Download MySQL 5.6.15 from http://dev.mysql.com/downloads/ 
shell> groupadd mysql //                                
shell> useradd -r -g mysql mysql //             
shell> cd /usr/local //                     
shell> tar zxvf /path/to/mysql-VERSION-OS.tar.gz //                       
shell> ln -s full-path-to-mysql-VERSION-OS mysql //
shell> cd mysql shell> chown -R mysql . //                                   
shell> chgrp -R mysql . //                                              
shell> scripts/mysql_install_db --user=mysql //                                         
shell> chown -R root . //                                                 
shell> chown -R mysql data //                                                                    
shell> bin/mysqld_safe --user=mysql & //                                       
# Next command is optional
shell> cp support-files/mysql.server /etc/init.d/mysql.server start Mysql
#/etc/init.d/mysql start  设置mysql的root 密码;注意设置密码的时候一定用password 函数。
# /etc/init.d/mysql stop
# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
# mysql -u root mysql
mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root';
mysql> FLUSH PRIVILEGES;
mysql> quit

	# /etc/init.d/mysql restart
# mysql -uroot -p
Enter password: <输入新设的密码newpassword>