配置dns服务。

1、 在两台master，slave服务器上，分别安装

yum install -y bind bind-chroot bind-libs bind-utils

2、 修改master的allow-transfer和zone部分。修改

slave的zone部分分别拷贝到/etc/named.conf。

Master.conf配置文件

//
// named.conf
//
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS// server as a caching only nameserver (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//
options {
    	
listen-on port 53 {
     any; };	
listen-on-v6 port 53 {
     any; };	
directory 	"/var/named";	
dump-file 	"/var/named/data/cache_dump.db";	statistics-file "/var/named/data/named_stats.txt";	memstatistics-file "/var/named/data/named_mem_stats.txt";	allow-query     {
     any; };	allow-transfer {
     192.168.152.xx(主ip); };	
/* 	 
- If you are building an AUTHORITATIVE DNS server, do NOT enable recursion.	 
- - If you are building a RECURSIVE (caching) DNS server, you need to enable 	   recursion. 	 
- - If your recursive DNS server has a public IP address, you MUST enable access 	   control to limit queries to your legitimate users. Failing to do so will	   cause your server to become part of large scale DNS amplification 	   attacks. Implementing BCP38 within your network would greatly	   reduce such attack surface 	
*/	
recursion no;	
dnssec-enable yes;	
dnssec-validation yes;	
/* Path to ISC DLV key */	
bindkeys-file "/etc/named.iscdlv.key";	

managed-keys-directory "/var/named/dynamic";	pid-file "/run/named/named.pid";	
session-keyfile "/run/named/session.key";};

zone "域名" IN {
    	
type master;	
file "/var/named/named.(你所写的文件名称)";	
allow-transfer {
     192.168.xx.xx(ip地址); };
};
zone "XX.168.192(网址前三段倒着写).in-addr.arpa" IN {
    	
type master;	
file "/var/named/named.ip段";	
allow-transfer {
     192.168.162.129; };
};
logging {
            
  channel default_debug {
                                   file "data/named.run";                severity dynamic;        };};zone "." IN {
    	type hint;	file "named.ca";};include "/etc/named.rfc1912.zones";include "/etc/named.root.key";

Slave.conf的配置文件

//
// named.conf
//
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS
// server as a caching only nameserver (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//
options {
    	
listen-on port 53 {
     any; };	
listen-on-v6 port 53 {
     any; };	
directory 	"/var/named";	
dump-file 	"/var/named/data/cache_dump.db";	

statistics-file "/var/named/data/named_stats.txt";	memstatistics-file "/var/named/data/named_mem_stats.txt";	allow-query     {
     any; };	
/* 	 
- If you are building an AUTHORITATIVE DNS server, do NOT enable recursion.	 
- - If you are building a RECURSIVE (caching) DNS server, you need to enable 	   recursion. 	 
- - If your recursive DNS server has a public IP address, you MUST enable access 	   control to limit queries to your legitimate users. Failing to do so will	   cause your server to become part of large scale DNS amplification 	   attacks. Implementing BCP38 within your network would greatly	   reduce such attack surface 	
- */	
- recursion no;	
- dnssec-enable yes;	
- dnssec-validation yes;	
- /* Path to ISC DLV key 
- */	
bindkeys-file "/etc/named.iscdlv.key";	managed-keys-directory "/var/named/dynamic";	pid-file "/run/named/named.pid";	
session-keyfile "/run/named/session.key";
};
zone "域名" IN {
    	
type slave;	
file "/var/named/named.域名";	
masters {
     192.168.152.xx; };
};
zone "152.168.192.in-addr.arpa" IN {
    	
type slave;	
file "/var/named/named.192.168.152";	masters {
     192.168.152.xx; };
};
logging {
            
channel default_debug {
                    
file "data/named.run";                severity dynamic;        };
};
zone "." IN {
    	
type hint;	
file "named.ca";
};
include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";

3、 到 /var/named 配置正解文件named.域名 和反解文件ip，注意正解文件把yum 和time主, time从写进去。

Ip解析

$TTL 600
@       IN SOA  master.域名      root.mail.域名 ( 2016110303 3H 15M 1W 1D )
@       IN NS   master.域名
@       IN NS   slave.域名
129       IN PTR  master.域名
131       IN PTR  slave.域名
#其中129为ip最后几位

域名解析

$ORIGIN 域名
$TTL 600@                       IN SOA  master.域名      root.mail.域名 ( 2016110303 3H 15M 1W 1D )
@                       IN NS   master.域名
@                       IN NS   slave.域名
master.域名      IN A    192.168.152.129
slave.域名       IN A    192.168.152.131
aaa	IN CNAME        master.域名
bbb	IN CNAME        slave.域名

4、 配置完后检查配置文件看是否有语法错误：

a) named.conf: named-checkconf /etc/named.conf
b) zone文件：
i. named-checkzone 域名 /var/named/named.域名
ii. named-checkzone IP /var/named/named.IP
检查完更正语法错误。
注意文件的属主属组named

5、 启动named服务。主备服务器都启动：

systemctl enable named
systemctl start named

6、 检查dns是否正常：

cat << EOF > /etc/resolv.conf
search 域名
nameserver $dns1
nameserver $dns2
EOF
主从一致

配置hosts文件
添加
Ip 主机名.域名
Ip 主机名.域名
然后nslookup 主机名看看是否能正常解析。nslookup ip 看是否能反解。
dns master 的服务器正常后， 把/etc/resolv.conf的nameserver 改成$dns2的地址。看 dns slave是否解析正常。
调试到都正常为止。