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
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初次安装mysql是root账户是没有密码的
设置密码的方法
# mysql -urootmysql> set password for ‘root’@‘localhost’ = password(‘mypasswd‘);mysql> exitsystemctl start mariadb #启动MariaDB
systemctl stop mariadb #停止MariaDB
systemctl restart mariadb #重启MariaDB
systemctl enable mariadb #设置开机启动
原文：http://www.cnblogs.com/chen110xi/p/4787575.html