我正在配置一台fedora 21服务器，我已经基于以下链接设置了静态ip和dns
我正在使用编辑文件
vi /etc/resolv.conf
然后像上面提到的那样放我的dns。一切都很好。但在我重新启动后，文件被其原始内容改写了：
# No nameservers found; try putting DNS servers into your
# ifcfg files in /etc/sysconfig/network-scripts like so:
#
# DNS1=xxx.xxx.xxx.xxx
# DNS2=xxx.xxx.xxx.xxx
# DOMAIN=lab.foo.com bar.foo.com
发生了什么，如何阻止这种情况的发生？
NetworkManager正在覆盖它。您可以关闭它并进入"手动"模式，那里有一些教程：http://xmodulo.com/disable-network-manager-linux.html
在fedora 26下，man NetworkManager.conf，上面写着：
rc-manager
Set the resolv.conf management mode. The default value depends on NetworkManager build options, and this version of NetworkManager was build with a default of "symlink". Regardless of this
setting, NetworkManager will always write resolv.conf to its runtime state directory /var/run/NetworkManager/resolv.conf.
symlink: If /etc/resolv.conf is a regular file, NetworkManager will replace the file on update. If /etc/resolv.conf is instead a symlink, NetworkManager will leave it alone. Unless the symlink
points to the internal file /var/run/NetworkManager/resolv.conf, in which case the symlink will be updated to emit an inotify notification. This allows the user to conveniently instruct
NetworkManager not to manage /etc/resolv.conf by replacing it with a symlink.
file: NetworkManager will write /etc/resolv.conf as file. If it finds a symlink, it will follow the symlink and update the target instead.
resolvconf: NetworkManager will run resolvconf to update the DNS configuration.
netconfig: NetworkManager will run netconfig to update the DNS configuration.
unmanaged: don't touch /etc/resolv.conf.
none: deprecated alias for symlink.
似乎没有必要更改任何配置文件。
我只是在那里放了一个符号链接，它就起作用了。
使用以下命令防止resolv.conf或任何文件在重新启动后被覆盖
chattr -V +i filename
例如：chattr -V +i /etc/resolv.conf
要恢复更改，请使用以下命令：
chattr -i filename-重新启用插入文件
chattr（更改属性）是一个命令行Linux实用程序，用于在Linux系统中设置/取消设置文件的某些属性，以确保意外删除或修改重要文件和文件夹，即使您是以root用户身份登录。