CentOS7部署DNS服务

其他 2019-06-17 17:08:09 阅读次数: 0
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DNS配置介绍

主配置文件/etc/named.conf

options {...};                设定DNS服务器全局环境

listen-on port 53 {...;};     DNS服务named监听的端口和ip

directory                     定义数据库文件存放的目录，即zone file的存放目录

dump-file/statistics-file/memstatistics-file 

                              关于named服务的统计信息的文件

allow-query {...;};           允许询问我DNS服务器的主机

allow-transfer {...;};        是否允许slave DNS对领域数据进行转发

allow-update {...;};          动态DNS更新

recursion                     是否支持递归查询，设置为no将不能访问根服务器

forward                       是否支持转发

        only                  表示只进行转发

        first                 表示优先

        默认first

forwarders {ip1;ip2;....;};   指定转发的上层DNS服务器IP

zone "xxx" IN {...};          区域描述声明

        type                  指定zone类型

            hint              表示跟服务器

            master            表示该区域的主DNS服务器

            slave             表示该区域的从DNS服务器

        file                  表示DNS数据库文件放在哪里

view " " {...};                域名视图描述声明

acl "xxx" {...;};              定义访问控制列表，名字为xxx

        内置的acl：localhost/localnet/any/none:本地主机的IP/该局域网的所有IP/任何IP/所有都不

include " ";                   将过多的zone声明写入一个文件当中，以免主配置文件过于繁琐

数据库文件/var/named/*

DNS服务器的数据库记录信息

$TTL       该区域的记录信息能够在客户端的缓存中存活多长时间

SOA        一个区域的记录信息的开始，必须标识

    格式为：区域    IN    SOA    主DNS服务器域名    邮件服务器域名 (                    

                        serial;    序列号，从DNS的序列号如果小于它则会更新数据

                        refresh;   从DNS服务器多长时间检查一次主DNS的数据   

                        retry;     从DNS服务器连接主DNS失败后，多长时间后重新连接 

                        expire;    从DNS始终无法连接主DNS，从DNS的数据库文件何时失效

                        minimum;   如果DNS服务器查询结果失败，此失败信息会在缓存缓存中存活多长时间

            )
            
NS        管理区域的DNS服务器名称，每个域名都有自己的NS记录，必须标识

A         主机名对应的IPv4地址，必须标识

AAAA      ipv6的地址

MX        表示区域的邮件服务器的域名

CNAME     主机别名，用于域名内部的跳转，为服务器配置提供灵活性。变更域名的IP地址的时候，只需要修改别名

    格式为：别名    IN    CNAME    DNS服务器的域名

PTR       PoinTeR的缩写，逆向查询记录，后边记录的数据就是反解到的主机名，反向解析数据库文件必须标识

对于SOA部分，例如：

        1804170045 
        5 
        5 
        2592000 
        3600

表示：2018/4/17第45次刷新，slave每5秒连接master，连接失败则在5秒之后再次连接，直到2592000秒，查询失败的记录在其他DNS服务器中存活3600秒

DNS解析常用命令

查询主机名IP的命令

        host [option] <FQDN> [server]

                -a         列出详细信息

                -l         列出domain所管理的所有主机名的信息

        nsloopup <FQDN> [server]

                支持正解和反解

        dig [option] <FQDN> [@server]

                +trace     从根服务器开始追踪

                - t <type> 指定查询的数据类别

                -x         反解查询

        whois <domain>

                查询注册的domain的信息

                该命令来自jwhois软件


rndc reload     重新读取named.conf

named-checkconf 检查主配置文件named.conf的语法

安装DNS

  • 规划：
1. 指定区域lzxlinux.com，该DNS服务器的域名为master.lzxlinux.com，同时有另外一个域名为www.lzxlinux.com；

