1.安装OEL7.2 64bit版，创建用户bdd

2.各个主机之间建立互信，无密码登陆

3.找一个主机安装mysql

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

sudo yum -y install mysql-community-server

sudo /usr/bin/systemctl enable mysqld   启动时自动启动

sudo /usr/bin/systemctl start mysqld

sudo /usr/bin/mysql_secure_installation  设置root密码等，需要mysql启动