Ubuntu修改DNS永久生效

1）禁用systemd-resolved服务

systemctl stop systemd-resolved
systemctl disable systemd-resolved

2）默认的/etc/resolv.conf是软链接，删除重建为普通文件。

rm -rf /etc/resolv.conf

3）vim /etc/resolv.conf

nameserver 10.1.1.1
nameserver 10.1.2.1

4）将/etc/resolv.conf文件加锁

chattr +i /etc/resolv.conf

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