利用 yum 安装 mysql， 并修改密码
yum install mysql
yum install mysql-server
yum install mysql-devel
chgrp -R mysql /var/lib/mysql
chmod -R 770 /var/lib/mysql
service mysqld start
mysql
SET PASSWORD FOR 'root'@'localhost' = PASSWORD('secret_password');

登陆：
[root]:mysql -uroot -p
Enter password: