1. GPG 密钥

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

2.防火墙

systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
firewall-cmd --state #查看默认防火墙状态（关闭后显示notrunning，开启后显示running）

3.安装nginx

rpm -ivh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm 

yum install -y nginx

4.安装mysql

rpm -ivh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm

yum install -y mysql-community-server

centos7注意事项