搭建本地 DNS 缓存的好处有很多:
- 加快 DNS 解析速度
- 防止 DNS 污染
- 屏蔽某些网站
安装 Dnsmasq
Arch Linux
sudo pacman -S dnsmasq
Debian
sudo apt-get install dnsmasq
配置 Dnsmasq
编辑/etc/dnsmasq.conf:
no-resolv
no-hosts
cache-size=2048
server=8.8.8.8
serve=114.114.114.114
启动服务
Arch Linux
sudo systemctl enable dnsmasq.service
sudo systemctl start dnsmasq.service
Debian
sudo service dnsmasq start
测试 Dnsmasq
用下面的命令测试 Dnsmasq 是否正常工作
dig @localhost www.google.com
正常的话应有类似下面的输出
; <<>> DiG 9.9.2-P2 <<>> @localhost www.google.com
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29369
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 4, ADDITIONAL: 5
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 51 IN A 173.194.127.113
www.google.com. 51 IN A 173.194.127.116
www.google.com. 51 IN A 173.194.127.114
www.google.com. 51 IN A 173.194.127.115
www.google.com. 51 IN A 173.194.127.112
;; AUTHORITY SECTION:
google.com. 544 IN NS ns1.google.com.
google.com. 544 IN NS ns3.google.com.
google.com. 544 IN NS ns4.google.com.
google.com. 544 IN NS ns2.google.com.
;; ADDITIONAL SECTION:
ns1.google.com. 578 IN A 216.239.32.10
ns2.google.com. 578 IN A 216.239.34.10
ns3.google.com. 578 IN A 216.239.36.10
ns4.google.com. 578 IN A 216.239.38.10
;; Query time: 1 msec
;; SERVER: ::1#53(::1)
;; WHEN: Sat May 24 20:48:11 2014
;; MSG SIZE rcvd: 259
修改系统默认 DNS 服务器
Arch Linux
编辑 /etc/resolvconf.conf：
name_servers=127.0.0.1
Debian
编辑/etc/resolv.conf：
nameserver 127.0.0.1
