查看当前操作系统

sudo cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
NAME="Debian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

安装resolvconf服务

sudo apt install resolvconf
sudo systemctl start resolvconf.service
sudo systemctl enable resolvconf.service
sudo systemctl status resolvconf.service

设置DNS

sudo vim /etc/resolvconf/resolv.conf.d/head

将以下内容写入文件

# 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
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "resolvectl status" to see details about the actual nameservers.
nameserver 1.0.0.1
nameserver 1.1.1.1
nameserver 8.8.8.8
nameserver 8.8.4.4

更新resolv.conf

sudo resolvconf -u

更新时如果出现/etc/resolvconf/update.d/libc: Warning: /etc/resolv.conf is not a symbolic link to /run/resolvconf/resolv.conf这个错误，则运行sudo dpkg-reconfigure resolvconf修复一下

检查是否生效

sudo cat /etc/resolv.conf