1，CentOS 7的yum源中沒有正常安裝mysql-sever文件
2，官方下載：wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
3，加入安裝庫：rpm -ivh mysql-community-release-el7-5.noarch.rpm
4，安裝：yum install mysql-community-server
5，啓動 service mysqld restart
6，初次安裝mysql是root賬戶沒有密碼
7，設置密碼mysql -uroot
set password for ‘root’@‘localhost’ = password('mypasswd');