NetworkManager 是CentOS 7 下的网络配置工具
如果遇到提示NetworkManager is not running的错误提示，那么需要安装一下该服务。
之前在CentOS 6下编辑网卡，直接使用setup工具就可以了。 但在新版的CentOS 7里，setuptool已经没有网络编辑组件了，取而代之的是NetworkManager Text User Interface，即nmtui。
nmtui默认随系统标准安装，如果你使用最小化安装，可能没有该软件，使用下面的命令手动安装：
yum install NetworkManager-tui
在命令行运行 nmtui：
nmtui
如果提示NetworkManager is not running，需要手动启动NetworkManager：
systemctl start NetworkManager
再次运行 nmtui,即可看到网络编辑界面了，这里可以编辑连接、激活新网络连接和设置主机名字，根据实际需要选择即可
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