2. 该域名服务器有一个别名叫做ftp.lzxlinux.com；

3. 该区域内有一台名为www.lzxlinux.com的邮件服务器；

4. 该DNS服务器的IP为192.168.30.254，并且用同网段另一台机器192.168.30.131来测试；

5. 该DNS服务器支持正向解析和反向解析。

一个服务器可以是一个IP对应多个域名，同样也可以一个域名对应多个IP。

  • 安装：
yum install -y bind*
  • 修改配置：
vim /etc/named.conf

options {
        listen-on port 53 { 192.168.30.254; };
        listen-on-v6 port 53 { ::1; };
        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";
        recursing-file  "/var/named/data/named.recursing";
        secroots-file   "/var/named/data/named.secroots";
        allow-query     { any; };

        recursion yes;

        dnssec-enable no;
        dnssec-validation no;

        /* 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";
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

zone "." IN {
        type hint;
        file "named.ca";
};

zone "lzxlinux.com" IN {
    type master;
    file "named.lzxlinux.com";
};

zone "30.168.192.in-addr.arpa" IN {             #反解zone的格式，必须将IP倒着写
    type master;
    file "named.192.168.30";
};

include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";
  • 修改正向解析数据库文件：

正解数据库文件中必须要有$TTL、SOA、NS、A记录

vim /var/named/named.lzxlinux.com

$TTL 1D
@                                       IN SOA  master.lzxlinux.com. www.lzxlinux.com. (
                                2019053101      ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
@                           IN      NS      master.lzxlinux.com. ;
@                           IN      MX      10 www.lzxlinux.com. ;
master.lzxlinux.com.        IN      A       192.168.30.254 ;
www.lzxlinux.com.           IN      A       192.168.30.254 ;
ftp.lzxlinux.com.           IN      CNAME   www.lzxlinux.com. ;
  • 修改反向解析数据库文件：

反解数据库文件中必须要有$TTL、SOA、NS、PTR记录

vim /var/named/named.192.168.30

$TTL 1D
@                                       IN SOA  master.lzxlinux.com. www.lzxlinux.com. (
                                2019053101      ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
@                           IN      NS      master.lzxlinux.com. ;
254                         IN      PTR     master.lzxlinux.com. ;
254                         IN      PTR     www.lzxlinux.com. ;
  • 启动named服务：
systemctl start named
  • 解析测试：

到 192.168.30.131 上测试

vim /etc/sysconfig/network-scripts/ifcfg-ens33
#DNS1="8.8.8.8"                 #禁掉外网DNS
DNS1="192.168.30.254"

yum install -y bind-utils

dig master.lzxlinux.com

; <<>> DiG 9.9.4-RedHat-9.9.4-73.el7_6 <<>> master.lzxlinux.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55468
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;master.lzxlinux.com.		IN	A

;; ANSWER SECTION:
master.lzxlinux.com.	86400	IN	A	192.168.30.254

;; AUTHORITY SECTION:
lzxlinux.com.		86400	IN	NS	master.lzxlinux.com.

;; Query time: 2 msec
;; SERVER: 192.168.30.254#53(192.168.30.254)
;; WHEN: Sun Jun 02 21:45:20 EDT 2019
;; MSG SIZE  rcvd: 78

正向解析成功。

dig -x 192.168.30.254

; <<>> DiG 9.9.4-RedHat-9.9.4-73.el7_6 <<>> -x 192.168.30.254
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7803
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;254.30.168.192.in-addr.arpa.	IN	PTR

;; ANSWER SECTION:
254.30.168.192.in-addr.arpa. 86400 IN	PTR	www.lzxlinux.com.
254.30.168.192.in-addr.arpa. 86400 IN	PTR	master.lzxlinux.com.

;; AUTHORITY SECTION:
30.168.192.in-addr.arpa. 86400	IN	NS	master.lzxlinux.com.

