a.下载包
打开 https://dev.mysql.com/downloads/repo/yum/ 选择对应版本
点击下一download 后，复制 No thanks, just start my download. 上的连接
下载：
wget https://dev.mysql.com/get/mysql57-community-release-el6-9.noarch.rpm
b.安装用来配置mysql的yum源的rpm包
rpm -Uvh mysql57-community-release-el6-9.noarch.rpm
或
yum localinstall -y mysql57-community-release-el6-9.noarch.rpm
安装成功后在/etc/yum.repos.d/
2.安装mysql
yum install mysql-community-server
3.开启mysql服务
service mysqld start
4.默认密码
启动后创建的超级用户'root'@'localhost' 密码被存储在/var/log/mysqld.log
命令查看密码
grep 'password' /var/log/mysqld.log
使用mysql生成的'root'@'localhost'用户和密码登录数据库，并修改默认密码
shell> mysql -uroot -p
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'newpassword';