1、安装 dnsmasq
# yum install -y dnsmasq
2、修改配置
# grep -v '^#' /etc/dnsmasq.conf |grep -v '^$'
resolv-file=/etc/resolv.dnsmasq.conf
strict-order
server=114.114.114.114
listen-address=172.20.72.7,127.0.0.1
addn-hosts=/etc/dnsmasq.hosts
cache-size=10240
bogus-nxdomain=114.114.114.114
log-queries
log-facility=/var/log/dnsmasq/dnsmasq.log
conf-dir=/etc/dnsmasq.d
conf-dir=/etc/dnsmasq.d,.bak
conf-dir=/etc/dnsmasq.d/,*.conf
conf-dir=/etc/dnsmasq.d,.rpmnew,.rpmsave,.rpmorig
3、创建日志目录，不然无法启动
# mkdir /var/log/dnsmasq/
4、修改 resolv-file
# vim /etc/resolv.dnsmasq.conf
nameserver 1.1.1.1
nameserver 114.114.114.114
nameserver 8.8.8.8
5、添加 hosts
# vim /etc/dnsmasq.hosts
123.206.16.61 www.psy.com
6、启动服务
# systemctl start dnsmasq
# systemctl enable dnsmasq
7、查看日志
# tailf /var/log/dnsmasq/dnsmasq.log
Jun 24 21:22:01 dnsmasq[4667]: started, version 2.76 cachesize 10000
Jun 24 21:22:01 dnsmasq[4667]: compile time options: IPv6 GNU-getopt DBus no-i18n IDN DHCP DHCPv6 no-Lua TFTP no-conntrack ipset auth no-DNSSEC loop-detect inotify
Jun 24 21:22:01 dnsmasq[4667]: using nameserver 114.114.114.114#53
Jun 24 21:22:01 dnsmasq[4667]: reading /etc/resolv.dnsmasq.conf
Jun 24 21:22:01 dnsmasq[4667]: using nameserver 114.114.114.114#53
Jun 24 21:22:01 dnsmasq[4667]: using nameserver 1.1.1.1#53
Jun 24 21:22:01 dnsmasq[4667]: using nameserver 114.114.114.114#53
Jun 24 21:22:01 dnsmasq[4667]: using nameserver 8.8.8.8#53
Jun 24 21:22:01 dnsmasq[4667]: read /etc/hosts - 2 addresses
Jun 24 21:22:01 dnsmasq[4667]: read /etc/dnsmasq.hosts - 1 addresses
8、找一台机器将 dns 指向 dnsmasq 服务器地址
# vim /etc/resolv.conf
nameserver 127.0.0.1
# nslookup
> www.psy.com
Server: 127.0.0.1
Address: 127.0.0.1#53
Name: www.psy.com
Address: 123.206.16.61
> www.baidu.com
Server: 114.114.114.114
Address: 114.114.114.114#53
Non-authoritative answer:
www.baidu.com canonical name = www.a.shifen.com.
Name: www.a.shifen.com
Address: 61.135.169.121
Name: www.a.shifen.com
Address: 61.135.169.125
参考：
https://hub.docker.com/r/jpillora/dnsmasq
https://www.jianshu.com/p/00254204e021
https://www.cnblogs.com/imp-W/p/12895859.html
https://shanyue.tech/op/dnsmasq.html
https://www.cnblogs.com/taoyuxuan/p/11205491.html
https://blog.csdn.net/weixin_34248258/article/details/92926584
https://public-dns.info/