;; ADDITIONAL SECTION:
master.lzxlinux.com.	86400	IN	A	192.168.30.254

;; Query time: 1 msec
;; SERVER: 192.168.30.254#53(192.168.30.254)
;; WHEN: Sun Jun 02 21:50:03 EDT 2019
;; MSG SIZE  rcvd: 137

反向解析成功。

dig www.baidu.com

; <<>> DiG 9.9.4-RedHat-9.9.4-73.el7_6 <<>> www.baidu.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29209
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.baidu.com.			IN	A

;; ANSWER SECTION:
www.baidu.com.		1083	IN	CNAME	www.a.shifen.com.
www.a.shifen.com.	212	IN	A	115.239.211.112
www.a.shifen.com.	212	IN	A	115.239.210.27

;; Query time: 7 msec
;; SERVER: 192.168.30.254#53(192.168.30.254)
;; WHEN: Sun Jun 02 21:50:47 EDT 2019
;; MSG SIZE  rcvd: 101

外网解析成功。

配置主从DNS

每个域名中至少需要两台DNS服务器来管理该域名，提供不间断的查询服务，一个master，一个slave，slave自己没有数据库，需要从master那里同步，并且master需要开启数据库传输。

  • 规划：
192.168.30.254作主DNS服务器，域名为master.lzxlinux.com，192.168.30.253作从DNS服务器，域名为slave.lzxlinux.com，他们共同管理区域lzxlinux.com
  • 修改主DNS配置：
vim /etc/named.conf

options {
        listen-on port 53 { 192.168.30.254; };
        listen-on-v6 port 53 { ::1; };
        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";
        recursing-file  "/var/named/data/named.recursing";
        secroots-file   "/var/named/data/named.secroots";
        allow-query     { any; };
        allow-transfer { none; };
        
        recursion yes;

        dnssec-enable no;
        dnssec-validation no;

        /* 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";
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

zone "." IN {
        type hint;
        file "named.ca";
};

zone "lzxlinux.com" IN {
    type master;
    file "named.lzxlinux.com";
    allow-transfer { 192.168.30.253; };
};

zone "30.168.192.in-addr.arpa" IN {
    type master;
    file "named.192.168.30";
    allow-transfer { 192.168.30.253; };
};

include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";
  • 修改主DNS正向解析数据库文件：
vim /var/named/named.lzxlinux.com

$TTL 1D
@                                       IN SOA  master.lzxlinux.com. www.lzxlinux.com. (
                                2019053101      ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
@                           IN      NS      master.lzxlinux.com. ;
@                           IN      NS      slave.lzxlinux.com. ;
@                           IN      MX      10 www.lzxlinux.com. ;
master.lzxlinux.com.        IN      A       192.168.30.254 ;
slave.lzxlinux.com.         IN      A       192.168.30.253 ;
www.lzxlinux.com.           IN      A       192.168.30.254 ;
ftp.lzxlinux.com.           IN      CNAME   www.lzxlinux.com. ;
  • 修改主DNS反向解析数据库文件：
vim /var/named/named.192.168.30

$TTL 1D
@                                       IN SOA  master.lzxlinux.com. www.lzxlinux.com. (
                                2019053101      ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
@                           IN      NS      master.lzxlinux.com. ;
@                           IN      NS      slave.lzxlinux.com. ;
254                         IN      PTR     master.lzxlinux.com. ;
254                         IN      PTR     www.lzxlinux.com. ;
253                         IN      PTR     slave.lzxlinux.com. ;
  • 修改从DNS配置：
vim /etc/named.conf

options {
        listen-on port 53 { localhost; };
        listen-on-v6 port 53 { ::1; };
        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";
        recursing-file  "/var/named/data/named.recursing";
        secroots-file   "/var/named/data/named.secroots";
        allow-query     { any; };
        allow-transfer { none; };
        
        recursion yes;

        dnssec-enable no;
        dnssec-validation no;

        /* 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";
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

zone "." IN {
        type hint;
        file "named.ca";
};

zone "lzxlinux.com" IN {
    type slave;
    file "slaves/named.lzxlinux.com";
    masters { 192.168.30.254; };
};

zone "30.168.192.in-addr.arpa" IN {
    type slave;
    file "slaves/named.192.168.30";
    masters { 192.168.30.254; };
};

include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";
  • 重启主从DNS上named服务：
systemctl restart named

从DNS上/var/named/slaves/目录中自动多出两个文件，这是从DNS同步主DNS的解析数据库

ll /var/named/slaves/

total 8
-rw-r--r-- 1 named named 383 Jun  3 10:51 named.192.168.30
-rw-r--r-- 1 named named 449 Jun  3 10:51 named.lzxlinux.com
  • 查看/var/log/messages日志，有同步传输过程：
vim /var/log/messages

