阿里广州和深圳的 ecs 内网 dns server 解析不到境外域名
# cat /etc/resolv.conf
# 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 100.100.2.136
nameserver 100.100.2.138
nameserver 223.5.5.5
nameserver 223.6.6.6
# dig
xxx.com;; Query time: 4 msec
;; SERVER: 223.5.5.5#53(223.5.5.5)
;; WHEN: Wed Jan 12 01:15:18 CST 2022
;; MSG SIZE rcvd: 54
100 是内网 dns server
223 是阿里的公共 dns server