GCP 总是自动换 DNS

请自己 google resolvconf

看后台是不是跑着 google 的程序？是就试试 kill 了

求歪门邪道秘笈

iptables 重定向喽

1. 将 resolve.conf 设置成只读
2. 找网卡的配置文件，里面应该有一项 autoconfig，屏蔽掉

另外 aws 和 azure 也是一样的，目的就是让虚拟机默认走内网的 dns。

极大概率是 DHCP client 搞的，不会记错的……

我在 AWS 上被坑过，改了当时是生效了，结果过了个不定期的时间，又给还原回去了，业务就 down 了

看了系统日志发现是 DHCP 给弄的…

你的这个只读对 root 用户无效，需要 chattr 加上 i 权限

root@instance-1:~# 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.

代理软件的配置文件内可以指定 dns 的吧，不一定非要修改系统 dns

这里提到了很多种方法，任君选择

https://www.cyberciti.biz/faq/dhclient-etcresolvconf-hooks/

LZ 求歪门邪道秘笈. 謝謝🙏

你要 chattr 加上 i 权限 chattr +i /etc/resolv.conf
求歪门邪道秘笈. 謝謝🙏

修改 /etc/sysconfig/network/config 文件，将 NETCONFIG_DNS_POLICY='auto'这句改为 NETCONFIG_DNS_POLICY=''