dns实现主服务器

1.要求

需要 3 台 Linux 服务器，如下表所示。

2.实现步骤

1.修改ip和主机名
web:

hostnamectl hostname web
nmcli c modify ens160 ipv4.method manual ipv4.addresses 192.168.72.8/24 ipv4.gateway 192.168.72.2 ipv4.dns 223.5.5.5 connection.autoconnect yes
nmcli c up ens160

dns-server:

hostnamectl hostname dns-server
nmcli c modify ens160 ipv4.method manual ipv4.addresses 192.168.72.18/24 ipv4.gateway 192.168.72.2 ipv4.dns 223.5.5.5 connection.autoconnect yes
nmcli c up ens160

client:

hostnamectl hostname client
nmcli c modify ens160 ipv4.method manual ipv4.addresses 192.168.72.7/24 ipv4.gateway 192.168.72.2 ipv4.dns 192.168.72.18 connection.autoconnect yes
nmcli c up ens160

2.安装服务
配置仓库(所有虚拟机)

[BaseOS]
name=BaseOS
baseurl=/mnt/BaseOS
gpgcheck=0
[AppStream]
name=AppStream
baseurl=/mnt/AppStream
gpgcheck=0

挂载(所有虚拟机)

mount /dev/sr0 /mnt

web:

dnf install nginx -y

dns-server:

dnf install bind -y

关闭selinux(所有虚拟机)

setenforce 0

3.web端相关配置

编写欢迎页面

echo "welcome to nginx" > /usr/share/nginx/html/index.html

放行服务

firewall-cmd --permanent --add-service=http
firewall-cmd --reload

启动nginx服务

systemctl enable nginx --now

4.dns相关配置

修改主配置文件

vim /etc/bind/naemd.conf

options {
	listen-on port 53 {192.168.72.18; };
	directory				"/var/named";
};
zone "example.com" IN {
		type master;
		file "example.com";
};

编写区域配置文件

vim /var/named/example.com

$TTL 1D
@		IN 			SOA				ns.example.com.
admin.example.com.	(
									0
									1D
									1H
									1W
									1D)
		IN				NS			na.example.com.
ns		IN				A			192.168.72.18
www		IN				A			192.168.72.18									
									

放行服务

firewall-cmd --permanent --add-service=dns
firewall-cmd --reload

开启dns相关服务

systemctl enable nsmed --now 		

测试域名解析

dig -t NS example.com @192.168.72.18

5.客户端测试

nmcli c show | grep DNS
curl www.example.com
curl 192.168.72.8