Linux下DNS服务器配置

简要描述各种DNS服务器的配置方法。包括正向解析DNS服务器、逆向解析DNS服务器、主从DNS服务器。

实验环境整体配置

关闭SElinux

setenfore 0

清空防火墙

iptables -F

修改主配置文件 /etc/named.conf

#监听本机外网端口
listen-on port 53 { 127.0.0.1;192.168.45.202; };
#不监听ipv6
//listen-on-v6 port 53 { ::1; };
#允许查询
allow-query     { any; };
#关闭dnssec
dnssec-enable no;
dnssec-validation no;

配置正向解析DNS服务器配置

修改zone配置 /etc/named.rfc1912.zones

#增加zone文件
zone "easylinux.com" IN {
    type master;
    file "easylinux.com.zone";
    allow-update { none;  };
};

添加easylinux.com.zone文件至 /var/named

$TTL 86400
$ORIGIN easylinux.com.

@       IN      SOA     easylinux.com.  nsadmin.easylinux.com. (
        20170528
        2H
        1M
        1W
        1D
)
        IN      NS      ns1.easylinux.com.
        IN      NS      ns2.easylinux.com.
        IN      MX      10      mx.easylinux.com.
ns1     IN      A       192.168.45.100
ns2     IN      A       192.168.45.101
mx      IN      A       192.168.45.102
www     IN      A       192.168.45.201
web     IN      CNAME   www

验证解析

~]# dig easylinux.com. @192.168.45.202

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6 <<>> easylinux.com. @192.168.45.202
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48423
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;easylinux.com.            IN    A

;; AUTHORITY SECTION:
easylinux.com.        86400    IN    SOA    easylinux.com. nsadmin.easylinux.com. 20170528 7200 60 604800 86400

;; Query time: 0 msec
;; SERVER: 192.168.45.202#53(192.168.45.202)
;; WHEN: Mon May 22 11:49:28 2017
;; MSG SIZE  rcvd: 75

[root@CentOS68every named]# host easylinux.com. @192.168.45.202
host: couldn't get address for '@192.168.45.202': failure
[root@CentOS68every named]# host easylinux.com. 192.168.45.202
Using domain server:
Name: 192.168.45.202
Address: 192.168.45.202#53
Aliases: 

easylinux.com mail is handled by 10 mx.easylinux.com.

配置逆向解析DNS

修改zone配置 /etc/named.rfc1912.zones

zone "45.168.192.in-addr.arpa" IN {
        type master;
        file "192.168.45.zone";
        allow-update { none;  };
};

添加192.168.45.zone文件至 /var/named
$TTL 86400
$ORIGIN 45.168.192.in-addr.arpa.

@       IN      SOA     ns1.easylinux.com.      nsadmin.easylinux.com. (
                20170528
                2H
                1M
                1W
                1D
)
                IN      NS      ns1.easylinux.com.
                IN      NS      ns2.easylinux.com.
192.168.45.100  IN      PTR     ns1.easylinux.com.
192.168.45.101  IN      PTR     ns2.easylinux.com.
192.168.45.102  IN      PTR     mx.easylinux.com.
192.168.45.201  IN      PTR     www.easylinux.com.

验证解析

~]# dig -x 192.168.45.201 @192.168.45.202

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6 <<>> -x 192.168.45.201 @192.168.45.202
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22989
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;201.45.168.192.in-addr.arpa.    IN    PTR

;; AUTHORITY SECTION:
45.168.192.in-addr.arpa. 86400    IN    SOA    ns1.easylinux.com. nsadmin.easylinux.com. 20170528 7200 60 604800 86400

;; Query time: 1 msec
;; SERVER: 192.168.45.202#53(192.168.45.202)
;; WHEN: Mon May 22 12:06:51 2017
;; MSG SIZE  rcvd: 106

配置主从服务器

配置解析easylinux.com.的从服务器

增加一个从zone配置 /etc/named.rfc1912.zones

zone "easylinux.com" IN {
    type slave;
    file "slaves/easylinux.com.zone";
    masters { 192.168.45.202; };
};

查看是否自动生成zone文件

~]# ls /var/named/slaves/
easylinux.com.zone

验证配置

~]# dig www.easylinux.com @192.168.45.203

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6 <<>> www.easylinux.com @192.168.45.203
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28361
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

;; QUESTION SECTION:
;www.easylinux.com.        IN    A

;; ANSWER SECTION:
www.easylinux.com.    86400    IN    A    192.168.45.201

;; AUTHORITY SECTION:
easylinux.com.        86400    IN    NS    ns2.easylinux.com.
easylinux.com.        86400    IN    NS    ns1.easylinux.com.

;; ADDITIONAL SECTION:
ns1.easylinux.com.    86400    IN    A    192.168.45.100
ns2.easylinux.com.    86400    IN    A    192.168.45.101

;; Query time: 1 msec
;; SERVER: 192.168.45.203#53(192.168.45.203)
;; WHEN: Fri May 26 18:01:36 2017
;; MSG SIZE  rcvd: 119