Centos7.9主从DNS部署

环境配置

主DNS——linux1:192.168.10.100
从DNS——linux2:192.168.10.101
客户机——Client:192.168.10.200

linux1-2安装DNS服务：yum install bind* -y

主DNS配置

编辑主DNS配置文件：

[root@linux1 ~]# vi /etc/named.conf
options {
        listen-on port 53 { 127.0.0.1; };  //将127.0.0.1改为any
        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     { localhost; };  //将localhost改为any
...
}
[root@linux1 ~]#

编辑主DNS区域文件：

[root@linux1 ~]# vi /etc/named.rfc1912.zones
#在文件末尾添正反向解析文件
...
zone "cetrp.com" IN {
        type master;  #类型为主DNS
        file "cetrp.zone";  #正向解析文件名
        allow-update { 192.168.10.101; };  #指定更新的主机地址
};

zone "10.168.192.in-addr.arpa" IN {
        type master;  #类型为主DNS
        file "10.zone";  #反向解析文件名
        allow-update { 192.168.10.101; };  #指定更新的主机地址
};
...
[root@linux1 ~]#

创建主DN正反向文件：

[root@linux1 ~]# cd /var/named/
[root@linux1 named]# ls
chroot  data  dynamic  dyndb-ldap  named.ca  named.empty  named.localhost  named.loopback  slaves

[root@linux1 named]# cp named.localhost cetrp.zone
[root@linux1 named]# cp named.localhost 10.zone

[root@linux1 named]# ls -l cetrp.zone 10.zone
-rw-r-----. 1 root  root   152 May  2 01:02 10.zone
-rw-r-----. 1 root  root   152 May  2 01:02 cetrp.zone

[root@linux1 named]# chown named cetrp.zone 10.zone
[root@linux1 named]# ls -l cetrp.zone 10.zone
-rw-r-----. 1 named root 152 May  2 01:02 10.zone
-rw-r-----. 1 named root 152 May  2 01:02 cetrp.zone
[root@linux1 named]#

主DNS正向解析文件配置：

[root@linux1 named]# vi cetrp.zone
$TTL 1D
@       IN SOA  ns.cetrp.com. root.cetrp.com. (
                                        0       ; serial  
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
@       NS      ns.cetrp.com.
ns      IN      A       192.168.10.100
www     IN      A       192.168.10.101
[root@linux1 named]#

主DNS反向向解析文件配置：

[root@linux1 named]# vi 10.zone
$TTL 1D
@       IN SOA  ns.cetrp.com. root.cetrp.com. (
                                        0       ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
@       NS      ns.cetrp.com.
100     IN      PTR     ns.cetrp.com.
101     IN      PTR     www.cetrp.com.
[root@linux1 named]#

启动主DNS服务：

[root@linux1 ~]# firewall-cmd --permanent --add-port=53/udp 
[root@linux1 ~]# firewall-cmd --permanent --add-port=53/tcp
[root@linux1 ~]# firewall-cmd --reload
[root@linux1 ~]# systemctl start named
[root@linux1 ~]# systemctl enable named

主DNS自测：

[root@linux1 ~]# vi /etc/resolv.conf
servername 192.168.10.100
servername 192.168.10.101
[root@linux1 ~]#


[root@linux1 ~]# nslookup ns.cetrp.com
Server:         127.0.0.1
Address:        127.0.0.1#53

Name:   ns.cetrp.com
Address: 192.168.10.100

[root@linux1 ~]# nslookup 192.168.10.100
100.10.168.192.in-addr.arpa     name = ns.cetrp.com.

[root@linux1 ~]#

从DNS配置：

编辑主DNS配置文件：

[root@linux2 ~]# cat /etc/named.conf
...
options {
        listen-on port 53 { 127.0.0.1; };  #改为any
        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     { localhost; };  #改为any

       ...
        recursion yes;

        dnssec-enable yes;
        dnssec-validation yes;

        /* Path to ISC DLV key */
        bindkeys-file "/etc/named.root.key";

        managed-keys-directory "/var/named/dynamic";

        pid-file "/run/named/named.pid";
        session-keyfile "/run/named/session.key";
        masterfile-format text;  #指定下载的解析文件格式(不指定会乱码)
        forwarders { 192.168.10.100; };  #全局转发主DNS 
};

...
include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";

[root@linux2 ~]#

编辑从DNS区域文件：

[root@linux2 ~]# vi /etc/named.rfc1912.zones
...
zone "cetrp.com" IN {
        type slave;  #从模式
        file "slaves/cetrp.zone"; #正向解析文件路径
        masters { 192.168.10.100; }; #主DNS地址
};

zone "10.168.192.in-addr.arpa" IN {
        type slave; #从模式
        file "slaves/10.zone"; #反向解析文件路径
        masters { 192.168.10.100; }; #主DNS地址
};

[root@linux2 ~]#

启动从DNS服务：

[root@linux1 ~]# firewall-cmd --permanent --add-port=53/udp 
[root@linux1 ~]# firewall-cmd --reload
[root@linux1 ~]# systemctl start named
[root@linux1 ~]# systemctl enable named

 从DNS自测

[root@linux1 ~]# vi /etc/resolv.conf
servername 192.168.10.100
servername 192.168.10.101
[root@linux1 ~]#

[root@linux2 ~]# ls /var/named/slaves/  #查看从DNS正反向文件
10.zone  cetrp.zone  #必须要有这两个文件(由主DNS下载而来)，只要配置文件正确能正常启动从DNS就会自动下载
[root@linux2 ~]#

[root@linux2 ~]# nslookup www.cetrp.com
Server:         127.0.0.1
Address:        127.0.0.1#53

Name:   www.cetrp.com
Address: 192.168.10.101

[root@linux2 ~]# nslookup 192.168.10.101
101.10.168.192.in-addr.arpa     name = www.cetrp.com.

[root@linux2 ~]#

测试：

配置网卡：

测验：