拉取・克隆代码时提示Could not resolve host: [github.com]

sudo git pull
fatal: unable to access 'https://github.com/hst-bridge/AmazonRanking.git/': Could not resolve host: github.com

dig github.com・ping github.com

如果第三步没有返回结果,那应该时域名没有解析出来

azureuser@prod-vm-ranking:~/AmazonRanking$ dig github.com

#第一部分是综述，说明此次命令一共查询了几次，有几个回答。
; <<>> DiG 9.10.6 <<>> github.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7758
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 8, ADDITIONAL: 15

#第二部分是 QUESTION SECTION，即说明此命令发送了什么样的指令。
#这里表示我们询问 github.com 域名的 A 记录。
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;github.com.			IN	A

#第三部分是 ANSWER SECTION，即说明此命令执行后返回的结果。
#这里的结果表明 github.com 域名的 A 记录指向了 13.114.40.48 这个 IP。
;; ANSWER SECTION:
github.com.		5	IN	A	13.114.40.48

;; AUTHORITY SECTION:
github.com.		65597	IN	NS	dns4.p08.nsone.net.
github.com.		65597	IN	NS	ns-1283.awsdns-32.org.
github.com.		65597	IN	NS	ns-421.awsdns-52.com.
github.com.		65597	IN	NS	dns3.p08.nsone.net.
github.com.		65597	IN	NS	ns-1707.awsdns-21.co.uk.
github.com.		65597	IN	NS	ns-520.awsdns-01.net.
github.com.		65597	IN	NS	dns1.p08.nsone.net.
github.com.		65597	IN	NS	dns2.p08.nsone.net.

;; ADDITIonAL SECTION:
dns1.p08.nsone.net.	70078	IN	AAAA	2620:4d:4000:6259:7:8:0:1
dns2.p08.nsone.net.	69725	IN	AAAA	2a00:edc0:6259:7:8::2
dns3.p08.nsone.net.	45603	IN	AAAA	2620:4d:4000:6259:7:8:0:3
dns4.p08.nsone.net.	45554	IN	AAAA	2a00:edc0:6259:7:8::4
ns-421.awsdns-52.com.	90285	IN	AAAA	2600:9000:5301:a500::1
ns-520.awsdns-01.net.	90286	IN	AAAA	2600:9000:5302:800::1
ns-1283.awsdns-32.org.	90286	IN	AAAA	2600:9000:5305:300::1
dns1.p08.nsone.net.	70078	IN	A	198.51.44.8
dns2.p08.nsone.net.	69725	IN	A	198.51.45.8
dns3.p08.nsone.net.	45603	IN	A	198.51.44.72
dns4.p08.nsone.net.	133594	IN	A	198.51.45.72
ns-421.awsdns-52.com.	90285	IN	A	205.251.193.165
ns-520.awsdns-01.net.	90286	IN	A	205.251.194.8
ns-1283.awsdns-32.org.	90286	IN	A	205.251.197.3

#第四部分是总结，即说明此次查询的一些信息，
#例如：查询耗时，本地DNS地址，查询时间，返回消息包大小。
;; Query time: 6 msec
;; SERVER: 2400:2410:8da2:5500:1111:1111:1111:1111#53(2400:2410:8da2:5500:1111:1111:1111:1111)
;; WHEN: Sat Aug 21 01:16:05 JST 2021
;; MSG SIZE  rcvd: 586

azureuser@prod-vm-ranking:~/AmazonRanking$ ping github.com
ping: github.com: Temporary failure in name resolution
azureuser@prod-vm-ranking:~/AmazonRanking$

dig github.com @114.114.114.114

这个命令可以指定DNS服务器

cat /etc/resolv.conf ⇒ nameserver 114.114.114.114

如果通过上面dig命令没有指定DNS服务器成功的话,可以直接 在/etc/resolv.conf 文件中追加DNS服务器地址,指定好DNS服务器地址之后再重新操作git.

azureuser@prod-vm-ranking:~/AmazonRanking$ cat /etc/resolv.conf
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# This is a dynamic resolv.conf file for connecting local clients to the
# internal DNS stub resolver of systemd-resolved. This file lists all
# configured search domains.
#
# Run "systemd-resolve --status" to see details about the uplink DNS servers
# currently in use.
#
# Third party programs must not access this file directly, but only through the
# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
# replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.

nameserver 127.0.0.53
nameserver 114.114.114.114
options edns0