[转]ubuntu linux下DNS重启后丢失(不是Network-manager造成的情况)

• 从网上得知 /etc/resolv.conf中的DNS配置是从/etc/resolvconf/resolv.conf.d/head中加载而来,所以每回改resolv.conf都会失效，在此文件里面已经有说明

打开/etc/resolv.conf内容如下：cat /etc/resolv.conf

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

内容是一段警告：说这个文件是resolvconf程序动态创建的，不要直接手动编辑，修改将被覆盖。所以我们不能直接修改这个文件了

• 查资料得到两种方法：

方法1：

sudo vim /etc/network/interfaces
dns-nameservers 8.8.8.8

方法2：（这个文件默认是空的）

sudo vim /etc/resolvconf/resolv.conf.d/base
nameserver 8.8.8.8
nameserver 8.8.4.4

如果有多个DNS就一行一个

修改好保存，然后执行

resolvconf -u

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

• 再看/etc/resolv.conf，最下面就多了2行

cat /etc/resolv.conf

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

nameserver 8.8.8.8
nameserver 8.8.4.4

现在此DNS已经生效了，无需重启，当然重启也不会丢失

此外还有一种方法是修改/etc/resolvconf/resolv.conf.d/headsudo vim /etc/resolvconf/resolv.conf.d/head

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

这个文件里提示不要手动修改。。。按照系统提示的说法，不建议改此文件