为了准备RHCE考试，我把一台i7-2600k、16G内存、120Gssd的闲置主机刷成了CentOS7.下面是具体环境搭建的细节。
首先是系统的准备工作
su
yum update -y
yum install -y epel-release
yum makecache
yum install -y bash-completion network-tool sysfsutils
yum install -y htop vim ctags curl wget mlocate lftp
curl https://raw.githubusercontent.com/wklken/vim-for-server/master/vimrc > ~/.vimrc
配置虚拟化环境
#安装kvm
yum -y install qemu-kvm libvirt virt-install bridge-utils
yum -y install libguestfs-tools virt-top
#启动虚拟化管理服务
systemctl start libvirtd
systemctl enable libvirtd
#开启kvm嵌套
echo "options kvm-intel nested=1" >> /etc/modprobe.d/kvm-intel.conf
#重新加载kvm模块
modprobe -r kvm_intel
modprobe kvm_intel
#关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
#关闭selinux
vi /etc/selinux/config
>SELINUX=disabled
reboot