DNSmasq是一個小巧且方便地用於配置DNS和DHCP的工具，適用於小型網路，它提供了DNS功能和可選擇的DHCP功能。它服務那些只在本地適用的域名，這些域名是不會在全球的DNS伺服器中出現的（摘自百度百科）

環境：Centos7

一、服務端配置

1.使用yum安裝dnsmasq

yum install dnsmasq

2.配置/etc/dnsmasq.conf

可以配置得很簡單，只需要配置監聽的IP和配置檔案路徑即可
listen-address=127.0.0.1,192.168.233.132
conf-dir=/etc/dnsmasq.d

3.配置對映檔案

在/etc/dnsmasq.d目錄下建立IP域名對映檔案，檔名可以隨意取，且可以多個，如：

[[email protected] /etc/dnsmasq.d] $ cat address.conf 
address=/redis/192.168.233.128
address=/mongodb/192.168.233.132

4.啟動服務

systemctl start dnsmasq

5.防火牆中開通DNS服務埠

firewall-cmd --permanent --add-port=53/tcp
firewall-cmd --permanent --add-port=53/udp
firewall-cmd --reload

二、客戶端配置

客戶端只需要在/etc/resolv.conf中配置DNS服務地址就好了，如：

nameserver 192.168.233.132

測試

按照上面的配置後，客戶端就可以解析DNS服務端配置的域名了

[[email protected] /] $ping redis
PING redis (192.168.233.128) 56(84) bytes of data.
64 bytes from fl (192.168.233.128): icmp_seq=1 ttl=64 time=0.017 ms
64 bytes from fl (192.168.233.128): icmp_seq=2 ttl=64 time=0.076 ms
64 bytes from fl (
 
192.168.233.128): icmp_seq=3 ttl=64 time=0.090 ms
^C
--- redis ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 11016ms
rtt min/avg/max/mdev = 0.017/0.061/0.090/0.031 ms
[[email protected] /] $ping mongodb
PING mongodb (192.168.233.132) 56(84) bytes of data.
64 bytes from fl (192.168.233.132): icmp_seq=1 ttl=64 time=0.228 ms
64 bytes from fl (192.168.233.132): icmp_seq=2 ttl=64 time=0.977 ms
^C
--- mongodb ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 0.228/0.602/0.977/0.375 ms