1 卸载Mysql
yum remove mysql mysql-server mysql-libs mysql-server;
find / -name mysql 将找到的相关东西delete掉；
rpm -qa|grep mysql(查询出来的东东yum remove掉)
2 安装mysql
CentOS 7的yum源中貌似没有正常安装mysql时的mysql-sever文件，需要去官网上下载
wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
rpm -ivh mysql-community-release-el7-5.noarch.rpm
yum install mysql-community-server
成功安装之后重启mysql服务
service mysqld restart
初次安装mysql是root账户是没有密码的
mysql -uroot; #登录mysql控制台
use mysql; #进入系统数据库
UPDATE user SET Password = password ('123456') WHERE User = 'root' ; #设置密码
grant all privileges on . to root@'%' identified by "123456"; #授权远程访问
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