在VirtualBox里安装CentOS系统，会遇到增强工具无法正常安装，[Building the main Guest Additions module]主要的原因是出在Kernal 库找不到。

安装 gcc g++ 编译器,安装内核Kernal库

• yum install gcc-g++
• yum install kernel

重启,再安装.还不行. 继续执行

• yum install kernel-devel

还不行

• yum update kernel

===================== vi /etc/sysconfig/network

===================================== 如果是centos7没这问题. 虚拟机装了之后,第一次启动 Initial setup of CentOS Linux 7 (core)

1. [x] Creat user 2) [!] License information (no user will be created) (license not accepted) Please make your choice from above ['q' to quit | 'c' to continue | 'r' to refresh]: 解决方法： 输入“1”，按Enter键 输入“2”，按Enter键 输入“q"，按Enter键 输入“yes”，按Enter键