Debian/centos系统

改dns并设置为只读

echo -e "nameserver 4.4.4.4（以实际为准）" > /etc/resolv.conf

chattr +i /etc/resolv.conf

取消只读并还原回谷歌dns

chattr -i /etc/resolv.conf

echo -e "nameserver 8.8.8.8" > /etc/resolv.conf

ubuntu系统

修改DNS
vi /etc/systemd/resolved.conf
输入
DNS=4.4.4.4（以实际为准）

:wq保存后

systemctl daemon-reload
systemctl restart systemd-resolved.service
mv /etc/resolv.conf /etc/resolv.conf.bak
ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf

移除并还原为谷歌DNS

修改DNS
vi /etc/systemd/resolved.conf
输入
DNS=8.8.8.8
DNS=1.1.1.1

:wq保存后

systemctl daemon-reload
systemctl restart systemd-resolved.service
mv /etc/resolv.conf /etc/resolv.conf.bak
ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf