centos7最小化安装好系统后初始化安装基本工具和系统设定（不定期更新）
直接复制粘贴即可。
yum install -y wget ntp curl vim net-tools
tar -zcvf /etc/yum.repos.d/yumRepo.bak /etc/yum.repos.d/*.repo
rm -rf /etc/yum.repos.d/*.repo
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum install epel-release -y
yum clean all && yum makecache
timedatectl set-timezone Asia/Shanghai
timedatectl set-local-rtc 0
sed -i 's/server 0.centos.pool.ntp.org iburst/server ntp1.aliyun.com iburst/g' /etc/ntp.conf
sed -i 's/server 1.centos.pool.ntp.org iburst/server ntp2.aliyun.com iburst/g' /etc/ntp.conf
sed -i 's/server 2.centos.pool.ntp.org iburst/server 1.centos.pool.ntp.org iburst/g' /etc/ntp.conf
sed -i 's/server 3.centos.pool.ntp.org iburst/server 2.centos.pool.ntp.org iburst/g' /etc/ntp.conf
systemctl restart ntpd
systemctl enable ntpd
systemctl stop firwalld
systemctl disable firewalld
setenforce 0
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
在下菜的很，有不对的地方欢迎指正