修改配置文件
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sudo vim /etc/dhcpcd.conf
增加如下内容，我们使用Google DNS（北京联通测试速度不错）
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static domain_name_servers = 8.8.8.8 8.8.4.4
完整的示例文件部分
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interface eth0
static ip_address = 192.168.1.3/24
static routers = 192.168.1.1
static domain_name_servers = 8.8.8.8 8.8.4.4
设置配置生效
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sudo service dhcpcd restart
验证是否生效
我们使用dig命令验证dns是否生效
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dig droidyue.com
; <<>> DiG 9.11.5-P4-5.1-Raspbian <<>> droidyue.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode : QUERY, status: NOERROR, id: 54841
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;droidyue.com. IN A
;; ANSWER SECTION:
droidyue.com. 299 IN A 104.27.129.205
droidyue.com. 299 IN A 104.27.128.205
;; Query time: 44 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sun Apr 19 17:07:11 CST 2020
;; MSG SIZE rcvd: 73
重点看这个信息
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;; Query time : 44 msec
;; SERVER: 8.8.8.8#53( 8.8.8.8)
;; WHEN: Sun Apr 19 17:07:11 CST 2020
;; MSG SIZE rcvd: 73
注意
不要直接修改这个文件/etc/resolv.conf
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# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 8.8.8.8
nameserver fe80::1%eth0
You have new mail in /var/mail/pi
正如上面英文说得，这个文件会被冲掉，未来某个时间你还需要重新设置。所以按照文章中的修改即可。
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