安装BIND组件，开启DNS服务，检查状态
yum install bind bind-utils
systemctl start named
systemctl enable named
systemctl status named开启DNS服务请求通过防火墙
systemctl start firewalld.service
firewall-cmd --permanent --add-service=dns
firewall-cmd --reload
firewall-cmd --list-all编辑网卡配置文件，将DNS1服务器指向本机IPADDR实际IP
vim /etc/sysconfig/network-scripts/ifcfg-ens192 
重启网卡
systemctl restart network编辑主配置文件named.conf
vim /etc/named.conf
保存退出后，刷新配置
vim /etc/named.conf
systemctl reload named
systemctl restart named
rndc flush //刷新本地缓存