Centos7.x系统优化

1、安装常用软件

yum install tree nmap sysstat lrzsz dos2unix wget  net-tools ntpdate -y

2、配置yum源

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

3、时间同步

*/60 * * * *  ntpdate cn.pool.ntp.org >/dev/null 2>&1

4、关闭防火墙和selinux

#firewalld

systemctl stop firewalld.service

systemctl disable firewalld.service

#close selinux

sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
setenforce 0