Jun  3 10:51:02 test6 named[6660]: zone 30.168.192.in-addr.arpa/IN: Transfer started.
Jun  3 10:51:02 test6 named[6660]: transfer of '30.168.192.in-addr.arpa/IN' from 192.168.30.254#53: connected using 192.168.30.253#44120
Jun  3 10:51:02 test6 named[6660]: zone 30.168.192.in-addr.arpa/IN: transferred serial 2019053101
Jun  3 10:51:02 test6 named[6660]: transfer of '30.168.192.in-addr.arpa/IN' from 192.168.30.254#53: Transfer completed: 1 messages, 7 records, 220 bytes, 0.005 secs (44000 bytes/sec)
Jun  3 10:51:02 test6 named[6660]: zone 30.168.192.in-addr.arpa/IN: sending notifies (serial 2019053101)
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 192.203.230.10#53
Jun  3 10:51:02 test6 named[6660]: network unreachable resolving './NS/IN': 2001:dc3::35#53
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 192.33.4.12#53
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 192.58.128.30#53
Jun  3 10:51:02 test6 named[6660]: network unreachable resolving './NS/IN': 2001:500:84::b#53
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 192.36.148.17#53
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 193.0.14.129#53
Jun  3 10:51:02 test6 named[6660]: network unreachable resolving './NS/IN': 2001:500:12::d0d#53
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 198.41.0.4#53
Jun  3 10:51:02 test6 named[6660]: network unreachable resolving './NS/IN': 2001:500:1::53#53
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 199.7.91.13#53
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 192.5.5.241#53
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 199.7.83.42#53
Jun  3 10:51:02 test6 named[6660]: network unreachable resolving './NS/IN': 2001:500:a8::e#53
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 202.12.27.33#53
Jun  3 10:51:02 test6 named[6660]: network unreachable resolving './NS/IN': 2001:500:2::c#53
Jun  3 10:51:02 test6 named[6660]: network unreachable resolving './NS/IN': 2001:503:c27::2:30#53
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 192.228.79.201#53
Jun  3 10:51:02 test6 named[6660]: network unreachable resolving './NS/IN': 2001:7fe::53#53
Jun  3 10:51:02 test6 named[6660]: network unreachable resolving './NS/IN': 2001:7fd::1#53
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 192.112.36.4#53
Jun  3 10:51:02 test6 named[6660]: network unreachable resolving './NS/IN': 2001:503:ba3e::2:30#53
Jun  3 10:51:02 test6 named[6660]: FORMERR resolving './NS/IN': 198.97.190.53#53
Jun  3 10:51:02 test6 named[6660]: zone lzxlinux.com/IN: Transfer started.
Jun  3 10:51:02 test6 named[6660]: transfer of 'lzxlinux.com/IN' from 192.168.30.254#53: connected using 192.168.30.253#56074
Jun  3 10:51:02 test6 named[6660]: zone lzxlinux.com/IN: transferred serial 2019053101
Jun  3 10:51:02 test6 named[6660]: transfer of 'lzxlinux.com/IN' from 192.168.30.254#53: Transfer completed: 1 messages, 9 records, 229 bytes, 0.033 secs (6939 bytes/sec)
Jun  3 10:51:02 test6 named[6660]: zone lzxlinux.com/IN: sending notifies (serial 2019053101)

配置子域DNS

  • 规划：
192.168.30.254作主DNS服务器，域名为master.lzxlinux.com，192.168.30.253作从DNS服务器，域名为slave.lzxlinux.com，他们共同管理区域lzxlinux.com。

在lzxlinux.com.下委派子域centos.lzxlinux.com.，192.168.30.128作子域的DNS服务器，域名是dns.centos.lzxlinux.com。
  • 修改上层主DNS正向解析数据库文件：
vim /var/named/named.lzxlinux.com

