A.安装bind bind-utils

yum -y install bind bind-utils

or

dnf install bind bind-utils -y

B.修改named.conf配置文件

vim /etc/named.con\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

options{
	listen-on port 53 {192.168.122.1;};
	directory"/var/named";
	allow-query{any;};
};

zone	"uos.com"	IN {
	type	master;
	file	"uos.com.db";
};

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

C.生成并修改uos.com.db 文件

1.复制模版文件named.localhost 到文件uos.com.db

cd /var/named
cp -p named.localhost uos.com.db

2.修改uos.com.db文件

vi uos.com.db

修改为

$TTL 1D
@       IN SOA  ns.uos.com root.nos.uos.com. (
                                        0       ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
        IN      NS      ns.uos.com.
ns      IN      A       192.168.122.1
www     IN      A       192.168.122.1
admin   IN      A       192.168.122.1
oa		IN      A       192.168.122.1

如图：

D.重启named服务

systemctl restart named

E.配置DNS服务器

 vi /etc/resolv.conf

内容如下

nameserver 192.168.122.1
nameserver 114.114.114.114

F.测试DNS服务器

nslookup ns.uos.com server1
nslookup www.uos.com server1
nslookup oa.uos.com server1
nslookup admin.uos.com server1