dnsmasq

# [dnsmasq](https://thekelleys.org.uk/dnsmasq/ "dnsmasq")

[配置教程](https://cloud.tencent.com/developer/article/1174717)

一个轻量的pxe、tftp、dhcp和dns服务端，适用于小型网络(终端数<50)，可以加速dns缓存或劫持dns起到免广告，解析内网域名等作用。

## 安装
```shell
yum -y install dnsmasq
# 如果要使用dncp功能还需要dhcp数据库
yum -y install dnsmasq-utils
# 开机自启动
systemctl enable dnsmasq
# 启动服务
systemctl start dnsmasq
# 检查是否启动成功
nslookup qq.com 127.0.0.1
# 修改系统默认dns
cat /etc/resolv.conf >> /etc/dnsmasq.resolv
cat >> /etc/dnsmasq.conf <<\EOF
resolv-file=/etc/dnsmasq.d/resolv.conf
EOF

cat >> /etc/resolv.conf <<\EOF
nameserver 127.0.0.1
EOF
```

## 基本配置
- 自定义host，类似修改本地host

```
cat >> /etc/dnsmasq.conf <<\EOF
addn-hosts=/etc/dnsmasq.hosts
EOF

cat /etc/dnsmasq.hosts
127.0.0.1 my.test.com

nslookup my.test.com 127.0.0.1
Server:         127.0.0.1
Address:        127.0.0.1#53

Name:   my.test.com
Address: 127.0.0.1
```

- 使用特定dns服务器解析特定域名

```
# 指定域名与dns可能会包含很多条记录建议分开配置文件
cat >> /etc/dnsmasq.d/servers.conf <<\EOF
server=/google.com/8.8.8.8
EOF

# 对比下下面三条命令的结果，本地是否与8.8.8.8相同
nslookup www.google.com 114.114.114.114
nslookup www.google.com 127.0.0.1
nslookup www.google.com 8.8.8.8
```