$TTL 1D
@                                       IN SOA  master.lzxlinux.com. www.lzxlinux.com. (
                                2019053101      ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
@                           IN      NS      master.lzxlinux.com. ;
@                           IN      NS      slave.lzxlinux.com. ;
@                           IN      MX      10 www.lzxlinux.com. ;
centos.lzxlinux.com.        IN      NS      dns.centos.lzxlinux.com. ;
dns.centos.lzxlinux.com.    IN      A       192.168.30.128 ;
master.lzxlinux.com.        IN      A       192.168.30.254 ;
slave.lzxlinux.com.         IN      A       192.168.30.253 ;
www.lzxlinux.com.           IN      A       192.168.30.254 ;
ftp.lzxlinux.com.           IN      CNAME   www.lzxlinux.com. ;
  • 修改下层DNS配置：

注意：要开启子域DNS服务器的转发功能（forward），不开的话只能上层查询下层，下层查询不到上层

yum install -y bind*

vim /etc/named.conf

options {
        listen-on port 53 { 192.168.30.128; };
        listen-on-v6 port 53 { ::1; };
        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";
        recursing-file  "/var/named/data/named.recursing";
        secroots-file   "/var/named/data/named.secroots";
        allow-query     { any; };
        forward first;
        forwarders { 192.168.30.254; };
        
        recursion yes;

        dnssec-enable no;
        dnssec-validation no;

        /* 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";
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

zone "." IN {
        type hint;
        file "named.ca";
};

zone "centos.lzxlinux.com" IN {
    type master;
    file "named.centos.lzxlinux.com";
};

include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";
  • 修改下层DNS正向解析数据库文件：

注意：必须要指明邮件服务器 www.centos.lzxlinux.com.

vim /var/named/named.centos.lzxlinux.com

$TTL 600
@                                       IN SOA  dns.centos.lzxlinux.com. www.centos.lzxlinux.com. (
                                    2019053101  ; serial
                                        3600    ; refresh
                                        3600    ; retry
                                        3600    ; expire
                                        3600 )  ; minimum
@                           IN      NS      dns.centos.lzxlinux.com. ;
@                           IN      MX      10 www.centos.lzxlinux.com. ;
dns                         IN      A       192.168.30.128 ;
www                         IN      A       192.168.30.128 ;
  • 重启上层主DNS和下层DNS上named服务：
systemctl restart named
  • 解析测试：
  1. 上层查询下层子域DNS服务器
dig dns.centos.lzxlinux.com @192.168.30.128

; <<>> DiG 9.9.4-RedHat-9.9.4-73.el7_6 <<>> dns.centos.lzxlinux.com @192.168.30.128
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57592
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;dns.centos.lzxlinux.com.	IN	A

;; ANSWER SECTION:
dns.centos.lzxlinux.com. 600	IN	A	192.168.30.128

;; AUTHORITY SECTION:
centos.lzxlinux.com.	600	IN	NS	dns.centos.lzxlinux.com.

;; Query time: 2 msec
;; SERVER: 192.168.30.128#53(192.168.30.128)
;; WHEN: Mon Jun 03 13:47:24 CST 2019
;; MSG SIZE  rcvd: 82

解析成功。

  1. 下层查询上层DNS服务器：
dig master.lzxlinux.com @192.168.30.254

; <<>> DiG 9.9.4-RedHat-9.9.4-73.el7_6 <<>> master.lzxlinux.com @192.168.30.254
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26944
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;master.lzxlinux.com.		IN	A

;; ANSWER SECTION:
master.lzxlinux.com.	86400	IN	A	192.168.30.254

;; AUTHORITY SECTION:
lzxlinux.com.		86400	IN	NS	slave.lzxlinux.com.
lzxlinux.com.		86400	IN	NS	master.lzxlinux.com.

;; ADDITIONAL SECTION:
slave.lzxlinux.com.	86400	IN	A	192.168.30.253

;; Query time: 0 msec
;; SERVER: 192.168.30.254#53(192.168.30.254)
;; WHEN: Mon Jun 03 13:49:39 CST 2019
;; MSG SIZE  rcvd: 114

解析成功。

整个DNS服务相关的部署没有问题，过程到此结束。

更多资料参考：

一篇文章让你了解DNS

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