使用以下命令安装MySql
sudo yum update
yum install wget
wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm
yum update
sudo yum install mysql-server
sudo systemctl start mysqld
初始化MySql：
sudo mysql_secure_installation