一、臨時設置

直接修改 /etc/resolv.conf，例如直接添加nameserver 8.8.8.8。

注意：系統重啟或resolvconf重啟后會刷新該配置文件。

二、 永久配置

/etc/resolv.conf是一個鏈接，指向/run/resolvconf/resolv.conf，/run/resolvconf/resolv.conf的內容是由/etc/resolvconf/resolv.conf.d/base加載過去的。

參考：

①Ubuntu通過修改配置文件進行網絡配置及ubuntu解決resolv.conf被重寫問題和NetworkManager的關系；

②Debian DNS resolv.conf 重啟失效/復寫；

# 進入/etc/resolvconf/resolv.conf.d/文件夾

cd /etc/resolvconf/resolv.conf.d/

# 添加nameserver，也可以修改head或tail

vi /etc/resolvconf/resolv.conf.d/base

nameserver 8.8.8.8

# 刷新或重啟

sudo resolvconf -u

sudo systemctl restart resolvconf

注：/etc/resolvconf/run/resolv.conf似乎也是指向/run/resolvconf/resolv.conf的鏈接，并且/etc/resolvconf/run/interface/systemd-resolved文件也會同時添加到/run/resolvconf/resolv.conf中，如果有大佬知道可以指點一下。

# 進入/etc/resolvconf/run/interface/文件夾

cd /etc/resolvconf/run/interface/

# 添加nameserver

vi /etc/resolvconf/run/interface/systemd-resolved

nameserver 8.8.8.8

# 刷新或重啟

sudo resolvconf -u

sudo systemctl restart resolvconf