone $TTL 86400 @ IN SOA dsn.mageedu.com. admin.mageedu.com ( 2014031902 1D 12H 1D 12H ) IN NS dns.mageedu.com. IN NS ns.mageedu.com. 100IN PTR dns.mageedu.com. 1IN PTR ns.mageedu.com. 2IN PTR mail.mageedu.com. 3IN PTR www.mageedu.com.
3.并编辑配置文同上
4.在从服务器添加mageedu.com区域
zone "mageedu.com"IN {
type slave;
masters {172.16.19.100;};
file "slaves/mageedu.com.zone";
};5.在从服务器添加19.16.172.in-addr.arpa区域
zone "19.16.172.in-addr.arpa"IN {
type slave;
masters {172.16.29.100;};
file "slaves/172.16.19.zone";
};6.启动named服务
# named -u named
7.查看日志文件
# tail /var/log/messages Mar 1705:44:18stu19 named[31977]: zone 19.16.172.in-addr.arpa/IN: Transfer started. Mar 1705:44:18stu19 named[31977]: transfer of '19.16.172.in-addr.arpa/IN'from 172.16.19.100#53: connected using 172.16.19.1#47647 Mar 1705:44:18stu19 named[31977]: zone 19.16.172.in-addr.arpa/IN: transferred serial 2014031902 Mar 1705:44:18stu19 named[31977]: transfer of '19.16.172.in-addr.arpa/IN'from 172.16.19.100#53: Transfer completed: 1messages, 8records, 255bytes, 0.003secs (85000bytes/sec) Mar 1705:44:18stu19 named[31977]: zone 19.16.172.in-addr.arpa/IN: sending notifies (serial 2014031902) Mar 1705:44:18stu19 named[31977]: zone mageedu.com/IN: Transfer started. Mar 1705:44:18stu19 named[31977]: transfer of 'mageedu.com/IN'from 172.16.19.100#53: connected using 172.16.19.1#40334 Mar 1705:44:18stu19 named[31977]: zone mageedu.com/IN: transferred serial 2014031901 Mar 1705:44:18stu19 named[31977]: transfer of 'mageedu.com/IN'from 172.16.19.100#53: Transfer completed: 1messages, 11records, 283bytes, 0.002secs (141500bytes/sec) Mar 1705:44:18stu19 named[31977]: zone mageedu.com/IN: sending notifies (serial 2014031901)
8.查从服务器中/var/named/slave/目录
# ls /var/named/slaves/ 172.16.19.zone mageedu.com.zone
区域传送安全控制
提高DNS服务器的安全性
在主服务器的区域文件中添加allow-transfer{IP};
只允许127.0.0.1和172.16.19.1进行区域传送
zone "mageedu.com"IN {
type master;
file "mageedu.com.zone";
allow-transfer {127.0.0.1;172.16.19.1;};
};
zone "19.16.172.in-addr.arpa"IN {
type master;
file "172.16.19.zone";
allow-transfer {127.0.0.1;172.16.19.1;};
};重启主服务器的DNS服务
# service named reload
成功配置区域传送安全控制
# dig -t axfr mageedu.com @172.16.19.100 ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6 <<>> -t axfr mageedu.com @172.16.19.100 ;; global options: +cmd ; Transfer failed. # dig -t axfr mageedu.com @172.16.19.1 ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6 <<>> -t axfr mageedu.com @172.16.19.1 ;; global options: +cmd mageedu.com. 86400IN SOA dsn.mageedu.com. admin.mageedu.com.mageedu.com. 201403190186400432008640043200 mageedu.com. 86400IN MX 20mail.mageedu.com. mageedu.com. 86400IN NS dns.mageedu.com. mageedu.com. 86400IN NS ns.mageedu.com. dns.mageedu.com. 86400IN A 172.16.19.100 ftp.mageedu.com. 86400IN CNAME www.mageedu.com. mail.mageedu.com. 86400IN A 172.16.19.2 ns.mageedu.com. 86400IN A 172.16.19.1 pop.mageedu.com. 86400IN CNAME mail.mageedu.com. www.mageedu.com. 86400IN A 172.16.19.3 mageedu.com. 86400IN SOA dsn.mageedu.com. admin.mageedu.com.mageedu.com. 201403190186400432008640043200 ;; Query time: 5msec ;; SERVER: 172.16.19.1#53(172.16.19.1) ;; WHEN: Sun Mar 1616:29:232014 ;; XFR size: 11records (messages 1, bytes 283)
对从服务配置区域安全传送控制：不允许任何人进行同步
zone "mageedu.com"IN {
type slave;
masters {172.16.19.100;};
file "slaves/mageedu.com.zone";
allow-transfer {none;};
};
zone "19.16.172.in-addr.arpa"IN {
type slave;
masters {172.16.19.100;};
file "slaves/172.16.19.zone";
allow-transfer {none;};
};重启从服务器的DNS服务
# service named reload
测试区域传送安全控制配置成功
[root@stu19 ~]# dig -t axfr mageedu.com @127.0.0.1 ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6 <<>> -t axfr mageedu.com @127.0.0.1 ;; global options: +cmd ; Transfer failed.
