Пример настройки DNS сервера

mcedit /etc/dnsmasq.d/local.conf

port=53
# Disable resolv.conf
no-resolv
# Upstream DNS servers
server=8.8.8.8
server=1.1.1.1
#A-records
address=/mail.example.local/192.168.150.105
#CNAME-records
cname=mx.example.local,mail.example.local
#MX-records
mx-host=example.local,mail.example.local,10
#Добавлять домен к простым именам
expand-hosts
domain=example.local
#Выдать вместо IP адреса 89.89.89.89 - IP адрес 192.168.150.4
#если upstream DNS выдал 89.89.89.89 на DNS запрос
alias=89.89.89.89,192.168.150.4

cat /etc/dnsmasq.conf | grep conf-dir

#conf-dir=/etc/dnsmasq.d
#conf-dir=/etc/dnsmasq.d,.bak
#conf-dir=/etc/dnsmasq.d/,*.conf
conf-dir=/etc/dnsmasq.d/,*.conf
#conf-dir=/etc/dnsmasq.d,.rpmnew,.rpmsave,.rpmorig

systemctl restart dnsmasq