Ubuntu修改DNS重啟丟失問題

Ubuntu 15.04直接修改/etc/resolv.conf，添加DNS重啟後配置丟失。

正確方法：

1. #vim /etc/network/interfaces，文件最後添加“dns-nameservers 223.5.5.5”

   重啟systemctl restart networking.service，測試OK

2. #vim /etc/resolvconf/resolv.conf.d/base（文件默認為空）

   nameserver 223.5.5.5

   nameserver 223.6.6.6

   #resolvconf -u (更新改動至resolv.conf)

   #more /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 223.5.5.5

   nameserver 223.6.6.6

   不需要重啟網卡/系統，測試OK，重啟系統後OK。

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