序
本文主要记录一下nginx的host not found异常
背景
某个内部域名，在A,B机器都可以，但是在C机器解析不了，nginx启动报错
nginx: [emerg] host not found in upstream "demo.com.cn" in /usr/local/openresty/nginx/conf/nginx.conf:95
resolver
怎么办了，这下nginx的resolver指定就派上用场了。在A,B机器上查看他们的dns
➜ ~ 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 192.168.100.1
配置nginx dns
location /fix-dns {
resolver 192.168.100.1 valid=300s;
set $demohost demo.com.cn;
proxy_pass http://$demohost/api/xxx ;
}
当然也可以根据情况将resolver放在server模块底下。
