DNS（bind）添加A、CNAME、MX、PTR记录、智能DNS（ACL）
1、添加一条A记录（记得更改serial）：
vim /var/named/chroot/etc/lnh.com.zone
重启一下：
rndc reload
查看从服务器：
测试结果：
master结果：
第一种方法：是用resolv.conf中定义的DNS服务器查出百度主机的IP。
第二种方法（上述方法）：是用本地的DNS（127.0.0.1）来查cc.lnh.com主机的IP。
slave结果（在master上看的）：
2、CNAME记录（如上）
cname CNAME a.lnh.com.
3、MX记录（如上）
mx MX 5 192.168.123.123 mx MX 10 191.1.1.1
4、PTR记录（反向解析）
MASTER：
[root@localhost etc]# cat view.conf
view "View" {
zone "lnh.com" {
type master;
file "lnh.com.zone";
allow-transfer {
192.168.222.146;
};
notify yes;
also-notify {
192.168.222.146;
};
};
zone "168.192.in-addr.arpa" {
type master;
file "168.192.zone";
allow-transfer {
192.168.222.146;
};
notify yes;
also-notify {
192.168.222.146;
};
};
};
”168.192.in-addr.arpa“固定格式，ip反过来了。
[root@localhost etc]# cat 168.192.zone
$TTL 3600 ; 1 hour
@ IN SOA op.lnh.com. dns.lnh.com. (
2030 ; serial
900 ; refresh (15 minutes)
600 ; retry (10 minutes)
86400 ; expire (1 day)
3600 ; minimum (1 hour)
)
NS op.lnh.com.
102.122 IN PTR a.lnh.com.
1.1 IN PTR B.lnh.com.
此时要看看权限：chown named.named 168.192.zone
Slave配置：
[root@localhost etc]# cat view.conf
view "SlaveView" {
zone "lnh.com" {
type slave;
masters {192.168.222.145; };
file "slave.lnh.com.zone";
};
zone "168.192.in-addr.arpa" {
type slave;
masters {192.168.222.145; };
file "slave.168.192.zone";
};
};
这个是同步过来的：
[root@localhost etc]# cat slave.168.192.zone $ORIGIN . $TTL 3600 ; 1 hour 168.192.in-addr.arpa IN SOA op.lnh.com. dns.lnh.com. ( 2030 ; serial 900 ; refresh (15 minutes) 600 ; retry (10 minutes) 86400 ; expire (1 day) 3600 ; minimum (1 hour) ) NS op.lnh.com. $ORIGIN 168.192.in-addr.arpa. 1.1 PTR B.lnh.com. 102.122 PTR a.lnh.com.
注意：a.lnh.com. 后面一定要有.
查看：
[root@localhost etc]# host 192.168.122.102 127.0.0.1 Using domain server: Name: 127.0.0.1 Address: 127.0.0.1#53 Aliases: 102.122.168.192.in-addr.arpa domain name pointer a.lnh.com.
5、通过DNS实现负载均衡，，就是多加一条A记录，，这个有个问题，当这个后端服务器挂了，他也会解析，所以不建议用，，轮询的调度算法，没有健康监测。
[root@localhost etc]# host cc.lnh.com 127.0.0.1 Using domain server: Name: 127.0.0.1 Address: 127.0.0.1#53 Aliases: cc.lnh.com has address 123.123.123.124 cc.lnh.com has address 123.123.123.123
6、配置DNS视图（智能DNS），当DNS服务器接到请求时会匹配这两个组的ip，下面的加在include上，，此时就可以根据group来区分不用运营商分到不同的ip。
/var/named/chroot/etc
[root@localhost etc]# vim named.conf
acl group1 {
192.168.222.145;
};
acl group2 {
192.168.222.146;
};
[root@localhost etc]# >view.conf
[root@localhost etc]# vim view.conf
[root@localhost etc]# pwd
/var/named/chroot/etc
[root@localhost etc]# cat view.conf
view "GROUP1" {
match-clients { group1; };
zone "viewlnh.com" {
type master;
file "group1.viewlnh.com.zone";
};
};
view "GROUP2" {
match-clients { group2; };
zone "viewlnh.com" {
type master;
file "group2.viewlnh.com.zone";
};
};
[root@localhost etc]# pwd
/var/named/chroot/etc
[root@localhost etc]# vim group1.viewlnh.com.zone
$ORIGIN .
$TTL 3600 ; 1 hour
viewlnh.com IN SOA op.lnh.com. dns.lnh.com. (
2030 ; serial
900 ; refresh (15 minutes)
600 ; retry (10 minutes)
86400 ; expire (1 day)
3600 ; minimum (1 hour)
)
NS op.lnh.com.
$ORIGIN viewlnh.com.
op A 192.168.122.1
view A 192.168.122.1
[root@localhost etc]# pwd
/var/named/chroot/etc
[root@localhost etc]# vim group2.viewlnh.com.zone
$ORIGIN .
$TTL 3600 ; 1 hour
viewlnh.com IN SOA op.lnh.com. dns.lnh.com. (
2030 ; serial
900 ; refresh (15 minutes)
600 ; retry (10 minutes)
86400 ; expire (1 day)
3600 ; minimum (1 hour)
)
NS op.lnh.com.
$ORIGIN viewlnh.com.
op A 192.168.122.2
view A 192.168.122.2
修改权限
[root@localhost etc]# chown named.named group*
查看，在192.168.222.145上看
[root@localhost etc]# dig @192.168.222.145 view.viewlnh.com ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.5 <<>> @192.168.222.145 view.viewlnh.com ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49593 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;view.viewlnh.com. IN A ;; ANSWER SECTION: view.viewlnh.com. 3600 IN A 192.168.122.1 ;; AUTHORITY SECTION: viewlnh.com. 3600 IN NS op.lnh.com. ;; Query time: 1 msec ;; SERVER: 192.168.222.145#53(192.168.222.145) ;; WHEN: Wed Mar 21 18:33:51 2018 ;; MSG SIZE rcvd: 71
在192.168.222.146上看
[root@localhost etc]# dig @192.168.222.145 view.viewlnh.com ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.5 <<>> @192.168.222.145 view.viewlnh.com ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11962 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;view.viewlnh.com. IN A ;; ANSWER SECTION: view.viewlnh.com. 3600 IN A 192.168.122.2 ;; AUTHORITY SECTION: viewlnh.com. 3600 IN NS op.lnh.com. ;; Query time: 3 msec ;; SERVER: 192.168.222.145#53(192.168.222.145) ;; WHEN: Wed Mar 21 18:36:16 2018 ;; MSG SIZE rcvd: 71
